DRM from CBC (9800 kHz from Sackville) [Archive] - Page 2

VE3MEO

08-09-2004, 01:22

Similar observation here, too, Carl, except the deep, long fade lasted for 30 minutes starting at 23:15. Your fade is from 22:05-22:45 for 40 minutes and then you have solid signal through my fade. I didn't start logging until after your fade finished. It also seems like an absorptive cloud moved northwards through the Sackville-Richmond path then on through the Sackville-Toronto path.

Interesting to compare the depths of DRM SNR fades. Either your receiving system does better at lower carrier-noise ratio or you didn't experience as deep a fade.

73, Tom

dk8cb

08-09-2004, 01:32

Originally posted by chemclouds
Been raining here today with mild thunder storms.

Hi chemclouds,

I hope you have already grounded the loop properly for lightning protection!
I wonder a bit why you have already put the loop up in the open, it should work quite as well inside the house, which would make retuning and directing it a lot easier.

Expect much lower signal strengths when mounting the loop horizontally! But I still hope that you will be able to obtain a better signal to interference ratio.

roland

chemclouds

08-09-2004, 01:32

Hi Tom,
Thanks for that report. I did not realize that drop was for around 40 minutes. I was doing studies on loops. You mentioned "It also seems like an absorptive cloud moved northwards through the Sackville-Richmond path then on through the Sackville-Toronto path." Tom, maybe it was a, see my user name.
Carl

VE3MEO

08-09-2004, 01:59

Originally posted by chemclouds
Hi Tom,
Thanks for that report. I did not realize that drop was for around 40 minutes. I was doing studies on loops. You mentioned "It also seems like an absorptive cloud moved northwards through the Sackville-Richmond path then on through the Sackville-Toronto path." Tom, maybe it was a, see my user name.
Carl

Aha! explains everything. The intensity of your thinking caused an ESP cloud to stream out of Richmond in my direction, taking about an hour or so to get here. Only trouble is that I have very poor ESP sensitivity so only detected the side effect - the fade on 9800.

Tom

chemclouds

08-09-2004, 02:14

Tom,
My user name is more than just that. You were so close I couldn`t allow you turn back. Yes!! The sudden fade on 9800. Excellent comment from you.

Carl

chemclouds

08-09-2004, 02:55

00:59 TO 01:58

Tom,
Look at this report. Similar to the one for 9800. The report is on the following reply.
Carl

chemclouds

08-09-2004, 02:57

Forgot the report.
Here we go.
Carl

VE3MEO

08-09-2004, 02:59

Only 0.9% below target over entire logging period. No audio modulation until 01:00 and then a clipped start. 99.4% successful decoding over the duration of the program - just 0.5% below target.

Tom

chemclouds

08-09-2004, 02:59

Tom.
Go to page 17 and read my reply.
Carl

VE3MEO

08-09-2004, 03:04

Originally posted by chemclouds
00:59 TO 01:58

Tom,
Look at this report. Similar to the one for 9800.
Carl

That was my ESP cloud reply to you that caused your fade. However, I can't account for why it did not fade mine. Oh! I forgot the ESP propagation speed. I sent it an hour earlier, outside my 6140 logging period. Carl, we'll have to stop this intensive thinking!

Tom:D

chemclouds

08-09-2004, 03:11

You are probably right. We have given them enough to chew on.
Maybe too much.
Carl

chemclouds

08-09-2004, 14:39

Hi Roland,
You mentioned, "I hope you have already grounded the loop properly for lightning protection! "

The loop is grounded, I hope well enough for lightning protection. I am using a lightning arrestor.

You said, "I wonder a bit why you have already put the loop up in the open, it should work quite as well inside the house, which would make retuning and directing it a lot easier. "

I agree, it should operate as well inside and be a lot easier to tune but I can`t put it inside. It`s too large! If it was 1 meter in diameter yes but 2 meters thats a little too big.
Carl

chemclouds

09-09-2004, 01:00

20:11 TO 23:59

Tom,
Those absorptive clouds you spoke of, wrecked my reception.
Report similar to last night, but one exception, it`s inverted !! Those clouds are bad news !!
Carl

VE3MEO

09-09-2004, 01:27

Only caught the last hour - looks a lot better than Carl's cloudy last hour but 3.8% below target. Was dining while the log was running - saw the estimated impulse response for the last couple of minutes during which it was excellent, mostly <2ms.

Carl, did you have to take down your random wire antenna to put up the loop? It would be great to have both so you can switch between them.

73, Tom

chemclouds

09-09-2004, 01:38

Hi Tom,
No, I did not have to remove my long wire antenna. I removed it because I have too many antennas out there. I have a C- Band, KU-Band, S-band and and a Quadrifilar or Egg Beater Antenna for APT satellites. Now I have this large Loop. I can reinstall the antenna. My back yard looks like a Antenna Farm. Oh, I almost forgot. There also is a DBS satellite antenna out there as well.
Carl

chemclouds

09-09-2004, 02:55

00:59 TO 01:58

This frequency was logged during a thunderstorm.
Here, have another one. :)
Carl

VE3MEO

09-09-2004, 03:06

Impulse spread always pushing the guard interval limit of 5.31 ms and SNR just hovering around the threshold made for annoying reception - short mutes, dropped words.

Carl, that is some antenna farm! Mine is just the G5RV and a 2-meter J-pole atop a 30 ft tower. I'd like to put more up but the better half has nixed that so it's invisible devices hereon in. Hmmm, ESP cloud generators...

BTW, getting occasional burst on 3995 but mainly <8dB SNR - you should have better luck given your recent reports on the loop.

73, Tom

chemclouds

09-09-2004, 03:29

Hi Tom,
I wouldn`t give thumbs down on 90.4. hey, that isn`t bad.

Speaking of better half. My better half helps me with everythig. She helped me build this loop. She also helped me with all of the antennas. She also buys electronic parts for me. Even my LCD Monitor, she bought that for me too. My computer, she also bought all of the parts so I could build this computer. She always asks me before leaving work if there is anything that I need or want.
Lovely wife, can`t ask for a better one. She is half German.

Back to that report, 90.4 is a good report.
Carl

VE3MEO

09-09-2004, 03:48

I don't think so, Carl. 99.9% is good, 99.8% fair, 99.7% objectionable, 99.6% unacceptable for the average listener, according to Holden's Golden Rule. By the time you get to 90.4%, they are long gone! Now for the DXer, just getting lock on the signal to identify it is worth something - a very different metric.

Now maybe I exaggerate just a tad but most people would not be pleased with 15 seconds of dropouts per hour on a CD, on FM, on AM, on TV, on SW, on Internet streams. That's 0.4%. 90.4% success is nearly 6 minutes lost!

Yet with the signal strength delivered, had the modulation been AM, reception would have been 100% intelligible.

I see the same thing on 3995 - up to S9+20 db signal with S5 background noise and lots of adjacent interference - no decoding. But AM would be intelligible.

This DRM is frustrating - it can sound pretty good when the broadcaster does it right and propagation and interference are good and you can imagine you are listening to some other delivery mechanism than shortwave radio. But that's pretty rare, so far in my experience.

73, Tom

chemclouds

09-09-2004, 23:14

No Report,
Unable to decode signal. I found no problem on my end. I switched to RNWB on 15525. No problem with decoding.
Here is shot of the Spectrun Scope on 9800. I will submit this report for RNWB until the problem with CBC is corrected.
See attachment for CBC.
Carl

chemclouds

10-09-2004, 00:12

Hello,
I see the problem is now corrected. I will submit a 45 minute log at 00:00 UTC
Carl

chemclouds

10-09-2004, 00:54

23:15 TO 23:58

Here is the 45 minute log.
Carl

VE3MEO

10-09-2004, 01:11

From 22:38-23:11 no or very low DRM modulation with strong carrier present. From 23:11-24:00 normal DRM restored. Hence 44% successful decoding over entire period, 76% over period that DRM was actually functioning. The max/avg SNR relates to the active DRM period. Despite S9+20, the SNR was low.

Tom

chemclouds

10-09-2004, 01:55

Hi,
I don`t know if here will be a log for this freq. tonight. DRM transmission problems again.
Carl

VE3MEO

10-09-2004, 02:58

Missed first 13 minutes due monitoring RNWB. Not aware of a transmission problem with this schedule. Impulse response widespread and marginal DRM SNR even though strong signal. AM wins again!

Tom

chemclouds

10-09-2004, 04:45

Tom,
We should not pick on these engineers. They don`t seem to mind though. They must take it very well. I can say this. You don`t mind telling them the way it is.

The comment that you made earlier, you know, the %. I am beginning to agree with you.
Carl

chemclouds

11-09-2004, 00:59

20:38 TO 23:58

Tom,
I did reinstall the inverted L antenna today. Now I can switch from one to the other.
I put the loop in a different location. I drilled a hole in the ground stuck a pipe in there and slid the loop mast into it. No more ladder climbing. I just walk out on the deck lean over and tune in.
Tom, do you have room for a 1 wavelength beverage for 3995 ?

CBC, here is your report. ;)
Carl

VE3MEO

11-09-2004, 02:44

Originally posted by chemclouds
20:38 TO 23:58

Tom,
I did reinstall the inverted L antenna today. Now I can switch from one to the other.
I put the loop in a different location. I drilled a hole in the ground stuck a pipe in there and slid the loop mast into it. No more ladder climbing. I just walk out on the deck lean over and tune in.
Tom, do you have room for a 1 wavelength beverage for 3995 ?

Carl

Carl, you're a busy guy. Antennas going up & down at a great rate.

My property is only a 150' x 40' city lot at the bottom of a ravine and surrounded by neighbours' trees (none of my own). I can conveniently fit a 102' G5RV from the tower at the side of the house to a mast at the back of the yard, close to phone, cable and power lines. Aerial phone and cable and a clothesline run underneath. The G5RV probably runs ENE-WSW, sloping down towards the west. That's not ideal for DX from Europe but probably OK for high angle reception of Sackville which is also off the end. South Americans come in really well although reception of RNWB DRM from the Netherlands Antilles has not been good.

73, Tom

VE3MEO

11-09-2004, 02:59

Diffused impulse response with frequent violations of the guard interval and marginal DRM SNR despite S9+40 signal strength.

Tom

chemclouds

11-09-2004, 03:10

01:03 TO 01:58

Thanks for the reply Tom. Those beverages appear to be the Rolls Royce of receiving antennas. Yeah, I know what you mean. Living in the city. I own land 45 minutes west of here in the country. I have enough area there to string 100`s of them. But there is one major broblem. It`s not developed. Maybe as I get a little older I just might build and move there.
I am beginning to have enough city living.

CBC, Here is the report. The last 13 minutes was very good.
Carl

chemclouds

11-09-2004, 15:03

Hi,
After opening the loop trimmers, it will now resonate to 12 MHZ. It is now tuned to 11900.
TDPradio and NASB will be logged using this 2 meter loop mounted in vertical position. We will see how it goes compared to the inverted L.
Carl

chemclouds

11-09-2004, 17:55

16:00 TO 16:58 UTC
Hi,
Very strong signal 25 to 30 db. Dropouts recorded.
NASB to follow.
Carl

chemclouds

11-09-2004, 18:25

17:04 TO 17:29 UTC

Tom,
Here is my brief report on loop versus long wire. If you have the space I recommend the long wire. If space is limited, go for the loop. I enjoyed playing with the loop. It was interesting and easy to build. Don`t misunderstand, I am not saying the loop is not a good antenna. It has it`s advantages. Returning to long wire. For me, loop is now history.
Carl

NASB, here is your report.

chemclouds

11-09-2004, 23:12

19:55 TO 22:14 UTC

Hello,
I clicked the Software Radio off by accident.
I enjoyed Vinyl Cafe.
Carl

VE3MEO

12-09-2004, 01:03

That's good overall but the concentration of failed audio decoding is in a 10-12 minute period when the audio decoding success fell to 98.6% - that would be unacceptable for most listeners.

Tom

chemclouds

12-09-2004, 03:01

01:00 TO 01:59

Signal level on receiver 20 to 30 db. Excellent for AM. DRM doesn`t seem to be improving for this frequency.
Carl

VE3MEO

12-09-2004, 03:42

Much of it disjointed due to interrupted decoding.

Tom

tradio99

12-09-2004, 21:38

reception results in Nida, Lithuania (the Curonian Spit on the border with Russia),
I saw the signal during 7-10 min period only.

chemclouds

12-09-2004, 22:55

19:55 TO 21:58

Tom,
I know what you mean. I hope the shielding cures it.
Carl

CBC, here is a 2 hour report.

VE3MEO

13-09-2004, 01:03

Although 96.7% is below what I deem unacceptable, for 3.5 hours out of 4, reception was pretty good. The big dropout at 2120 was when I switched receivers - from DX-394A with no AGC prior to that time to DX-394B with AGC after. At times the no-AGC RX overloaded, at others the signal faded and needed a boost. Max SNR was achieved w/o AGC as Bernd and others have observed. But you have to keep tweaking the manual gain.

Tom

chemclouds

13-09-2004, 02:57

01:01 TO 01:58

The first 30 minutes was a bumpy ride.
Carl

VE3MEO

13-09-2004, 04:05

Not high enough success rate for enjoyable listening.

Tom

chemclouds

13-09-2004, 22:54

21:07 TO 21:59 97.9%

chemclouds

14-09-2004, 00:55

23:04 TO 23:58
Rough ride for the first 30 minutes. Quite good after that. Still missing that RNWB log.
Carl

chemclouds

14-09-2004, 02:12

01:00 TO 01:16

No need to record any longer. If I recorded for the remainder of the program it would be pretty much the same. I have had better results on 3995. Going to hang out on Huricane Watch Net.
No dropouts there.
Carl

VE3MEO

14-09-2004, 02:26

Solid until the last couple of minutes when dropouts began. This is the kind of performance we need regularly for DRM to compete favorably with AM in ionospheric propagation.

Tom

chemclouds

14-09-2004, 02:57

Hi Tom,
That is really great! Looks like the best you have logged for 9800. Did you log 6140 tonight ? I think some of those clouds are over here. How did the shielding go ?
Carl

VE3MEO

14-09-2004, 03:08

Guard Interval violations due to multipath spreading of impulse response.

Carl, I'm really slow at building things. The design keeps evolving. Now I'm trying to integrate my protoboard DRM upconverter into the same too small box as the DRM downconverter, to share a common oscillator for loopback testing. I made one box, mounted all the connectors and decide to scrap it because the metal (galv steel ducting sheet) was too light and the box was too small. I had a bigger plastic box with aluminum cover so now I have made an internal shield out of the galv steel sheet for it and mounted two pieces of pc board back-to-back - one for the up converter, one for the downconverter - so there will be some shielding between them. The soldering iron is hot - just started on the upconverter - but will likely be interrupted for a week or two before finishing.

73, Tom

chemclouds

14-09-2004, 03:18

Tom,
Sometimes it is require to go slow for the end results to be good. Ok, I understand. Hope all goes well.
Carl

chemclouds

14-09-2004, 22:53

20:22 TO 21:58

Hello,
It seems no one is logging RNWB on 15525 beamed to the USA East Coast. I am leaving 9800 at 22:00 to 23:00 and returning to this freq. at 23:00 to continue loging the final hour.
Carl

chemclouds

14-09-2004, 23:58

23:00 TO 00:00 UTC
NO REPORT

I returned at 23:00 to record the last hour.
Dead air. It bit the dust didn`t it ?
Carl

dk8cb

15-09-2004, 00:34

Originally posted by chemclouds
Dead air. It bit the dust didn`t it ?

No, they just switched it off for power saving after they learned from this forum that their only listener in the US had switched off ... :D

Roland

VE3MEO

15-09-2004, 00:39

Originally posted by chemclouds
23:00 TO 00:00 UTC
NO REPORT

I returned at 23:00 to record the last hour.
Dead air. It bit the dust didn`t it ?
Carl

According to my log, it disappeared about 22:58. I don't think that was scheduled. From 22:39 until then, propagation was great - 100% decoding, 19.5dB avg SNR, narrow impulse response noted at the start.

Tom

chemclouds

15-09-2004, 01:27

Tom,
What do you make of all this ? Kinda weird to me.
Carl

chemclouds

15-09-2004, 03:01

Originally posted by dk8cb

No, they just switched it off for power saving after they learned from this forum that their only listener in the US had switched off ... :D

Roland

I don`t know what is more exciting, DRM or reading some of these posts.

Not bad Roland, I almost fell for it.
Carl

VE3MEO

15-09-2004, 03:50

Presumably the transmitter used for 9800kHz failed, seriously enough that it could not be brought back up within the 90 minutes remaining in the schedule and no fallback transmitter equipped for DRM. I wonder if the same transmitter is used for 6140. If so, then the problem was cleared.

This is twice in the last week or so that there has been significant loss of DRM broadcast service from Sackville.

Tom

chemclouds

15-09-2004, 23:31

Hello,
I m leaving for a few to give RNWB a report.
Carl

chemclouds

16-09-2004, 02:54

01:00 TO 01:58

Tom,
Any idea why the time was cut short on 9800 ?
Carl

VE3MEO

16-09-2004, 03:37

Seems like BBCWS has terminated their arrangement for the 2300-2400 rebroadcast or a mistake has been made in scheduling the transmitter since it shut off at almost exactly the same time as last night.

Tom

VE3MEO

16-09-2004, 03:40

Guard interval violations caused frequent dropouts - frustrating listening. Higher frequency is usually better.

Tom

midre

16-09-2004, 20:52

Hi DRMs,

remarkable results from Sackville on 9800 kHz last night. I never had
receive such a stable signal from Sackville here at my location.
No co-channel, no interferences.
So I got 99% decoded audio until my notebook loose the power....

Is there something changed?

regards, Michael

chemclouds

16-09-2004, 21:46

Hi Roland,
I just received an e-mail from DRM man. His Doctor suggested a vacation for him to get away from DRM for a while and recommended him to visit Germany. He has been in Munich for the past few weeks. He said it is a great place to visit. Oh, his wife cancelled the divorce. She said after visiting Munich he is a new man. He is now being very responsible. While in Munich, to his surprize, he met others involved in DRM. He also took a few pictures while he was there. One of the pictures really surprized him! It was a picture of a DRM receiving station. "It looks similar to mine" he said. He seem to be thrilled that someone has a setup similar to his. He e-mailed me the image. You wouldn`t happen to know where this image was taken would you ?
There is a small nice looking receiver sitting on the desk. It looks like a Sangean. I can`t seem to make out the model number. It looks like an ATS-803. It Can`t be yours. No, it can`t be, Can it ?
No, this can`t possibly be your DRM monitoring station because you use DreaM. The monitor is displaying a DRM Software Radio. You don`t have DRM Software Radio. No, I don`t believe you do. Do you ? :D
Carl

chemclouds

16-09-2004, 21:57

Hello dn0758,
Welcome to this thread. We can use all the help we can get here. :)

Where are you located ?
Carl

chemclouds

16-09-2004, 23:56

20:00 TO 22:58. A 3 HOUR REPORT.

How about that. 100% cool. :cool:
You guys get a excellent report card this evening. A+
Come to the head of the class. :cool: clap clap clap.
Carl

VE3MEO

17-09-2004, 01:39

Great log, Carl! I didn't tune in until after 2300 - again no signal.

Tom

chemclouds

17-09-2004, 01:49

Thanks Tom,
That is the best I have logged for this freq.
I would say you were correct about this. Seems like BBCWS has terminated their arrangement.

How are the circuits coming along ?
Carl

chemclouds

17-09-2004, 03:07

01:00 TO 01:59

Reception on this freq. was better than usual.
90.4%
Carl

midre

17-09-2004, 08:24

Originally posted by chemclouds
Hello dn0758,
.......Where are you located ?
Carl

greater area of Frankfurt / Germany,
for exact position see screenshot......

Here are my last night results from Sackville on 9800 kHz.
Not as perfect as the night before, but nevertheless, 98%
decoded audio. Remarkable conditions .

...same as yesterday, notebook battery only works for
60 minutes...

regards, Michael

VE3MEO

17-09-2004, 17:51

Following from CBC, Sackville:
We currently have a problem with one of our transmitters which has been out of service for the last 3 days and hopefully will be back up and runnig soon. You should be able to pick up the BBC DRM tonight.

Tom

chemclouds

17-09-2004, 22:55

20:07 TO 21:59 99.7% ;)

HI Tom,
That is good news. I am going to give RNWB a report from 22:00 to 23:00 and I will return here for the final hour. We will see.
Carl

chemclouds

18-09-2004, 01:13

23:03 TO 23:58

Hello,
Something flew by here, moving rather slowly for around 30 minutes at the beginning of this broadcast, kinda screwed it up. Good to hear BBC again in DRM.
Carl

chemclouds

18-09-2004, 02:56

01:06 TO 01:58

Reception seems to be improving on this freq. 94.7% :p
Carl

simone

18-09-2004, 07:40

Hi all,
good results in the first hour last night, as in the past days no sign of the interfering stations that are usually on this frequency, see attachment
73, Simone

chemclouds

18-09-2004, 17:54

TDPradio 16:00 to 16:59

Hi Ludo,
Great show today! Tell your program director I said good programming for todays show.
The audio was feeding a Sony Digital Power Amplifier connected to a pair of AKG Headphones. I sure would like to hear it in Stereo.

NASB to follow.
Carl

chemclouds

18-09-2004, 18:26

NASB 17:00 TO 17:29

Hello,
The audio from NASB has a problem. The audio from Radio Taiwan International was very good.

Carl

lmaes

18-09-2004, 21:12

Hello Carl,

Thanks for your report of today on TDPradio. It's good to hear that you enjoyed today's music.

We are still working on the stereo for the Americas. Hope it will work out some day.

Ludo

simone

18-09-2004, 22:06

Hi Carl,

quote:The audio from NASB has a problem. The audio from China Radio was very good.

what was the problem with the audio from NASB? I had some dropouts maybe I missed the problem, btw it was Radio Taiwan Intl ;)

73, Simone

chemclouds

19-09-2004, 00:09

Hi Ludo and Simone,
Ludo, I will be looking forward to that! I hope it will be soon.

Simone, you are correct, it was Radio Taiwan International. I realized that after I submitted the log. Immediately after submitting it, I had a knock on my door, a family member from out of town came by for a visit. I missed most of the program on 9800 - I even missed Vinyl Cafe!

Now, about the audio from NASB. It was not clear or clean. It sounded scratchy and choppy. Sometimes describing how something sounds is difficult.

Allow me try it another way. Lets take speech for example with dominant frequencies of 300 HZ to 5 KHZ, using (ADPCM) Adaptive Differential Pulse Code Modulation Encoding, taking 2 bit samples somewhere around a 6 KHZ rate. That should come close to how it sounded to me.

P.S.: I corrected the above errors. :)
Thank you,
Carl

chemclouds

19-09-2004, 01:31

21:52 TO 00:01

The delay was due to a visit from out of town family member.
Carl

chemclouds

19-09-2004, 03:29

01:04 TO 01:58 99.6%

This frequency keeps getting better. I hope it continues.
Carl

chemclouds

20-09-2004, 00:54

19:57 TO 23:59

chemclouds

20-09-2004, 02:54

01:00 TO 01:58

chemclouds

21-09-2004, 02:53

20:10 TO 23:59

Hello,
I had to split shortly after starting this log. I did not return until about 23:45. I was not here to stop the recording in time on 9800.

6140 is coming up next.

Carl

chemclouds

21-09-2004, 02:56

01:00 TO 01:58

chemclouds

22-09-2004, 00:08

Hello CBC,
Since school has started, you will be graded using these figures for your future report cards - A 93-100 B 85-92 C 77-84 D 70-76 Below 70- F. Matters beyond your control, like transmitter outages, DRM Exciter, Encoder problems, or any equipment problems necessary for the transmission of DRM will not be deducted. The above grades are based upon successful Digital Audio Reception. Any grade below 70 will not be tolerated - do NOT FAIL! :D
Carl

chemclouds

22-09-2004, 00:56

20:05 TO 23:59

Hi,
You get an A on this report. 99.8% Have a smile face. ;)
Carl

chemclouds

22-09-2004, 02:59

01:00 TO 01:58 China Radio International

Hello,
Here is another good report. Again, you get an A. 97.9%. Allow me to toss this to you. :)
Carl

chemclouds

23-09-2004, 00:56

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:01 TO 20:30
RADIO NETHERLANDS------20:30 TO 2100
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

The Sound Blaster Live was feeding a Sony Digital Power Amp. Driving a pair of Klipsch KG3`s.
The audio was clean, clear and crisp. I have no complaints.

Well now, how about that. You get another A. Also, you get another one of these. :)
Carl

chemclouds

23-09-2004, 02:56

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58.

Oops, no A tonight on this freq. I dislike reports like this one. Tonight you get a D. You also get this. :mad:
Carl

chemclouds

24-09-2004, 01:26

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:00 TO 20:30
RADIO NETHERLANDS------20:30 TO 2100
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 22:48

I wonder what happened at 22:48. Yep, it bit the dust again didn`t it ? Whatever caused it, you got it up and running fast though.

You get an A for this report and another one of these. :)

This is report 1 of 2. BBC World Service is up next.
Carl

chemclouds

24-09-2004, 01:31

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

BBC WORLD SERVICE------23:00 TO 23:59

On this report, you get a B. Since you did so well in getting the transmitter problem corrected swiftly, I will give you two of these. :) :)

Report 2 of 2.
Carl

chemclouds

24-09-2004, 03:05

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:01 TO 01:58

On your report for tonight, how about an A. You also earn a cool smile face. :cool:
Carl

Alan Johnson

24-09-2004, 04:23

Don't know if this should be a separate thread or not, but is anyone else having trouble receiving the 0300 UTC broadcast of BBC from CBC on 11,955 kHz? Tonight (24 Sep 04) I had an average SNR of 24.4 dB, good pattern on the spectrum scope and a data message but no audio. Did someone forget to flip a switch at Sackville. This was at least better than two nights ago when there was no signal at all.

chemclouds

25-09-2004, 01:04

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------19:57 TO 20:30
RADIO NETHERLANDS------20:30 TO 2100
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

How about another A.
You received a good grade again tonignt. This is for you. :cool:
Carl

VE3MEO

25-09-2004, 01:46

Thumbs up because, for 2:40 hrs, it was 99.9%. Using latest DReaM 1.1.1cvs with MLC iterations at 4 to extract as much as possible.

73, Tom

chemclouds

25-09-2004, 03:11

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

You guys have been doing well since school started.
Your report card for tonight is showing an A. I enjoy giving you these. :) Here, have another. :)
Carl

VE3MEO

25-09-2004, 03:12

No thumbs up - I'm not as generous as Carl - I want to see 99.8% or better! But not thumbs down either - it was an interesting session. Propagation was very good with only occasional deep selective fades and no (or so rare that I didn't see them) broad fades. The climb in SNR for the last couple of minutes was because I switched in the 20dB pad and saw the SNR rise from around 20 up to 23dB. The longest period of 100% audio lasted 6 minutes - between the markers.

73, Tom

chemclouds

25-09-2004, 18:27

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

TDPradio STEREO------15:56 TO 16:59

What can I say ... I am pratically speechless! This boadcast has made history - , the very first of it`s kind - DRM STEREO Broadcast to the Americas! To both, CBC and TDPradio - a job well done. Congratulations!
100% :)
Carl

lmaes

25-09-2004, 18:37

Hi Carl,

It is good to read that you enjoyed the DRM STEREO broadcast of TDPradio. This was a test and we hope to receive many more reports so that we can decide to continue the broadcasts in stereo or not.

Can you tell something about the audio quality? We are of course curious.

We tried to receive a signal in Europe, but no luck this time. Enclosed the very poor result from Belgium. But that's not important, what is important is the good quality in the Americas!

Ludo
:rolleyes:

chemclouds

25-09-2004, 18:46

Originally posted by lmaes
Hi Carl,

It is good to read that you enjoyed the DRM STEREO broadcast of TDPradio. This was a test and we hope to receive many more reports so that we can decide to continue the broadcasts in stereo or not.

Can you tell something about the audio quality? We are of course curious.

We tried to receive a signal in Europe, but no luck this time. Enclosed the very poor result from Belgium. But that's not important, what is important is the good quality in the Americas!

Ludo
:rolleyes:

Hi Ludo,
The audio quality was superb. It was clean, clear and crisp. The low, mid and high frequencies were very good. No distortion. This broadcast was better than any FM Stereo Broadcast I have ever heard. I would like this broadcast to continue in Stereo. :)
Carl

chemclouds

25-09-2004, 19:18

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

NASB------17:00 TO 17:30

Hello,
My apology for not having a report for you today. I was busy with audio equipment.
Carl

VE3MEO

25-09-2004, 19:30

11 minutes at 100% but 95.8% overall is unacceptable for the casual listener.

The startup audio was rather sloppy - in the transition from TDP Radio in stereo to NASB in mono. Transmission continued for a bit in 2-channel mode and audio bounced around between mono up two channels and left channel only (maybe right only too) with some buzz. It eventually settled down.

73, Tom

Alan Johnson

25-09-2004, 20:34

No joy here in Western NA. Co-channel China Radio Intl. didn't help, I'm sure.

Alan

chemclouds

25-09-2004, 20:47

Originally posted by Alan Johnson
No joy here in Western NA. Co-channel China Radio Intl. didn't help, I'm sure.

Alan

Hello Alan,
Don`t expect to receive good reception on this frequency. It`s beamed to the Eastern US. Thanks for the report. Keep them coming when you can.
Have a nice weekend, :)
Carl

lmaes

25-09-2004, 20:54

Hello Alan,

Many thanks for tuning in. Nevada is indeed not the target area, so the chance of receiving the broadcast in a good way was relatively small.

Did you have the chance to tune in in the past with any reasonable reception, or has it always been poor in your area?

We are of course curious to know if the stereo broadcast decreased the reception area compared to the mono broadcasts from the past.

Ludo

Alan Johnson

25-09-2004, 21:37

Ludo-
This was the first time I tried to receive TDP Radio, so, unfortunately, I can't compare mono to stereo. I can usually receive the 1955 to 2400 UTC broadcasts from CBC on 9800 khz, I'm currently listening to the RNW segment with a SNR of 22.7 dB.

73,
Alan

TenTec RX-350 60/90 meter half-wave dipole

lmaes

25-09-2004, 21:47

Hi Alan,

The 9800 kHz broadcast uses a 268 degrees azimuth from Sackvile whereas our broadcast uses a 240 degrees azimuth with a narrower beam then for the 9800 kHz broadcast, so that could be the reason for non reception as well. Our broadcast is mainly targeted to Boston, Chicago, Detroit, New York, Philadelphia and Washington.

Thanks again for your monitoring.

Ludo

Originally posted by Alan Johnson
Ludo-
This was the first time I tried to receive TDP Radio, so, unfortunately, I can't compare mono to stereo. I can usually receive the 1955 to 2400 UTC broadcasts from CBC on 9800 khz, I'm currently listening to the RNW segment with a SNR of 22.7 dB.

73,
Alan

TenTec RX-350 60/90 meter half-wave dipole

df9rb

25-09-2004, 22:37

Hello,

this evening it was the first time that I could receive more than fragments from Sackville on 9800 kHz here in south east Germany.

73s from Df9RB, Bernd

df9rb

25-09-2004, 22:39

Sorry forgott the report for CBC on 9800 kHz

Bernd

Alan Johnson

26-09-2004, 01:03

Not bad today - I'm unsure what caused the 5 minute glitch at 2145 UTC.

TenTec RX-350 60/90 mtr dipole

chemclouds

26-09-2004, 01:10

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:05 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

Hello CBC,
Congratulations to you and TDPradio for making history today.

Well now, back to school. Here is another report card. You are still doing good. This evening, you get another A. You also get another one of these, :cool: for doing well.

Carl

chemclouds

26-09-2004, 03:08

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:03 TO 01:58

Well now, lets see. This is your report for tonight. Your report card for this freq. is a B+ . That`s not bad. Here, you may have this. :)
Carl

chemclouds

26-09-2004, 23:06

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:00 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 21:58

Hello,
It was necessary for logging to stop. I am in the process of adding antenna length. 100% audio decoding.
Carl

chemclouds

27-09-2004, 00:14

Antenna length extended from 14 meters to 30.5 meters. Will have report for CBC on 6140
tonight.
Carl

chemclouds

27-09-2004, 03:12

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:04 TO 01:58

Hello,
I`m not going to say it. However, I will say this. Why was I 4 minutes late in starting this log ? You wouldn`t know anything about that, would you? 92.6% successful. :)
Carl

VE3MEO

27-09-2004, 04:20

Here's a 1st report using two receivers:

1st DX-394B with AGC tapped at 2nd mixer into a wideband NE612 converter

2nd DX-394A tapped at 2nd mixer (and disconnected from rest of radio so no AGC or loading by parallel 2nd IF filter) into a preamp'd and filtered NE612 converter

Converters have a common local osc.

There seems to be something wrong with the DRMCalc report. Visually the 2nd Rx outperformed the 1st according to the plots but the reported "Correctly decoded audio" is lower. This is due to the log for the 2nd having started earlier than the 1st. The correct comparison is in the "Detailed Analysis" under "Decoded:". #2 wins. #1 probably suffered from image interference.

The first few minutes of the transmission were screwed up, as Carl hinted:

- late starting?
- then brief DRM
- then loss of transmission
- then AM
- then DRM

Tom

chemclouds

28-09-2004, 01:30

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

RADIO NETHERLANDS------20:43 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

My apology for the late start. I was outside for a while. Excellent reception until the last hour.
The last hour was a rough ride.
Carl

Alan Johnson

28-09-2004, 03:02

Looks like an A+ tonight. I hope 11955 does as well.

73,
Alan

TenTec RX350 and 220' wire 6' off ground

chemclouds

28-09-2004, 03:06

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:59

Hi,
This report is similar to the last. On this one the reception was very good, until the last 15 minutes or so.
Carl

VE3MEO

28-09-2004, 03:53

Here's a short log using two receivers with converters swapped:

1st DX-394A tapped at 2nd mixer (and disconnected from rest of radio so no AGC or loading by parallel 2nd IF filter) into a wideband NE612 converter

2nd DX-394B with AGC tapped at 2nd mixer into a preamp'd and filtered NE612 converter

After the short dropout at 1:49 I boosted the RF gain of #1 and was quite surprised to see the SNR climb to nearly 30 dB at one point. Highest I've observed off-air with these receivers and kluged up converters. However, #2 actually outperformed #1 overall by 0.3%.

73, Tom

Alan Johnson

28-09-2004, 04:32

Great reception for the first 26 minutes, then a nose-dive. I wonder what a lower frequency would do? When is the switch to winter frequencies?

Alan

chemclouds

29-09-2004, 01:05

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:03 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

Hello,
It must be the the remains of the storm. Looks like a seismograph.

Carl

VE3MEO

29-09-2004, 01:26

Pretty bumpy here too, Carl, for the last 30 min I was able to catch. There seemed to be an interferer at 9810 that I did not detect until after the end of transmission and then only on Radio Budapest at 9800 if I tuned up a couple of kHz. Strange modulation - swooping jumpy carrier that you could hear against the Radio Budapest carrier or the BFO. But not strong - so not sure if it was a factor. What was strange was that SNR diminished for no apparent reason - signal strong, power spectarl density looked good, channel transfer showing 9 or 10 nulls but not necessarily worse than when audio was successful, and the impulse response close to but not always exceeding the guard interval. So none of those analog indicators showed why MSC was too scattered.

At 23:47, Radio Budapest came on - the carrier was easily 20 dB higher. Remarkable that any DRM got decoded but seemed to worsen when their modulation started.

73,

Tom

chemclouds

29-09-2004, 03:09

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 02:00

Not bad for this freq. tonight. 99.7%
Carl

VE3MEO

29-09-2004, 03:28

Darn - missed a good one judging by this 10 minute sample and Carl's report. I was busy reading and posting in other threads while catching snippets of DW 3995 and not paying attention to the clock. Around the 1:53 mark I switched in the 20 dB RF attenuators - that had the effect of improving SNR on the receiver with AGC and degraded it on the one without. Then increased the latter's RF gain trying to squeak out the max SNR - hey, it broke 30 dB!

I continue to be astonished that the simple downconverter with no anti-image filter attached to the radio with no AGC outperforms the downconverter with the preamp and filter in this congested band, at least as far as max SNR is concerned. It seems that the image interference has to be really bad for the filtered one to excel. But without it, the images are very objectionable using DReaM's AM/SSB modes. Probably means that the downconverter should have a bypassable anti-image filter.

73, Tom

Alan Johnson

29-09-2004, 04:55

Slightly rocky start, but held out for 14 minutes longer tonight.

chemclouds

30-09-2004, 01:06

VATICAN RADIO------20:04 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

Not to bad tonight 97.4%.
Carl

VE3MEO

30-09-2004, 01:49

Poor here tonight except for last 10 minutes. The margin of performance for SNR narrows between the two receivers for poor conditions but the simpler receiver outperfroms for audio decoding.

73 Tom

chemclouds

30-09-2004, 03:05

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:05 TO 01:58

Look at this! 100%

:p ;) :cool:
Carl

VE3MEO

30-09-2004, 03:20

Wow, highest SNR yet on my DX-394A, no-AGC, simpler NE612 downconverter with no anti-image filter! Conditions good - S9+40 but multipath pushing impulse response close to guard interval. The dropout at 1:09 was me retuning the receivers from 6140 to 6142.4 for assumed best performance (although it may not be true for both). At 1:15, I think the blip was the insertion of the 20dB pads. At 1:28, I was retuning the common antenna tuner as the 2nd receiver was now tuned to DW 3995. Otherwise, I think decoding would have been close to 100%, as it was for the last 25 minutes.

73, Tom

Alan Johnson

30-09-2004, 03:49

Pretty good in the west tonight - discount the first five minutes, as I was selecting the best antenna and setting the soundcard mixer levels.

73,
Alan

chemclouds

30-09-2004, 05:02

Hi Alan,
I have noticed you have been diligent in submitting reports. It is appreciated. Don`t forget, you are helping DRM to be a success. Keep them coming when you can.

BBC WORLD SERVICE------03:00 TO 03:58

I haven`t been able to receive anything on this frequency for a few weeks now. It`s good to have you back again. :) 97.6%
Carl

Alan Johnson

30-09-2004, 05:03

The transmission held up for the entire hour - only a few brief audible dropouts towards the end.

Alan

chemclouds

01-10-2004, 01:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:06 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

Smooth sailing until the last hour. 96.5%
Carl

chemclouds

01-10-2004, 03:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

Smooth sailing all the way.100% :cool:
Carl

Alan Johnson

01-10-2004, 05:02

A full hour of good reception. Perhaps it was the A index of 2 and K index of 0 at 0310 UTC.

Alan

chemclouds

02-10-2004, 01:07

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------19:59 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59
98.5%

What happened before 20:45 ? Did Audio Equipment take Chicken Flu ? :D
Carl

VE3MEO

02-10-2004, 01:17

Not so good. Only 12 minutes @100%. Don't know why the SNR crossed over at 23:28. It seemed like my decoders had swapped sides - I was adjusting the RF Gain of what should have been the left side but seeing results on the right. Yet later, after stopping the logs, the radios were properly associated with the left-right positions on screen. Is it possible that the data for the 1st radio changes colour at that point?

73, Tom

chemclouds

02-10-2004, 03:06

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:03 TO 01:58

Not to bad tonight. 99.9%

Hey Tom,
Check out Ludo`s tranmission tomorrow if you can.
Carl

VE3MEO

02-10-2004, 03:16

Had I not been fiddling the tuner and the pads and doing other things on the computer, I think this might have been 99.8% over the whole hour instead of the 46 minutes marked. Seems like DReaM has a logging error for the frames decoded where it occasionally incorrectly attributes more frames in one minute and less frames in the next but the total over two minutes is right. This is noticeable when there are no dropouts and the frame rate is 1500 per minute. The spike around 1:38 is logged thus:

0033 27 150 1500/10 0
0034 29 150 1510/10 0
0035 30 176 1760/10 0
0036 31 124 1230/10 0
0037 30 150 1500/10 0

The average of elapsed minutes 34-36 is 1500, as it should be for perfect decoding.

73, Tom

VE3MEO

02-10-2004, 03:20

Originally posted by chemclouds

Not to bad tonight. 99.9%

Hey Tom,
Check out Ludo`s tranmission tomorrow if you can.
Carl

That's an understatement, Carl, especially coming from you :D

I'll try - if it's in stereo, that will give me a chance to check how the new DReaM routes stereo through one audio output, i.e., if it is summing the two channels.

73, Tom

Alan Johnson

02-10-2004, 04:24

Very poor tonight - not even worth recording for analysis.

Alan

VE3MEO

02-10-2004, 17:11

DRM was late starting. First 4 minutes were in AM.

Tom

VE3MEO

02-10-2004, 18:42

DRM was late starting. First 4 minutes were in AM. I'm giving this a thumbs up - I think many of the audio dropouts were due to computer operations - they don't correspond to SNR dips - so overall would probably have been much closer to 100%. Signal strength was medium to weak averaging S3 and ranging from S0 to S5.

Using the latest DReaM I used one instance that takes the left input signal and decodes the left DRM stereo channel to the left speaker. I played around with a couple of different second instances - one that takes the right input signal from a different receiver and decodes the right DRM stereo channel to the right speaker; another that sums the DRM stereo channels to the right speaker; and the normal one that decodes stereo to the two speakers. Surprisingly, the left-left, right-right combo did provide a stereo image a good part of the time but the left-right delay can change depending on decoder delay differences. Obviously, the default DReaM configuration is the right way to listen in stereo; I was just checking that the new output routing parameters work.

73, Tom

simone

02-10-2004, 21:44

Hi all,
transmisssion from Sackville could also be received in Germany, S/N up to 20dB, see attachment
The NASB announcement was the old one from the European transmission mentioning DRM to Europe and the old schedule ;)
73, Simone

lmaes

02-10-2004, 22:45

Hi Tom and Simone,

Many thanks for the report on the TDPradio broadcast. We did try to receive the broadcast as well, but not so much as Simone. Signal was there sometimes, but no audio decoded.

Ludo

chemclouds

03-10-2004, 06:05

TDPradio AND NASB 16:03 to 17:29 UTC
Hello,
I left here at 17:30 UTC. I took family to the State Fair. I did not return until around 04:30. I was planning on returning at around 21:00.
As you can see, I didn`t quite make it. My feet feels like they have been walking on hit coals.

Hi Ludo,

Here is the report. TDPradio and NASB
Carl

chemclouds

03-10-2004, 08:02

Excellent job on the engineering Ludo.
Great improvement on the low frequencies.
Oh, one other thing, the dynamics was also much improved.
My wife mentioned that she liked the music from TDPradio. It may become one of her favorites. But I thought she liked classical music. :eek:

Carl

df9rb

03-10-2004, 09:37

Hi,

nearly no decoded audio during the first 30 minutes. After 20:30 the reception improved here in South East Germany.

Bernd, DF9RB

Alan Johnson

04-10-2004, 01:02

It appears that it took awhile for propagation to support the path, but once conditions were good reception was not bad. I'm not sure what I did to stop recording at 23:38 (I was doing some other work on the computer at that time) but good audio held up to 23:59.

73,
Alan

chemclouds

04-10-2004, 01:05

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:01 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

Carl

chemclouds

04-10-2004, 03:01

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

Okidoki, how about 100%.
Carl

VE3MEO

04-10-2004, 03:40

Condx worsened right at the start!

73, Tom

VE3MEO

04-10-2004, 04:03

Not as solid as Carl's reception in Virginia. 1st 2:47 hours pretty good - 99.7%. Switched the 2nd radio to another station at 22:00 so show the comparison for 1st 2 hours only. The no-AGC, no 2nd IF filter, wideband downconverter wins again - by nearly a full percentage point - up where it counts: 99.7%.

73, Tom

Alan Johnson

04-10-2004, 04:25

Asleep at the switch in Sackville tonight?

Alan

VE3MEO

05-10-2004, 01:13

The big notch at 22:59 looks like the DRM transmission was interrupted. 99.9% from 23:00 for 58 minutes was great.

73, Tom VE3MEO

VE3MEO

05-10-2004, 03:07

OK, so there is a big dropout near the start of the log - that was me adjusting the receiver frequency with a consequential 4dB rise in SNR. After 01:03 - 100%. If I had left it alone, it probably would have been 100% all the way, albeit with lower SNR, instead of the overall 99.2%. Nice, stable propagation. DRM the way it should be.....

73, Tom

chemclouds

05-10-2004, 03:10

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:02 TO 01:58

It even caused me to be late recording this log. 99.8%
Carl

chemclouds

06-10-2004, 01:08

BBC WORLD SERVICE------23:30 TO 23:59

That is all I have, just 30 minutes of a 4 hour broadcast. I got into Trance Music. I had a difficult time getting out. I guess I deserve one of these. :(
Carl

VE3MEO

06-10-2004, 01:18

A mostly unattended log. 99.7% over the first 30 minutes is fair. I wonder how much of the dropouts before 23:39 were computer issues. At 23:39, there was clearly a CPU overload problem - I had not noticed until you see the log for the 2nd radio come up that I ahd the BP filter on for the 1st instance of DReaM and had MLC iterations set to 4 for both. The computer was running close to or at 100% CPU utilisation for the whole log up to that point. What's interesting around the 23:39 dropout is that the frames/minute reported by DReaM exceeds the maximum possible. That must be an artefact of the CPU saturation. Perhaps whenever we see a positive error that is not balanced out by a succeeding negative we should be suspecting that it is a computer resource problem.

73, Tom

VE3MEO

06-10-2004, 03:11

Why do I give a thumbs up for a mere 98.2%? Because I think the dropout that occurred around 01:54 must have been caused by the computer. Had my back turned for quite a while working out how to use a CVS client and compiling DReaM so the notebook may have been doing some power conservation thing. I even seemed to be causing disruption waking up the screensaver. The SNR was high throughout for the 1st receiver. The 2nd rx was the DX-394B with AGC and the preamp/filtered ne612 downconverter.

73, Tom

chemclouds

06-10-2004, 03:36

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:59

Good results tonight. 99.9%
Carl

Alan Johnson

06-10-2004, 05:01

Excellent reception tonight, especially considering that I could only get just 3-4 minutes of recovered audio the night before.

99.9%

73,
Alan

Owdjim

06-10-2004, 06:31

Over the Southern Hemisphere winter this transmission has provided some very good reception Down Under, but the attached graph is typical of how this transmission is
(not) being received here.

I miss my BBC!

Cheers, Chris

chemclouds

07-10-2004, 01:04

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

chemclouds

07-10-2004, 03:10

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:59

Correctly decoded audio is 99.8%.
Carl

Alan Johnson

07-10-2004, 05:19

30 good minutes tonight - then I had to switch it off.

Alan

chemclouds

08-10-2004, 01:00

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

BBC WORLD SERVICE------23:00 TO 23:59

Well, I kinda missed the others. :o
Carl

chemclouds

08-10-2004, 03:05

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

99.8% successful audio tonight.
Carl

chemclouds

09-10-2004, 01:05

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:00 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

98.8% successful audio decoding tonight.
Carl

Alan Johnson

09-10-2004, 01:18

These are my results for today. I suspect that the dip beginning at 2305 is due to my absence from the computer and inability to adjust the sound card's input level, since lowering the level restored reception at 23:52.

Alan

VE3MEO

09-10-2004, 02:14

Dropouts throughout log except for the last 20 minutes.

73, Tom

VE3MEO

09-10-2004, 02:16

A little better than last night. Two 30 min. periods with 99.8% audio.

73, Tom

chemclouds

09-10-2004, 03:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:03 TO 01:58
I have for you tonight a 99.3%.
Carl

VE3MEO

09-10-2004, 03:54

1st 23 minutes pretty poor; remaining 44 minutes logged was 99.9%. This was with the no AGC, no 2nd IF filter DX-394A. The 2nd radio was the DX-394B with AGC and 12kHz filter.

73, Tom

simone

09-10-2004, 18:12

Hi all,
seems to me there is a problem with the audio from NASB, is anyone in the target area able to get proper audio?
73, Simone
Edit 17:17 UTC: it seems the problem has been solved, audio is OK now

chemclouds

09-10-2004, 18:20

Hi Simone,
You are correct. There was no audio until around 15 minutes after the hour.
Carl

simone

09-10-2004, 18:25

Hi Carl,
thanks and when audio was OK it was mono as it should be for the NASB broadcast
73, Simone

chemclouds

09-10-2004, 18:46

NASB 17:15 TO 17:29

Hello,
As stated earlier, audio did not start until around 17:15.
I also noticed a low level hum in this broadcast.
Carl

chemclouds

10-10-2004, 01:00

chemclouds

10-10-2004, 03:01

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 02:00

Correctly decoded audio for tonight is 96.8%.
Carl

VE3MEO

10-10-2004, 03:15

Unattended log after 1st 10 minutes during which I was inserting filters between the no-AGC, no 2nd IF filter DX-394A and the simple NE612 downconverter, after which I left it with a LF-D6 15 element 10kHz filter in place. From this point to the end, the decoding was 97.5% while the 2nd receiver was 98.7%. #2 is the DX-394B with AGC and a preamp'd, filtered downconverter. It looks like some fades took out #1 because there was no AGC.

73, Tom

VE3MEO

10-10-2004, 03:21

After the guests left, just caught the last 20 min. Great! 100% on both radios for the 18 minutes or so.

73, Tom

chemclouds

11-10-2004, 01:02

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

Hi,
I didn`t give thumbs down because of the percentage of audio recorded. The thumbs down was for the audio quality. I rate it a max. of 70%. Here's why. The low frequency was down. The midange frequncies were boosted along with the high frequencies. The dynamics of the audio leave a lot to be desired. For voice it is ok. Not excellent, just ok. If someone used an audio equalizer, that would help but it wouldn`t correct the problem. The audio should be flat, throughout the audio spectrum. The audio was clean and clear. No distortion that I could hear. If you are to transmit music using digital techniques, may I suggest you strive for a flat frequency response with a wider dynamic range. On Saturday October 9, TDPradio`s transmission had good audio quality, with good dynamics. If you are unsure how to resolve the above problems, ask Ludo. He has it together. :)
Thank you,
Carl

Alan Johnson

11-10-2004, 01:10

Could only listen to about the last hour, due to trying to get antenna projects done before cold weather hits. I didn't pay attention to the audio quality of the broadcast, since I was listening in background mode.

73,
Alan

chemclouds

11-10-2004, 03:06

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:03 TO 01:58

I have picked on you guys enough tonight. Here is your report.

Carl

chemclouds

12-10-2004, 01:02

chemclouds

12-10-2004, 03:01

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:04 TO 01:59

The audio as usual, was clean and clear. No further report.
Carl

chemclouds

13-10-2004, 01:06

chemclouds

13-10-2004, 03:23

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 02:59

chemclouds

14-10-2004, 02:59

chemclouds

14-10-2004, 03:01

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 02:00

chemclouds

15-10-2004, 00:59

chemclouds

15-10-2004, 02:59

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:59

chemclouds

16-10-2004, 00:59

chemclouds

16-10-2004, 02:59

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:01 TO 01:59

chemclouds

16-10-2004, 18:30

NASB 17:08 to 17:28

chemclouds

17-10-2004, 00:59

Alan Johnson

17-10-2004, 00:59

100% audio for the BBC from 2300 to 2359 UTC!

Alan

chemclouds

17-10-2004, 03:02

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

I recorded a 99.9% for tonight.

Carl

Alan Johnson

17-10-2004, 04:03

No transmission tonight as of 0305 UTC.

chemclouds

18-10-2004, 01:05

chemclouds

18-10-2004, 03:00

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:24 TO 01:59

chemclouds

19-10-2004, 01:01

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------19:55 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

chemclouds

19-10-2004, 02:58

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:59

chemclouds

20-10-2004, 01:07

I was going to submit a Log using DReaM but I forgot to check the log file. Well, I blew it on this one. Don`t say a word.
Carl

chemclouds

20-10-2004, 03:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:25 TO 01:58

This is my first log report using DReaM. Yeah, good for you. DUH
Carl

chemclouds

21-10-2004, 01:02

chemclouds

21-10-2004, 03:10

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------00:59 TO 01:59

This is my last report using DReaM. I ran DReaM and Software Radio simultaneously during this broadcast and found DRM Software Radio with a better SNR of 2 db. There are several things I like about DReaM. The most interesting, it has a transmitter. Feed this into a modified FM Exciter. DRM Pirate Radio. Just kidding.
Here is my last report using DReaM.
Carl

chemclouds

22-10-2004, 00:17

VE3MEO

22-10-2004, 01:25

Originally posted by chemclouds
This is my last report using DReaM. I ran DReaM and Software Radio simultaneously during this broadcast and found DRM Software Radio with a better SNR of 2 db.
Carl

Carl, that's a surprising observation compared to all other comparative reports I have seen of DReaM 1.1.1c vs DRMrx whicch show DReaM reporting equal or higher SNR. More importantly, they also show DReaM achieving a higher success rate with audio decoding.

If you have enough CPU horsepower, run them both and use the DRMcalc compare logs feature to see the difference.

I don't have DRMrx so cannot provide first-hand observation but have scanned a lot of reports showing concurrent logs from both.

73 Tom

VE3MEO

22-10-2004, 02:41

I just got around to looking at this log from my Monday night and post it only because it recorded a new high for max SNR for my receiver - 31.8 dB. Actually saw 32.4 before I turned on the log but no proof! The relatively poor audio decoding was due to playing around with the antenna switch and disturbing my flaky breadboard downconverter.

73, Tom

chemclouds

22-10-2004, 03:04

Originally posted by VE3MEO

Carl, that's a surprising observation compared to all other comparative reports I have seen of DReaM 1.1.1c vs DRMrx whicch show DReaM reporting equal or higher SNR. More importantly, they also show DReaM achieving a higher success rate with audio decoding.

If you have enough CPU horsepower, run them both and use the DRMcalc compare logs feature to see the difference.

I don't have DRMrx so cannot provide first-hand observation but have scanned a lot of reports showing concurrent logs from both.

73 Tom

Hi Tom,
Ok, I will run them both tomorrow night on 6140. I will also submit both logs.

Carl

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:01 TO 01:59

chemclouds

23-10-2004, 01:02

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:14 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

Shortly after 02:00 I will upload two log reports. The two logs will be used for comparing the SNR of DRM Software Radio 2.0.34 and DReaM 1.1.1cvs. The frequency will be 6140 CBC. The reports will not be zipped together. They will be uploaded separately.
Carl

VE3MEO

23-10-2004, 01:50

Very interesting - Rx#1 was connected to my 2m J-Pole antenna up about 35'. Rx#2 is the DX-394B with the not so good converter connected to my 104' G5RV up about 30' and oriented so that Sackville is more or less off the end.

I was having dinner through much of the logging period but, before the log, switched Rx#1 between the two antennas to verify what I was seeing as a difference between the antennas in the image in the next posting - the estimated impulse response was much narrower for the vertical than for the horizontal antenna for at least some of the time.

I suspect the audio and SNR drops for Rx#2 were due to guard band violations. None occurred with Rx#1 and the vertical. This is probably almost entirely due to the vertical's discrimination against high angle multi-hop paths which would arrive delayed relative to the shortest path.

It's a short vertical, just 2.3m exposed, and a vertical run of coax down the tower which may or may not act as a radiator to some extent in the 30m band. The exposed part is less than 1/10 wavelength at 9800 kHz but should favour vertical polarisation and exhibit a null in pickup straight up.

BTW the log time could be wrong by 5 minutes or so - transmission ended at 23:58 or so as usual but I edited the log to cut off the 5 min or so overrun at the end and took out the first 5 minutes when I was switching antennas.

73, Tom

VE3MEO

23-10-2004, 01:55

Originally posted by VE3MEO
Very interesting - Rx#1 was connected to my 2m J-Pole antenna up about 35'. Rx#2 is the DX-394B with the not so good converter connected to my 104' G5RV up about 30' and oriented so that Sackville is more or less off the end.

I was having dinner through much of the logging period but, before the log, switched Rx#1 between the two antennas to verify what I was seeing as a difference between the antennas in the image in the next posting - the estimated impulse response was much narrower for the vertical than for the horizontal antenna for at least some of the time.

Rx#1 with the vertical ant on the left showing 1.54ms pulse width.
Rx#2 with the horizontal on the right showing 4.31ms pulse width.
Pulse amplitude made approx equal by adjusting RF Gain of the no-AGC Rx#1.

chemclouds

23-10-2004, 02:59

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

This is log 1 of 2, loggd using DReaM
Carl

chemclouds

23-10-2004, 03:01

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

This is log 2 of 2, logged using DRM Software Radio,

Seems as though DRM Sofware Radio did just a bit better.
Carl

VE3MEO

23-10-2004, 03:19

Good conditions on both 30m and 49m from Sackville but the vertical did not exhibit the advantages it had on 30m two hours earlier. The Channel Impulse Response seesawed back and forth between the two radio/antenna combinations. The initial impulse was generally weaker than the second impulse.

I awarded 100% even though the log is not because the interruption to both at 01:10 was due to a heavy web page overloading the CPU.

Rx#2 logging was accidentally interrupted when I went to mute the audio and clicked the wrong box. I edited its logs to assemble the two into one. There is one audio dropout period at 01:40 due to reception so it was less than 100% but close.

73, Tom

simone

23-10-2004, 07:54

Hi all,
good conditions last night till 2115, see attachment
73, Simone

VE3MEO

23-10-2004, 13:48

Originally posted by chemclouds

This is log 2 of 2, logged using DRM Software Radio,

Seems as though DRM Sofware Radio did just a bit better.
Carl

Well, I'll be! They match to within 0.1dB on Max SNR but the DRMSWR average and audio decoding rate are significantly higher. In all other dual reception reports I have seen, it has been the opposite, ever since DReaM 1.1.

I wonder if DReaM is more susceptible to interference from other applications running on the CPU.

Anyway, I see no compelling reason to buy DRMSWR given the success I have with DReaM and the overall evidence that the two are very close in decoding performance. And DReaM does more things - I have been enjoying listening to BBC in ECSS mode using DReaM's SSB demodulator.

73, Tom

chemclouds

24-10-2004, 01:00

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

RADIO NETHERLANDS------20:33 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

chemclouds

24-10-2004, 03:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:59

simone

24-10-2004, 14:13

Hi all,
another attempt to listen to the famous "Vinyl Cafe" but it worked only for 10min :( , see attachment
73, Simone

chemclouds

25-10-2004, 01:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

There have been a few of you reporting a high SNR using no agc. I thought I would give it a try.
This report was logged with no agc. That is, agc switched off. All of the previous reports I have logged has been either in slow or fast agc mode. On this one the agc was switched out of circuit.
I can see one needs to adjust the gain manually. I wasn`t at the receiver to do that. I was busy with other matters. This is the highest SNR I have achieved. 30.5 db.
Carl

chemclouds

25-10-2004, 02:59

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

VE3MEO

25-10-2004, 13:47

The G5RV connected receiver once again outperformed the vertical J-Pole on this frequency, overwhelming the latter's inherently higher Max SNR capability.

But 98.7% not a great success rate - multipath just too much despite excellent signal strength.

73, Tom

VE3MEO

25-10-2004, 13:55

On this freq, the vertical J-Pole connected Rx once again outperformed the horizontal end-on G5RV, despite the latter's higher signal strength. Once again, it was generally better impulse response that made the difference.

:p 100% from 21:37 to 22:46.
:( but even 98.8% overall does not cut it in my books. Means it was down to 97.6% for rest of the log.

Discarded the start up to 21:37 for Rx1 because of an intermittent in the downconverter that got corrected then. Really must get this thing soldered down.

73, Tom

chemclouds

26-10-2004, 01:14

VE3MEO

26-10-2004, 01:17

Vertical wins again but 98.7% not quite good enough. Longest interval at 100% 32 min from start of log. I suspect some of the dropouts might have been mitigated by AGC but I was not observing at the time.

73, Tom

VE3MEO

26-10-2004, 01:19

Originally posted by chemclouds
I have a higher SNR than last night. Tonight the SNR is 30.6 db. with agc off.

Carl

Hey, Carl. You're getting up there - I'll add you to my list of 30dB busters!

73, Tom

chemclouds

26-10-2004, 01:24

Hi Tom,
There is a broblem by not using the agc. One has to be in front of the receiver to adjust the the gain manually. If this is not done you suffer more dropouts due to gain changes.
Carl

chemclouds

26-10-2004, 03:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

VE3MEO

27-10-2004, 00:30

Originally posted by chemclouds
Hi Tom,
There is a broblem by not using the agc. One has to be in front of the receiver to adjust the the gain manually. If this is not done you suffer more dropouts due to gain changes.
Carl

I know. The trick is to modify the AGC so that it operates but results in a gain distribution through the front end ahead of the DRM downconverter that is closer to the optimum for DRM.

73, Tom

chemclouds

27-10-2004, 01:03

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------19:57 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:58

It seems the highest SNR that everyone has reported is achieved when the agc is off and the gain is adjusted manually.
Could it be when the agc is off, it prevents agc and rf back-mixing which increases the SNR ? This is the highest SNR I have achieved to date. 31.9 db.

Carl

VE3MEO

27-10-2004, 01:05

Vertical J-Pole and no-AGC Rx wins again, hands down. The G5RV/Rx with AGC must have suffered from guard interval violations. Longest, acceptable audio decoding was 99.8% 23:15-23:58 or 43 minutes.

73, Tom

chemclouds

27-10-2004, 02:58

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:01 TO 01:58

chemclouds

28-10-2004, 01:07

VE3MEO

28-10-2004, 02:13

G5RV wins over J-Pole again. Transmitter problem caused the big gap around 01:25. Dropped out, went to AM, couple of attempts at DRM, seemed to be a mix of carrier and very wideband hash for a minute or so twice.

73, Tom

VE3MEO

28-10-2004, 02:28

Originally posted by VE3MEO
The G5RV/Rx with AGC must have suffered from guard interval violations. Longest, acceptable audio decoding was 99.8% 23:15-23:58 or 43 minutes.

Attached is a screenshot of the carrier + hash condition. The 1st IF filter and the downconverter filter restrict the spectrum to 15-20kHz and it looks to be filled with the hash. I should have tuned around to see how far it extended but it was bad and would have interfered with 2nd adjacent channels.

73, Tom

chemclouds

28-10-2004, 02:57

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:00 TO 01:58

chemclouds

29-10-2004, 01:00

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:17 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59

The audio quality of the speech is :)
The audio quality of the music is :mad:

Carl

chemclouds

29-10-2004, 01:15

Hello Tom,
I was looking at your 30 db buster list. I found an error. The error is in my highest SNR. It is 32.3 not 32.6. I thought you would like to know. Maybe I will get 32.6 db. I don`t know but I will keep trying.
Carl

chemclouds

29-10-2004, 03:00

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

CHINA RADIO INTERNATIONAL------01:10 TO 01:59

chemclouds

30-10-2004, 01:01

ALL BROADCASTS ARE IN COORDINATED UNIVERSAL TIME. UTC

VATICAN RADIO------20:02 TO 20:30
RADIO NETHERLANDS------20:30 TO 21:00
RADIO CANADA INTERNATIONAL------21:00 TO 22:00
DEUTSCHE WELLE RADIO------22:00 TO 22:30
RADIO SWEDEN INTERNATIONAL------22:30 TO 23:00
BBC WORLD SERVICE------23:00 TO 23:59