CVC - Voz Crista - 17660kHz from Santiago [Archive] - Page 2

dk8cb

04-08-2006, 21:07

Very good reception today with a constantly increasing signal strength throughout my logging period.

@ Mathias:

Please have a look at the enclosed WMER vs carrier index diagram with its maximum at the edges which is very characteristic for your DRM transmissions.

Roland

dk8cb

07-08-2006, 21:18

Again no signal today in Munich.

Are there now no transmissions on Mondays?

Roland

dk8cb

08-08-2006, 19:57

Nothing received again today.

Have transmissions been stopped altogether?

Roland

Brendan1

08-08-2006, 20:42

Roland - I have not seen anything here in the US either. Propagation has not been as good for the last 24 hours or so, but still no signal has been visible here. When signals are faint, I use the waterfall display in Dream to see if anything is there, and there has been nothing.

73

dk8cb

08-08-2006, 20:55

When signals are faint, I use the waterfall display in Dream to see if anything is there ...

So do I. :)

Roland

mathias_s

08-08-2006, 21:17

Hi all,

Yesterday we were broadcasting for a bit more than an hour, but the transmission was not good, so we switched off. Today we were not transmitting, but we hope to have transmission tomorrow, and a good one. Thanks!

Mathias

dk8cb

09-08-2006, 19:51

... but we hope to have transmission tomorrow, and a good one.

Unfortunately, the latter wasn't the case. See screenshot for what I got. Signal was very weak, however it was still daytime here which, under current conditions, seems to play a role on this frequency as I have found out in the past. I did not get a single bit of audio.
Transmission also ended prematurely and I guess that something went wrong.

Roland

dk8cb

10-08-2006, 19:32

Nothing received today, not a trace of a DRM signal.

Roland

mathias_s

10-08-2006, 19:49

Hi Roland,

Our "good transmitter" had a modification and I thought it will work better, but we still have to work on it. I hope we soon will be back on air with DRM.

Mathias

dk8cb

11-08-2006, 19:22

Hi Mathias,

i just saw how you tuned up the transmitter and it was interesting. At the beginning and for most of the time, I could see the carrier and +/- 1 kHz sidebands but during the procedure, sidebands at +/- 2 kHz were often quite strong. Shortly before the end, the signal became much stronger and the +/- 2 kHz sidebands disappeared completely.
But it was also interesting to see how my software synchronous demodulator had to readjust the centre frequency by about 60 Hz when the signal strength increased. So there seems to be some kind of frequency pulling with more power. Should not be like that.

Unfortunately, the DRM signal which followed was weak and I can see that you are tuning up again...

Now it seems that it didn't work.

It's the nonlinearity devil! Have a nice weekend anyway.

Roland

dk8cb

15-08-2006, 12:42

Absolutely nothing received on Monday, August 14th. I suppose there was no transmission.

Roland

dk8cb

15-08-2006, 19:07

Also no signal received on August 15.

Roland

FritzWue

15-08-2006, 19:33

Hi Mathias,

I'm on holiday this week, why is there no signal? ;)

dk8cb

15-08-2006, 19:52

Hi Mathias,

I'm on holiday this week, why is there no signal?

Perhaps Mathias has a day off for his birthday.
:)

Let's hope it was a nice and happy one!

Roland

FritzWue

15-08-2006, 22:07

Aaah, me see!
Happy birthday Mathias! :D

mathias_s

17-08-2006, 19:24

Hi all!

Thanks for your messages!
Since yesterday we are on air again.

Mathias

dk8cb

17-08-2006, 19:32

Since yesterday we are on air again.

Aaaah, there you are today.
However when I switched on yesterday at 18:00 UTC, there was nothing. Perhaps you started a bit late but since I wanted to leave the house and as there was nothing at the usual start of transmission, I switched off and didn't start an unattended log.

Roland

dk8cb

17-08-2006, 20:50

Good reception but suddenly the TX went off the air.
SNR was rather low.

I can still receive your AM transmission 20 kHz higher but the signal is rather weak, I suppose you are beaming to somewhere else.

EDIT: Just noticed that your signal is back. Log of final part is also attached.

Roland

FritzWue

17-08-2006, 21:10

I missed most of the transmission, so here only the last minutes.
Never seen such a constant audio play with such a weird impulse shape.
Frequency is about 340Hz too high, snr higher at the upper and lower end of the signal, audio bandwidth and sound is good.

dk8cb

17-08-2006, 21:16

Never seen such a constant audio play with such a weird impulse shape. Frequency is about 340Hz too high, snr higher at the upper and lower end of the signal, audio bandwidth and sound is good.

The WMER bathtub shape is very characteristic for this transmitter. The impulse response looks the same here in Munich but a similar one can also be seen on transmissions from RNZI on 13730 kHz. This seems to be common to signals which had to propagate via the equator.

Roland

FritzWue

17-08-2006, 21:24

Hi Roland,

thanks for comment.
99.96% CDA at 21 kbps with this low SNR and that fluctuating signal nevertheless is very good!
I would expect much lower CDA values with such an impulse response.
Some more screenshots:

dk8cb

18-08-2006, 21:06

Not such a good result today. Signal was not strong enough during the first hour to overcome the noise level, there were also a few moments when local noise pulses caused dropouts. However, signal strength during most of the second hour was quite good and reception improved a lot.
SNR was quite low today.

During the programme in the second hour, thanks were sent out to the staff operating the transmitters in Chile. :)

Roland

dk8cb

21-08-2006, 21:08

When I tuned in at 18:00 UTC, I couldn't detect a signal and I tuned the receiver to somewhere else after a waiting period of a few minutes.
When I came back half an hour later, there was a signal but it was very weak and I did not get audio until two minutes before the end and even then audio was still very discontinuous.

My worst result on this frequency so far.

Roland

Telspace

21-08-2006, 21:09

Hi to all,

Today's log.

First five minutes were quite difficult. Sound good.

Denis

Telspace

22-08-2006, 21:25

Hi to all,

Today's log. Very good.

Regards,

Denis

FritzWue

22-08-2006, 21:33

A little weak today, 2 or 3 dB more would help a lot! ;)

dk8cb

22-08-2006, 22:03

Very weak in Munich today, only very little audio in the last half hour.

Roland

dk8cb

24-08-2006, 21:05

Signal was only strong enough during the last half hour. When I listened on the DRMSWR, audio was continuous.

Frequency is still too high.

Roland

Per

24-08-2006, 21:05

Hi,

Very weak here in Stockholm also. At the start of transmission, i.e. 18 UTC there was not a trace of any signal. But towards the end the signal improved. No audio though.

FritzWue

24-08-2006, 22:10

Here also best during the last half hour, frequency about 400 Hz too high.

Telspace

25-08-2006, 21:27

Hi,

Today's log.

Denis

dk8cb

25-08-2006, 21:42

Not much audio in Munich today. I only started logging after it looked a bit promising.

Roland

Telspace

28-08-2006, 21:03

Hi to all,

Today's log.
Lots of fading today.

Denis

FritzWue

29-08-2006, 23:18

Stable low SNR close to the 99% CDA limit:

dk8cb

30-08-2006, 21:10

A very weak signal for most of the time. The last 15 minutes were quite listenable on the DRMSWR. For Europe, a somewhat later transmission time might be better at this time of year.

Roland

Sixten

30-08-2006, 21:14

Hi Mathias and all.

This is first time for me ,I have sound from 21.08kbps.
Only 76% CDA, for QSB . Very good sound. Good propagation today.

:)

FritzWue

30-08-2006, 22:05

Quite good, had to leave early...

Digger

31-08-2006, 20:53

Hi,

Very weak signal here. Not worth monitoring as there was virtually no voice.

Terje

Digger

01-09-2006, 22:03

Hi,

Very little signal in the beginning. The S-meter would not even move away from zero. However, later in the evening the signal increased, but accompanied by heavy Fading.

Terje

dk8cb

05-09-2006, 21:52

I have had much better results on this frequency in the past.

Roland

Sixten

05-09-2006, 21:58

Hi all.

Very low signal from start but 1925 UTC signal go up to S7 and small sound come from speaker. SNR 15db give 40% CDA ok , SNR 16db and S9 75%CDA.
So 21kbps it too Hi bitrate, for DX reciption. So best is 14 or 17kbps.

:confused:

Digger

05-09-2006, 22:03

Hi,

I agree to the above speakers that I have seen better times too. I started the log at 1835 UT but not until an hour later I got some sporadic decoded audio. The transmission ended early, but came on air a second time just to end around 2004 UT. Honestly, why not try to reduce the bitrate? 17 kbps works fine with DW. Or, just for the matter of interest, try UEP instead of EEP? These are Test Transmissions aren't they?

Terje

mitajohn

06-09-2006, 20:24

Hi all,

Some audio from this far away station. The max signal I got was about 30dBuV with a lot of fading. I agree with your comments Digger.

John.

dk8cb

06-09-2006, 21:07

A bit more audio than when I tried last time.

But the programme during the second hour gets boring, Mauricio Ma Karthe is always playing the same titles every day. (Perhaps from his own band?) :mad:

Roland

Digger

06-09-2006, 21:31

Hi,

Not much comfort, but 5th April 2006 was even worse... :(

Terje

Digger

08-09-2006, 08:56

Hi,

The signal strength was gradually improving during the transmission. 17 kbps might help a little compared to 21 kbps over this distance. The signal faded quite a lot last night. Thunderstorms nearby in three directions did not help much either :mad:

Terje

dk8cb

08-09-2006, 20:58

The signal was just too weak.

Roland

Digger

08-09-2006, 21:17

Hi,

Looks roughly the same here in Switzerland... The signal is not strong enough. Though it is still the 8th of September here though.... :D

Terje

PS: The log says Long Wire; it should have read Ferrite Antenna 17 MHz

Digger

11-09-2006, 21:10

Hi,

Not much success tonight either...

Terje

FritzWue

11-09-2006, 21:12

Similar behaviour here, better to the end:

Sixten

11-09-2006, 21:22

Hi all.

Signal come up after 1850UTC but very bad DRM propagation.
Better signal to the end. Very strong swing in CTF give brake in sound.
See picture.

:confused:

Digger

12-09-2006, 21:09

Hi,

Better signal strength tonight. Except for a few minutes when I switched to the Long Wire...

Terje

Digger

13-09-2006, 21:04

Hi,

I think it got even better today compared to yesterday. There was very deep Fading in the beginning; after about half an hour it calmed down and some audio came through. The signal improved except for the very end, when the signal strength decreased a bit again. Quite a lot of decoded audio though.

Terje

Digger

14-09-2006, 21:05

Hi,

Seems like the conditions are improving. The last 50 minutes were quite enjoyable.

Terje

Sixten

14-09-2006, 21:15

Hi.

Very bad propagation but signal come up last 15 min. To S9.

dk8cb

15-09-2006, 21:14

I was only able to tune in for the last 20 minutes. Signal was rather weak, and I have seen better results in the past.
But there was also a weak but constant and very broadband interference signal which I notice quite often, especially on higher shortwave bands and which I have not tracked down so far.

Roland

Sixten

15-09-2006, 21:23

Hi .

This is my best log over long time.
81 % CDA from 122min , It was TX problems after 8min. So no signal under 5min.

Propagation for DRM was very good only slow QSB .

:)

Digger

16-09-2006, 07:31

Hi,

Due to my absence last night, I had to rely on a log started by the timer function in Dream. The result looks a bit like Thursday's log if you compare the plots.

Terje

Digger

19-09-2006, 06:52

Hi,

Complete silence yesterday, Monday. :confused: Holiday in Chile?

Terje

Digger

20-09-2006, 22:35

Hi,

Holiday season seems to be over, however, the very strong signal at times did not do anything good to the decoding... surprisingly bad result despite strong RF signals S9 +5 dB at times.

Terje

Digger

21-09-2006, 21:11

Hi,

Funny, S9 yesterday and S9 today and completely different. Tomorrow I'll remember to set the AGC to "slow" from the beginning and see if it makes a difference from the start. Almost 100% decoded audio after the switch to slow AGC. Quite high SNR at my place. The band was open tonight. Good conditions.

Terje

Sixten

21-09-2006, 21:13

Hi.

A weaker signal and some interference in start but after 1925 UTC, strong end stabile signal. Her is log only from 1925UTC.

Digger

22-09-2006, 21:14

Hi,

The SNR looks like yesterday but less audio tonight...

Terje

Telspace

25-09-2006, 21:05

Hi to all,

Today's log.

Denis

Digger

25-09-2006, 21:06

:( - that's all.

Terje

Sixten

26-09-2006, 07:15

Hi.

Today's log. Now is propagation very bad .

Digger

26-09-2006, 21:12

Hi,

Tonight was much better than yesterday. Compared to the 22nd Sep. the pattern looks pretty much the same. Interesting (or was it just a coincidence?)

Terje

Digger

27-09-2006, 21:07

Hi,

I allowed myself to cut out the first part with no decoded audio. The rest was quite good, but with a bigger drop towards the end. :(

Terje

Digger

28-09-2006, 21:04

Hi,

Quite bad today - or should I say tonight. 3 hops may be a bit a too big a challenge. Especially if the conditions are not too good.

Terje

Digger

29-09-2006, 21:12

Hi,

A bit better tonight. An unattended report.

Terje

dk8cb

29-09-2006, 23:14

Not good but for about two months, reception on higher shortwave frequencies here is made difficult by a constant very broadband signal that may come from some kind of in-house PLC modem. It doesn't originate somewhere in the house I'm living in but so far, I have also been unable to trace its origin. On 17660 kHz, its strength is about 4 µV.

Roland

Telspace

02-10-2006, 21:12

Hi,

Today's log.

Denis

Digger

03-10-2006, 21:08

Hi,

First try with my Yaesu FR-101. Well, the signal was not so good, but it improved gradually.

Terje

Telspace

03-10-2006, 21:31

Hi,

Today's log.

Denis

df9rb

03-10-2006, 21:32

Hi,

approx. 2 db lower SNR here in South Eastern Germany than in Switzerland.
Nearly no audio decoded here.

Bernd, DF9RB

Digger

04-10-2006, 21:12

Hi,

A late start, due to late implementation of the new DRM down mixer in the Yaesu FR-101. Anyway, better than yesterday with the things in place.

Terje

Telspace

05-10-2006, 11:38

Hi

Log of 04 Oct. 2007

Denis

Digger

05-10-2006, 21:16

Hi,

Today was completely back to front - some audio in the beginning, then complete silence. :(

Terje

Telspace

10-10-2006, 21:06

Hi,

Today's log.

Denis

Digger

10-10-2006, 21:10

Hi,

No free electrons to bounce off of.... total loss this evening here. The red curve is the FRG7700 with the Ferrite Antenna, the green curve was taken with the FR-101 and the 16 meter long wire antenna. :(

Terje

Digger

11-10-2006, 21:05

Hi,

Two logs, as I made a break for DW in the middle. First part nothing to write home about, but towards the end it picked up and the very last part offered quite a lot of decoded audio.

Terje

Telspace

11-10-2006, 21:18

Hi,

Today's log, during thunderstorms.

Denis

Digger

12-10-2006, 20:37

Hi,

Tonight was not very good. The first record (red) is the FRG7700 with the Ferrite Antenna and the second record (green) is the FR-101 with the 16 m Long Wire Antenna.

The little bit of sound in the beginning was achieved with the FRG7700. I cut the log short, as the signal faded into nothing.

Terje

Telspace

12-10-2006, 21:03

Hi to all,

Today's log,

Denis

dk8cb

12-10-2006, 21:40

Not much of a signal in Munich today.

Roland

Digger

13-10-2006, 21:10

Hi,

A rather long interruption for some reason. Later on there was quite a lot of decoded audio, but it was 0.5 sec sound, then 1 sec no sound etc. etc. until the end of the transmission

I can see no future for DX on either Short- or Medium Wave when all stations have become "digitalised" (if they ever do).

Terje