DW Sines 15440 kHz

[hsseppo]

Hi all,

Here is the first report of my new home made receiver. The receiver has AD8099 amplifier, AD9951 DDS, AD831 mixer. Antenna is a 5 meter long oudoor wire.

73, Seppo

[Per]

Hi,

Time 10:01 - 12:00 UTC.
Result CDA: 74 %.
There was strong interference from 15435 kHz starting @ 11:44.

[simone]

Hi all,
good results as usual, some interference until 1100, see attachment
73, Simone

[hsseppo]

Hi,

Yes good results, as usual this 15440 kHz in Helsinki.
12:37 - 13:57 UTC

Seppo

[hsseppo]

Hi!

Here is a report at 8:00 - 13:58 UTC. I am testing AD9951&AD831 radio to Sony ICF-2001D. Both are working well, only 1.4% difference.

Seppo

[midre]

Hi DRMs,

here are my 6 hour logfile from Sines on 15440 kHz. Quite stable signal, a short break at 1200.
Indoor reception with modified Sony SW 1.

regards, Michael

[hsseppo]

Hi!

Stable and good as usual.

8:00 - 8:59 UTC 100%

Seppo

[df8uo]

Strong and stable signal also here (Average SNR of 31 dB). Audio dropouts probably due to local effects (too high input level to sound device)
73
Daniel

[Per]

Hi,

Strong signal most of the time, but there was also interference from a carrier on the center frequency. See insert.
Time: 08:30 - 10:22 UTC.
Result: CDA 89%.

[carknue]

Hi all,

Dream is a bit too optimistic with this graph. It looks perfect, but it wasn't. Between 9:00 and 11:00 UTC I heard several dropouts caused by interference on 15440 kHz from CRI, which cannot be seen in the graph. This interfernce is known since 2 years now and still nothing happens.

[simone]

Hi all,
no problems with the usual co channel interference this morning as the signal was pretty strong, see attachment
73, Simone

[df8uo]

Hi all,

average SNR >30 dB during 170 min.

73

Daniel

[df8uo]

Hi all,

low SNR mainly due to co-channel interference in the morning.

73

Daniel

[TimoHannes]

Hi !
Yesterdays result at 08:00 - 13:58 UTC.

[hsseppo]

Hi all,

15440 kHz at 12:17 - 13:58 98%, fading and interference.

Seppo

[simone]

Hi all,
what a bad start this morning, see attachment
73, Simone

[hsseppo]

Hi all,

In Helsinki it was pretty well. At 8:15 - 8:58 100%

Seppo

[hsseppo]

Hi!

15440 kHz at 13:29 - 14:57 UTC 99%

Seppo

[df8uo]

Hi all,

perfect for 4 h (100% audio) and average SNR of almost 33 dB.

73

Daniel

[carknue]

Very bad beginning this morning. I hardly can remember such low levels from Sines. Before 8:15 there was no signal from Sines here at all. First I thought that there was a TX problem, but then the signal slightly increased to it's normal strong level.

[simone]

Hi all,
again a weak start from Sines this morning, see attachment
73, Simone

[df8uo]

Hi all,

today strong signal here the first hour.

73

Daniel

[dk8cb]

Perfect with a strong signal.

Roland

[df9rb]

Today I logged 15440 and 15545 simultaneous. 15440 with the TS850, 15545 with the Sangean both on the same antenna.
The maximum SNR of the Sangean is limited to 28 dB.

Bernd, DF9RB

[Victor]

My results for some days.

[Victor]

My results for some days.

[Victor]

My results for some days.

[simone]

Hi all,
quite stable signal this morning using the Sony SW1, see attachment
73, Simone

[simone]

Hi all,
good results for indoor reception this morning, see attachment
73, Simone

[hsseppo]

Hi all,

Average SNR 32 dB, 100% decoded at 11:44 - 14:05 UTC

73, Seppo

[hsseppo]

Hi,

strong as usual

Seppo

[hsseppo]

Hi,

Strong and stable (28 minutes),

Seppo

[simone]

Hi all,
strong signal all day but as always co-channel interference in the first two hours, see attachment
73, Simone

[hsseppo]

Hi all,

strong signal today in Helsinki. Max SNR 35 dB.

Seppo

[carknue]

Strong and perfect.

[df8uo]

Hi all,
quite strong signal as usual.
73
Daniel

[dk8cb]

As always, a strong signal without any dropouts.

Unfortunately, my receiver does not allow a better SNR but nevertheless, reception is perfect.

Roland

[dk8cb]

Hi,

as always, a strong signal but interruptions for tune-ups today.

Roland

[hsseppo]

Hi,

Strong as usual 59 minutes 99.9 CDA.

73, Seppo

[mitajohn]

Hi All,

Not bad reception in Athens. Sound very good.

John

[Baldo34]

17:15 UTC and 15440 is still on air. :confused:
73, Klaus

[mitajohn]

HI,
Reception as always. Look at log.
John

[dk8cb]

Hi,

good reception, but signal was by far not as strong as usual.

Roland

[hsseppo]

Hi,

strong and stable as usual in Helsinki, at 08:00 - 11:15 UTC.

73, Seppo

[hsseppo]

Hi,

still strong at 13:24 - 14:56 UTC,

Seppo

[mitajohn]

Hi,

For 70mins it was good but then low SNR and dropouts.

john

[mitajohn]

Hi,

I started earlier today. Not bad, but better in the last hour.
You can also see that around 11:00, although the SNR was 24dB, there was no audio.

John.

[dk8cb]

Hi,

signal these days is by far not as strong as it used to be some weeks ago but this is perhaps a result of summer conditions.

Roland

[dk8cb]

Good reception with a much better audio quality than others despite the low bitrate.
It seems, other stations do not achieve such a good audio quality even at 3 kbit/s more!

Roland

[mitajohn]

Hi,

Bad reception today. Signal lost after about 30 mins.

John

[mitajohn]

Hi,

It started good, but after 6 mins signal lost.

John

[dk8cb]

Quite good today.

Roland

[hsseppo]

Hi,
Also today quite good. 59 minutes.
73, Seppo

[carknue]

Perfect.

I wonder what caused these two dropouts? I think it was the powermangement of my notebook.

[df8uo]

Hi all,
find attached my log from this morning. In the graph there are 2 SNR curves. The reference (red) is my standard equipment (FT757GX with dipole antenna). As i have currently a DWT for testing i used the DWT with its 5 m wire supplied (just thrown the wire outside the window). The green SNR curve is the result. Tommorrow i will test both, using the same antenna.
73, Daniel

@carknue: Hi Carsten, currently i am using for parallel monitoring also a laptop. As soon as the power management is turned on (even only for the display), Dream SW freezes sometimes, when the display is switched off. I switched all power management options off, no more problems.
BTW: I am using XP Prof + SP2

@dk8cb: 2nd audio added ;-)

[dk8cb]

Originally posted by df8uo
In the graph there are 2 SNR curves.

Hi,

but where did you put the yellow graph showing correctly decoded audio on the DWT?

Roland

[carknue]

Hmm, I disabled display switching off, but the problem seems to be the dynamic CPU switching. Dream has a much higher CPU load than DRMSWR, so I need different tresholds for the DRMSWR. Does someone know a tool for fixing the Centrino CPU speed to 0.8 Ghz? I have only a tool for 0.6 and 1.6 GHz or dynamic switching.

[df8uo]

Hi all,
find attached todays result, using the DWT with my dipole antenna. Much better than yesterday using the 5 m wire antenna.
For comparison i added the result from yesterday (green/yellow).
73, Daniel

[hsseppo]

Hi all,

15440 kHz at 08:46 - 09:23 UTC at Sysmä (about 200 km north of Helsinki)

Seppo

[hsseppo]

Hi all,

next part of my report. At 12:03 - 14:59 UTC

73, Seppo

[dk8cb]

Signal was weaker than usual today.

Roland

[hsseppo]

Hi all,

strong as usual. It is amazing how stable and strong this frequency is in Finland. Over 3000 km and almost always near 100% CDA.

Best Regards, Seppo

[hsseppo]

Hi,

Dream version 1.2.4 has better bandpass filter than version 1.2.2.

Version changes reads:
" improved bandpass filter for receiver -> better interfere rejection
BUT: under normal conditions, this filter will degrade the performance a little bit since it attenuates the OFDM carriers at the borders a bit"

I was running two Dreams, version 1.2.4, the first bandpass filter OFF the second bandpass filter ON. The differency was only 0.1% during 261 minutes.

73, Seppo

[dk8cb]

Originally posted by hsseppo
The differency was only 0.1% during 261 minutes.


The improvement depends very much upon the sort of interference encountered. The improved bandpass filter is especially effective in case of interference signals that occur at the edges of the DRM spectrum.

Roland

[hsseppo]

Hi Roland,

Yes, I agree, bandpass filter is a very good option.

I wanted to know how much bandbass filter degrade the performance. I have noticed that edges of the DRM spectrum are also filtered a little. My test above shows that the filter can be ON always, as it in good conditions degrades only 0.1 %

73, Seppo

[dk8cb]

Originally posted by hsseppo
My test above shows that the filter can be ON always, as it in good conditions degrades only 0.1 %

Hi Seppo, now I understand your intentions.

The filter may always be on if CPU-load and power consumption don't play a role.
It also still has to be investigated whether the filter will perhaps have a negative effect in the presence of broadband noise pulses which might be stretched by the filter's response.

Roland

[dk8cb]

Very good until another station came on 3 minutes before the end of transmission.

Signal was weaker than usual at the beginning of my logging period but became strong towards the end.


Roland

[dk8cb]

Hi,

good reception as usual.

Roland

[dk8cb]

Perfect. Sines' signal gained 30 dB in strength during my listening period.

Roland

[hsseppo]

Hi all,

99,8% CDA. Strong signal as usual.

Seppo

[Per]

Hi,

Also here perfect result! Listening for three hours with a total of 99 % CDA.

[dk8cb]

Good reception in Munich as well but not with a strong signal, much weaker than it used to be in spring.

Roland

[hsseppo]

Hi,

good as always.

Seppo

[dk8cb]

Not a very strong signal but perfect reception.

Roland

[dk8cb]

Hi,

at about 0923UTC today, there were three short interruptions of the DRM signal which obviously were TX or data stream related.
Just before it, signal strength had fallen to a much lower level than before but this may just be related to propagation conditions.

See attached waterfall plot for a recording of the interruptions in the DRM data stream.

Could an airplane have crossed the line between the satellite and Sines' satellite dish?

Roland

[dk8cb]

Hi,

and here is my report.

Roland

[hsseppo]

Hi all,

I was testing again Sony ICF-2001D radio and my "home made" DRM-radio. At the same input level -60 dBm Sony has second order distance of IM -30 dB and my DRM-radio has -55 dB. The maximum SNR with Sony is 28 dB and DDS-DRM has 51 dB. Also I calculated DDS-DRM mixer IP3 18dBm. (1 dB mixer compression Point = +8 dBm --> IP3 = 10+8 dBm)

DDS-DRM-RX has much better specs than Sony but the result is almost the same. Strong field as this 15440 kHz results 100% both, weaker signal 18-19 dB SNR, like 7265kHz today, has the differency only 3%

73, Seppo

[hsseppo]

Hi all,

99.8 CDA, 12:30 - 14:36 UTC, max SNR 33.2 dB

73, Seppo

[dk8cb]

Just a short report.

Roland

[FritzWue]

...always a good signal:

[dk8cb]

Hi,

not as strong today as I have seen it before. A carrier could be seen right on channel quite often.

Roland

[FritzWue]

This frequency is one of my references, was stronger before, but still good signal.

[dk8cb]

Quite good again.

Roland

[dk8cb]

Hi,

quite good but after 09:32, no audio was transmitted for a period of about 8 minutes. Reception was however perfect during that time amd MSC was decoded perfectly.

Roland.

[FritzWue]

Perfect as most time, always good skip.

[carknue]

Perfect, but the impulse response had 3 peaks today, quite unusual for this frequency...

[FritzWue]

Good as always.

[dk8cb]

Hi,

signal is by far not as strong as it used to be in winter and in spring but reception is still quite good.

Roland

[FritzWue]

Not so strong today, still 100% audio.

[dk8cb]

Hi,

not really a strong signal today. There was an interruption of the DRM signal at around 08:55 UTC.

Roland

[hsseppo]

Hi,

15440 kHz in Helsinki today.

73, Seppo

[hsseppo]

Hi,

47 minutes more, at 14:09 - 14:56,

Seppo

[hsseppo]

Hi all,

Strong signal in Helsinki. 395 minutes (6h35m) 100%

Seppo

[carknue]

Also 100% here in Frankfurt.

[FritzWue]

Strong variations in SNR this morning here, only 99.9%. :rolleyes:

[FritzWue]

33.6dB 100% today

[FritzWue]

"Only" 99.9%... :(

[hsseppo]

Hi,

Again 100%, two hours.

Seppo

[dk8cb]

Signal strength went up and down a lot today.

Roland

[dk8cb]

Hi,

today, Sines' signal did not fluctuate as much as it did yesterday.

Roland

[FritzWue]

The last 30 minutes:

[dk8cb]

Hi,

as it should be.

Roland

[FritzWue]

Nice as usual, 100%, 32.3dB:

[carknue]

Perfect as usual.

[hsseppo]

Hi,

almost perfect, 99.8% CDA.

Seppo

[dk8cb]

Hi,

very good reception, however, signal strength went up and down by at least 40 dB.

Roland

[dk8cb]

Hi,

signal was strong today.
During the dropout, Sines transmitted in AM for a short time, then there was only a carrier and it looked a bit like the TX was being retuned.

Roland

[CT4RK]

Hi Roland

You listen in AM because in this transmitter we have an old DRM encoder. So the transmitter need tune first after shuttdown and at the moment the audio source from sattelite was conected. This is above 30 seconds of carrier transmission, and next shutdown and start again in DRM mode, with all the automatic tuning system stoped.
This happen, when we change the antenna, or need make other operation like maintenance. In this transmission, we had change the transmitter because the normal transmitter that send in 15440 MHz was in maintenance.

[dk8cb]

Hi,

there was occasional on-channel interference.
During moments of fading, a carrier was visible on 15440 kHz.

Roland

[dk8cb]

Hi,

again not a strong signal with occasional on-channel interference.

Looks as if the skip is sometimes a bit in favour of the far distant on-channel station.

Roland

[dk8cb]

Hi,

during the last few minutes, a very strong carrier appeared on 15435 kHz and audio could no longer be decoded.

Roland

[dk8cb]

Hi,

I have seen days with a stronger signal but it was still quite ok.

Roland

[dk8cb]

Perfect.

Roland

[dk8cb]

Hi,

at 09:10 UTC, there was a short interruption of the RF signal.

Roland

[DK3SML]

Hi,
low SNR, but good continuous signal:D

cu Michael, DK3SML

[dk8cb]

Hi,

good, as always.

Roland

[dk8cb]

Originally posted by DK3SML
low SNR....

Hi Michael,

this is most likely a problem of the receiver or one of home-made interference.
To improve it (in case of home-made interference):

- put an RF choke (ferrite toroid core) into the audio cable from RX to PC, preferably on both sides.

- prevent coupling from the mains into your receiver (again using a toroid choke).

- if you are using a "Wall wart" power supply, make sure, its rectifier diodes are bypassed for RF by 10 nF capacitors.

- have a look at this old thread
http://www.drmrx.org/forum/showthread.php?&threadid=869.

Roland

[Per]

Hi,

The ever reliable Sines and 15 MHz!
Three solid hours, with start at 08:00 UTC.

[hsseppo]

Hi,

Yes, 15440 kHz is stable and strong. 15435 kHz (Saudi Arabia) was also very strong killing carrier index 0-20. 15435 kHz was about -50dBm. My radio can handle levels -40 dBm to -130 dBm at antenna input. (6 mVp-p - 0.2 uVp-p)

73, Seppo

[hsseppo]

Hello All,

Sines 15440kHz was perfect again in Helsinki. SNR max. 36.9 dB. CDA 99.9% at 8:30 - 14:56 UTC.

Seppo

[dk8cb]

Just a short report.

Roland

[dk8cb]

Strong signal, however, during moments of selective fading, an on-channel carrier could sometimes be seen on the spectrum display.

Roland

[FritzWue]

Today's log, good signal as always.

[dk8cb]

Strong signal but also fast and deep fades.

Roland

[dk8cb]

Hi,

an unusually weak signal at the beginning. Signal later gained strength but there was still fast fading of the selective as well as the non-selective kind.

Roland

[Digger]

Hi all,

Wonderful reception today.

73 de Terje

[hsseppo]

Hi,

Strong signal in Helsinki, too. 100% audio. Max. SNR 35.6dB

Seppo

[dk8cb]

Hi,

at times, signal was a bit weaker than usual. At the end of my logging period, an on-channel carrier was often visible, especially during moments with selective fading affecting the centre frequency of the DRM signal.

Roland

[Andreas]

just perfect today!

Andreas

[df8uo]

Hi all,
attached my log from today, trying the max SNR to get with a different modification of my FT757.
73, Daniel

[Digger]

Hi all,

Here is my log from around 0947 UTC and two hours onward. I wonder what mods Daniel has made to his RX?... I got a stable 32 dB SNR for most part of the logging.

73
Terje

[dk8cb]

Hi,

there were two interruptions in the transmitted stream, one at 08:23 UTC, the other about a minute later.

Roland

[FritzWue]

Good signal:

[dk8cb]

Signal strength went up and down a lot today.

Roland

[Andreas]

Hi !

Excellent results here once again.
:)

Switching over to 15265 kHz meant but a loss of 1.2 dB only (see short logfile there).

73, Andreas

[dk8cb]

Hi,

signal in Munich was much weaker than usual today and an on-channel carrier, presumably another far-away AM station, could often be seen on the spectrum plot.

Roland

[dk8cb]

Hi,

today, there were interruptions and switching between normal, Celp+ and Journaline services, so the plot looks strange.

Roland

[CT4RK]

Hi all
Yes! We are testing between 2 transmitters, and also testing the signal input at differents formats.

[Digger]

Hi all,

I noticed the interruptions and started logging just after 9 UT. Here my log for today's segment.

73 de
Terje

[Per]

Hi,

Today I noticed that DW was broadcasting in stereo. Plus DW Slideshow and DW-WORLD.DE

Two large interruptions; 09 and 10 UTC!

[dk8cb]

Hi,

voices on this stereo transmission sounded perfect, quite unlike on DW stereo transmissions from Taldom. I have posted comments on Taldom's voice stereo quality several times but no one seems to want to comment. Do a lot of people listen on crappy PC speakers where one just doesn't notice?

Reception was perfect until shortly before the end of transmission, when a much stronger arabic station appeared on 15435 and killed everything.

Roland

[hsseppo]

Hi all,

There was a 5 minute test of 3000 frames/min at 09:00. Average SNR 31dB.

73, Seppo

[Per]

Originally posted by Per

Two large interruptions; 09 and 10 UTC!

The interruptions being dual language news casts; CELP.

[df9rb]

Hi all,

I received 15440 (1st graph) and 15545 (2nd graph) with two receivers sharing the same antenna.

Bernd, DF9RB

[df9rb]

Hi all,

stable like a local station.

Bernd, DF9RB

[Sixten]

Great reception in Sweden today!

I get more than 30db out of the signal with my IC-R70 and home made DRM IF + 12Khz Mixer. My S-meter peak S9+30dB

Like SUPER loka FM sound.
Update my DRM web.
http://web.telia.com/~u85910238/DRM_screen_dumps_SM5DAJ.htm

[iw0hk]

Hello,
here is my "fm-style" reception of DW in Roma Italy,

Wishes, Andrea

[FritzWue]

Strong fluctuations and low fieldstrength during my saturday morning shopping tour with four stops that you can see in the diagram. There was always some interference or a roof where i found a parking place.
The long dropout occured when parking in front of a shop with high power low voltage illumination.

[Sixten]

Hi all .

Her is my super report from DW my S meter swing from S8 to S9+30Db.


Her is my log from last 55 min. to DW stop transmission.

[Digger]

Hi all,

At 0800 there was no SDC or MSC, but the SNR was OK. Just after a quarter past 8 UT they found the modulation knob ;) . The signal was not as strong a usual, the Channel Impulse Response was one distinct impulse and the SNR was about 23 dB. Usually I record up to >30 dB, perhaps it is "weather" related...

Enclosed is the report over one hour until 0909 UTC.

73
Terje

[Digger]

Hi all,

Super reception again today.

73s

Terje

[FritzWue]

Essen center - B224 - A02 - A31 - 48712 Gescher

Good reception starting downtown Essen driving home.

For comparison see reception the same way in the other direction on 1440kHz mediumwave:
http://www.drmrx.org/forum/showthread.php?s=&postid=20756#post20756

[hsseppo]

Hi,

A strange thing happened today at 08:56 UTC. Sines was very strong, max. SNR 37.7 dB but suddenly a very strong 15443kHz carrier wave killed DRM completely. The other signal was fading 10 to 30 dB over the Sines transmission. I just don't understand where it came from. I was not able to find any image or harmonic frequencies of my receiver suitable to this carrier wave, so I think it was really very a strong 15443 kHz carrier. Did anybody else noticed this interference?

73, Seppo

[FritzWue]

Good results from 48135 Muenster to 48712 Gescher:

[Digger]

Hi,

Very good reception as most of the time on this frequency from this direction.

Enclosed is the log for one hour from 1150 - 1300 UTC.


Terje

[carknue]

Perfect results with DWT. But Dream is very tolerant in logging;)

[Digger]

Hi,

Roughly the same segment here in Switzerland: See the enclosed log...


Terje

[carknue]

Seven hours of perfect indoor reception with the DWT. But DW should improve the sound quality. I would suggest Mode A with 23.6 kbps. Should work fine with such a strong and stable signal.

[Digger]

Hi,

15 MHz is very good from Sines at my location.

Terje

[Per]

Hi,

Also at my location 15 MHz from Sines gives, as usual, a very good result. But what happend at 08:51 UTC?

Text msg "Mehr Infos unter: www.dw-world.de/drm"

[hsseppo]

Hi,

15440 kHz was strong and stable as usual. 170 minutes 100% There was at the same frequency 15440 kHz AM-modulated carrier wave fading +-10 dB over the DRM wave killing some of the center DRM carriers, but still 100% audio was decoded. DRM is really working very good!

Seppo

[FritzWue]

Going from 48712 Gescher to 40477 Duesseldorf center:

[carknue]

5 hours perfect reception with DWT.

[Per]

Hi,

95 minutes of excellent reception!
DW & 15 MHz = perfect DRM.

[simone]

Hi all,
some interference but no problem with the DWT and indoor loop antenna
Simone

[Digger]

Hi,

A short log - tuned in too late... But perfect.

Terje

[carknue]

Once again perfect with DWT and indoor loop.

[dk8cb]

Very good until an extremely strong AM station came on on 15435 kHz shortly before the end of Sines' transmission.

Roland

[df9rb]

Comparing indoor-antenna (Degen SW-Loop, 2nd graph) with my outdoor-antennas.
1st graph:
first 10 minutes EWE - Degen is better!
next 15 minutes ALA1530
till the end 3 ele Ham Yagi

Bernd, DF9RB

[mitajohn]

Hi all,

This is a result after my last ones about 5 months ago, when I stopped logging on this frequency due to bad reception caused by weak signals and interference problems.
Today the signal seemed enough strong but with deep fading.
Interference started towards the end which got worst at the end of the log. See attachment.

John.

[carknue]

Again perfect results with DWT indoor. The problems at the begining could have been Notebook related.

[FritzWue]

Also good mobile results.
Driving from 48155 Muenster to 48712 Gescher with a 15min stop in the middle.
Shortwave is much better for mobile reception than mediumwave.
To the end problems with a strong carrier 5kHz down.

[Digger]

Hi,

Either the conditions went haywire or some carrier is present on this QRG after 0900 UTC? Usually this frequency offers super DRM reception...

A short log clearly shows the problem.

Terje


PS: The interference was gone by 1000 UTC

[Digger]

Hi agn,

Much better after 10 UTC. :)

Terje

[Baldo34]

Hi all,
very bad audio quality with 11,6 kbps.
AM sounds much better !
:mad:

73, Klaus

[carknue]

I also noticed very low bitrates on all DW frequencies this morning. If this will continue, I surely will not buy a DRM Radio. I think that even 17.4kbps p-stereo sounds not really good enough for a programme with high part of music like DW digital. Should be around 20kbps p-stereo or 17.4 kbps mono.

[CT4RK]

Hi all DRMs

In acordance with the new schedule Sines will be on the air in 15.440KHz from 08:00 to11:57, and from 12:00 to 13:00. All UTC of course.
About the sound quality, I was print your msg to send it to DW in Bonn, We in Sines Have no action in the BR , because the signal send from Bonn, in MDI format, have all parameters.

73 from CT4RK

Sines - Portugal

[Baldo34]

Hi Carlos,
according to the DW schedule 15440 is on air from 0800-1359. Is that correct?
73, Klaus

[CT4RK]

Hi Baldo

Yes is correct. I was post the information wrong. Sorry!
Efectivelly the 15.440KHz are from 8:00 to 13:59.:D

[hsseppo]

Hi all,

just a short report of 14.56 kbps bitrate mono audio. The audio quality was surprisingly good, definately much better than AM. The audio band was up to 5 kHz. My opinion is that this kind of audio quality is good enough for the short wave reception. I prefere a 100% decoded audio with lower quality better to a 89% decoded high quality stereo audio. If the decoded audio is less than 90 % I normally stop listening.

73, Seppo

[Digger]

Hi,

Here is an unattended report. One break was mentioned by Carlos, what was the other?

Good result, anyway.

Terje

[hsseppo]

Hi,

15440 kHz strong and stable as usual.

73, Seppo

[Owdjim]

15440 kHz is providing some very good reception at times here in New Zealand. See my example log from last night. 17700 is also quite good sometimes.

Cheers, Chris

[mitajohn]

Hi all,

A very good result for 50 mins.

John

[Owdjim]

Hi All

15440 kHz is providing very good reception here tonight, once China left the frequency. Journaline & Slideshow both decoding ok. Using DRT1.

Cheers, Chris

[hsseppo]

Hi all,

126 minutes of 15440 kHz, 99.5%

Seppo

[hsseppo]

Hi,
just a short report, 32 minutes.
Seppo

[maxpower]

Hmm, its a little bit of-topic, but i think it would be a good idea to place some internet-controlled receivers in the target areas and change the bitrates comparing to the live-reception results of the test-receivers automatically. so everyone could get a good realiabilty and the best sound quality for a given daily propagation.
Are there plans to do something like that?

Stephan

[dk8cb]

Originally posted by maxpower
... i think it would be a good idea to place some internet-controlled receivers in the target areas and change the bitrates comparing to the live-reception results of the test-receivers automatically. so everyone could get a good realiabilty and the best sound quality for a given daily propagation.

Such a system has already been used, it is known by the name of QoSAM (Quality of Service - AM). Have a look at this website (http://www.ist-qosam.com/start.htm). However, a signal may be received well at one location and bad at another or there may be interference at one place and a free channel at another.

Roland

[maxpower]

oh, yes. now i remember! but what have been the results? Did it work?and when, why isn't it used?

Sure i know there are more problems at shortwave than propergation. indeed in my opinion co-channel interference is the biggest problem of the drm-system. but thats another thing which you can only solve by using another frequency or - what i think would be better - drm only frequencies, like many dxer's want in order to lower drm-qrm on the analog bands. But that would be an itu issue.

stephan

[Owdjim]

Hi All

Excellent reception on 15440 kHz from 1100 to 1200 today. Full decoding of Journaline & Slideshow too. DRT1 receiver.

Cheers, Chris

[mitajohn]

Hi all,

A very good result to day.

John.

[mitajohn]

Hi all,

A pretty good result using DE31. See for yourself the log.

John.

[simone]

Hi all,
DW were broadcasting text messages in several languages, here is an example with the Arabic characters using DReaM, looked nice although I have no idea if it is correct or not ;)
Simone

[Per]

Hi,

No extra services today. Reception improved after 09:30 UTC.
Listening time: 09:05 - 10:21.
Result CDA: 92%.

[FritzWue]

Driving south from 48712 Gescher via A31-A2-A3.
Stopped listening near Duisburg because the sound quality was a pain in the ... ears. :rolleyes:
This was definetively not good enough for car stereo.

[stegewicht]

Hello,

a reception-report for 15440kHz DW.

regards
Mike

[mitajohn]

Hi all,

Here is a result for 50 mins.

John.

[midre]

Hi DRMs,

Sines on 15440 kHz, - perfect as usual!

regards, Michael

[FritzWue]

Driving from Muenster to Paderborn via Ahlen.

[feinstei]

Perfect reception (17.5 dB) with no dropouts whatsoever in Detroit, Michigan USA at 13:15 UTC on 21-December-2005. English language newscast.

Fredric E.
N8UC - Detroit, Michigan USA

[df8uo]

Hi all,
attached the result of this morning using two different radios. FT757 and outdoor antenna (blue/red curve) and my small SONY SW1 using only the integrated antenna (yellow/green)
73, Daniel

[FritzWue]

Driving from 48712 Gescher to Bochum via A31, A2, A43, A40.
Strong signal even in the tunnels, but sometimes an AM carrier right ontop of the signal although all clear 10kHz up and down.

[FritzWue]

Driving from Bochum to Essen on the A40, perfect!

[mitajohn]

Hi all,

A good result for 30 mins, then reception turned to very bad.

John.

[hsseppo]

Hi,

almost perfect, 48 minutes report.

Seppo

[mitajohn]

Hi all,

A very good result for about 20 mins today.

John.

[simone]

Hi all,
a weak and interfered signal this morning, don´t remember when I ever had such bad results on this transmission.
Simone

[sveron]

Hi,

Good results especially at the end of the reception despite lower audio quality during the music programme, but nice anyway... Slide show received 15 times between 11:00 and 12:10 UT. Logged with laptop connected to AC adaptor.

73, de Stephane

[Per]

Hi,

158 minutes of perfect reception! The Tx left the air at 11:56 UTC, to return at 12:00.

[carknue]

Perfect reception. SSP. Only interruptions due to mode changes.

[mitajohn]

Hi all,

A result for 60 mins today.

John.

[df8uo]

Hi all,
attached my result from this morning. Signal quite strong as usual.
73, Daniel

[Sixten]

Hi all.

My report from 030206 very strong signal S9 and slow QSB.

[Digger]

Hi all,

Good signal, perfect except for the interruption from 1336-1340 UTC, which did not show up on Sixten's graph...


Terje

[Mitsuru Ito]

I got few secs audio at first time.
SNR was less than 15dB.
Other comrade can get 20dB SNR in Tokyo.

[Digger]

Hi all,

Good as always. Interesting to see that the signal even goes all the way to my old QTH during the 80's - hi.

Terje

氷山

[Sixten]

Hi all.

Now is my best log her.

85 min and 99% CDA ok.
Antenna is now on the table on:) my altan.

[Digger]

Hi,

An hour plus with perfect reception.

Terje

[carknue]

Perfect, but why is this break? Bitrate after the break is not changed.

[carknue]

When should this transmission start? It is scheduled for 8 UTC, but not this morning:confused: There was a weak signal between 10 and 11 UTC.

[CT4RK]

Hi Carsten

this transmission is on air between 9:00 and 11:57 UTC. The propagation is the major problem. In the last month I had discovered a day with a ZERO SSN. So, no storm from sun but also no black spots in the sun, and no propagation. During the last 15 or 20 days MUF was realy lower than normal, and only a few hours a day are close to 15MHz. Normaly is around 7/9 MHz at night hours. In the last days, across the SW band I only listen a few and weak broadcasting stations in lower frequency segments. Also in Ham bands , in 14 MHz around 12:00 to 15:00 UTC we can listen stations , but normally from USA. Nothing from Europe.

[Digger]

Hi Carlos and all,

A very good day today except for a sudden drop in the signal strength around 1000 UTC ± 10 minutes. See plot for further comments.

Terje

[carknue]

Hi Carlos and all,

Very strange thing happend yesterday. After the usual 5 min break, the signal strength was 15 dB lower, but no change in SNR:confused:.

Carlos, what is changed after this break at 11:55 UTC? Transmitter change?

No change today.

[Digger]

Hi,

Very weak with co-channel AM QRM inthe beginning, then good until about 1050 UTC, when the signal got weaker again, with AM on the same QRG.

Terje

[CT4RK]

Hi Carsten

I was not in the station in this hour, because, this week I´m working from 16:00 to 24:00, but I today I was asked about this and the drop in the signal was caused by antenna change, from a courtain antenna to a log periodic vertical polarized antenna, because the workers that are assembling the new courtain for 4 MHz band, was closed to the courtain antenna that normaly running 15440 KHz.
But the propagation is also so bad. Today, I my yaesu FT1000MP MKV worked like no antenna conected!...No signals, no noise, nothing...A strange silence along all Ham bands. One Ham station was arrived on 7085 KHz from North Spain strangely strong, (45 dBuV) runing 1 KW. I called this station EA1PL, and make a bilateral contact with a strong signal. ( I run also a Kw). But the starnge is no more stations I can heard in SW band...:confused:
We are realy in "zero ground" of 11 years cycle.For almost the entire month of February 2006 the sun was utterly blank. If Galileo had looked at the sun on his 442nd birthday, he would have been disappointed—no sunspots, no spin, no discovery.:(

Looks what says SpaceWeather about the propagation:

What's going on? NASA solar physicist David Hathaway explains: "Solar minimum has arrived."

Sunspots come and go with an 11-year rhythm called the sunspot cycle. At the cycle's peak, solar maximum, the sun is continually peppered with spots, some as big as the planet Jupiter. But for every peak there is a valley, and during solar minimum months can go by without a single sunspot.

"That's where we are now—at minimum," says Hathaway.

Actually, we're at the beginning of the minimum. February 2006 was the first month in almost ten years with mostly no sunspots. For 21 of February's 28 days, the sun was blank. Hathaway expects this situation to continue for the rest of 2006:(
Have a nice weekend.

[Per]

Hi,

Well, I believe it's the propagation that is "playing". Or what caused the drops between 10:31-10:50. But what happend at 11:58?
Nice otherwise with the stereo signal. Listening time: 09:55 - 12:21 UTC. Result: 75.5% CDA

[simone]

Hi all,
pretty good results for an hour today
Simone

[carknue]

Quite weak this morning, but OK after 30 minutes.

[Digger]

Hi,

China Radio International came on just before 09 UTC, but its signal was not so strong (for a change :D ), but enough to interfere. Otherwise good reception all through.


Terje

[FritzWue]

Driving from 48147 Muenster to 49661 Cloppenburg.
Good signal! :D

[df8uo]

Hi alll,
almost 2h perfect. Light interference, which could not really harm the reception.
73, Daniel

[carknue]

Weak and instable this morning.

[Sixten]

Hi all.

Log over 70min to day.

[simone]

Hi all,
no DRM signal before 0930 (schedule change?) btw nop signal on17700 kHz either, bad conditions again this morning
Simone

[FritzWue]

Driving from Muenster to Osnabrueck:

[FritzWue]

Driving in Muenster, NRW:

[carknue]

Strong and stable all the time.

[carknue]

Perfect, but signal strength drop in the last 30 minutes:confused:

[Mitsuru Ito]

hi all,

The signal of DW 15440KHZ was docorded good in Japan.
I received DW at 12HRS first time.

[dk8cb]

Strong signal, good reception, much better reception than on 15265 kHz which suffered heavily from a strong on-channel carrier when I checked at 13:30 UTC.

Roland

[Digger]

Hi,

Strong and stable signal here. Perfect, I would say.
Higher SNR on all DRM stations after some more work on my FRG 7700.


Terje

[Mitsuru Ito]

hi all,
The signal was good decord today.
I guess after 1hr it will be better than this.
Thanks 73s
DE JA2QDX M.Ito

[Digger]

Hi,

The conditions were good today too. The improved SNR is credited to running the FRG 7700 on an external DC Supply instead from its built-in 230 VAC transformer and rectifier. Up to 5 dB better SNR than previous logs.

Terje

[Digger]

Hi,

A bit jumpy today, but on average very good. CDA was almost perfect, Fading probably was the cause of the variation in SNR.


Terje

[Digger]

Hi,

Very interesting! A very weak signal, just after 09 UT the S-meter went down to S0 - S1. S1 is approx. +6 dBµV into the antenna terminal. The Channel Impulse Response remained very distinct, and there was decoded audio even with periods of S0. I believe the reason for the weak signals was the C9.7 solar flare at 08 UT :confused:

An hour long log with some comments is enclosed.


Terje

[Mitsuru Ito]

hi all,
DW was dcorded few mins .
The signal was not so strong.

[Digger]

Hi,

PERFECT! :)


Terje

[carknue]

perfect too.

[Digger]

Hi,

Again perfect, but slightly lower SNR than yesterday.


Terje