DW Wertachtal / Sines 3995 kHz [Archive] - Page 2

4S7DRG

28-03-2005, 02:29

Hi all,

pls. find attached the DW transmission monitored for almost an hour. Recection was possible up to shortly after sunrise here.
Nevertheless impressive for abt. 8000 KM distance and coming
from a non directional antenna.

dk8cb

28-03-2005, 14:15

Hi,

here is a report from a location just 60 kms from Wertachtal using just a telescopic antenna and some wire connected to receiver ground as a counterpoise.

Perfect reception.

Roland

4S7DRG

30-03-2005, 02:56

Hi all,

pls. find attached 30 min. of DW transmission on 3995 khz.
Once the sun rises the signal goes down.
Audio decoding is mainly possible with an SNR as low as 10 dB.
Signal strength was S5..7 only, during above time monitored.

This is a great improvement on the TX encoder end, compared to 1 year ago. There we needed roughly 15 dB SNR for a similar result.

warm regards from very hot Sri Lanka

simone

06-04-2005, 09:38

Hi all,
some results using the portable Sony/ telescopic antenna indoors this morning
73, Simone

PaulT

16-04-2005, 00:54

Hi,

I've noticed for some time now that the DW 3995 transmission does not have the station label. Well at least it doesnt when using Dream (1.2.2.) observed at 23.30utc onwards. The bit rate display also displays 0.00kbps when the msc / i/o leds toggle. All the other leds are green. I have not observed this with any other station transmissions, I thus suspect this is a transmission probelm. Any ideas anybody?

PaulT

16-04-2005, 01:05

Hi Guys

Subsequent to the bite rate change at 24h00 reception is perfect with id label. I note that the protection level has also changed?

Paul T

carknue

24-04-2005, 16:10

This really strange DRM frequency gave a new riddle to me last night. The overall performance of this frequency seems to be much better now than it used to be in winter. But what happened at 23:57 and 4:15 UTC? The other strange thing is, that it started with a transmission from Wertachtal and it ended in the morning with Jülich. When is the switch and what mode was used between 23:57 and 4:15 and from which TX.

mitajohn

09-05-2005, 00:08

Hi all,

Here's the today results from DW 3995 kHz.

John

mitajohn

22-05-2005, 01:47

Hi all,

Here's the today's results for DW 3995 kHz using the whip aerial of the Rx. Taking into account the close proximity of the Rx to noise sources (PC, Monitor, UPS...) the result is not so bad.

John

mitajohn

24-05-2005, 03:18

Hi all,

Here's the tonight's results for DW 3995 kHz. Almost perfect, but low SNR. Although audio decoding was correct at 99.4% no audio breaks noticed. The sound was smooth but LoFi due to the low BR.

John

carknue

29-05-2005, 23:02

Perfect on this early hour.

Janucha

05-06-2005, 23:29

DW in Poland today - reception results

simone

10-06-2005, 12:18

Hi all,
here is my report for last night, some problems between 1900-2100, quite good during the night using the lower bitrate, see attachment
73, Simone

carknue

12-06-2005, 00:11

Never saw such a strong and stable DRM signal before. Quite impressive. They should use higher bitrates in summer, because this frequency seems to work much better now.

simone

13-06-2005, 15:54

Hi Carsten and all,
what a difference to the nights before!
73, Simone

mitajohn

14-06-2005, 05:48

Hi,

Here is an overnight log on 3995.

John

simone

15-06-2005, 20:07

Hi all,
here is last night´s report, conditions have improved again.
73, Simone

dk8cb

19-06-2005, 00:22

Hi,

100% audio at 61 kms distance from the transmitter.

The impulse response was always long. Sometimes, the peaks had almost equal amplitude.

Roland

mitajohn

19-06-2005, 08:14

Hi all,

Here is the last night´s report, not a good one.

John

mitajohn

27-06-2005, 05:40

Hi all,

This is a partially unattended overnight reception log of DW 3995.
Txs with much less power perform much better.

John

simone

01-07-2005, 16:19

Hi all,
good results last night but from 0600 this morning many dropouts, see attachment
73, Simone

mitajohn

02-07-2005, 09:35

Hi all,

This is a partially unattended overnight reception log of DW 3995.

John

mitajohn

03-07-2005, 09:24

Hi all,

The usual unattended overnight reception.

John

dk8cb

03-07-2005, 22:17

Hi,

quite good reception, the two dropouts were the result of a too long impulse response.

After the mode switch, the audio bandwidth of just about 3 kHz is too low!
I don't understand, why it's AAC with 12 kHz sample rate but with only 3 kHz audio bandwidth.

Roland

mitajohn

04-07-2005, 06:17

Hi all,

This is a partially unattended overnight reception log of DW 3995. A quite better result than the previous ones.

John

FritzWue

04-07-2005, 13:16

Multiple impulse reception, so some dropouts.

FritzWue

05-07-2005, 08:33

Something was switched just before 06:00 UTC.
Here reception was worse after this.

df8uo

05-07-2005, 17:42

Hi all,
find attached my result from last night using DWT plus dipole. I donot know from where these riple on the audio frames curve comes from?
73, Daniel

FritzWue

06-07-2005, 22:56

Good reception tonight:

FritzWue

08-07-2005, 06:36

The same, even with the wrong antenna in the wrong direction.

mitajohn

08-07-2005, 06:40

Hi all,

Another unattended overnight report on DW 3995.

John

dk8cb

09-07-2005, 11:25

Perfect.

Roland

simone

10-07-2005, 08:02

Hi all,
not so great last night, see attachment
73, Simone

dk8cb

10-07-2005, 22:03

Hi,

reception was good today until the delay had risen to such a large amount that audio dropped out a lot.

Roland

FritzWue

12-07-2005, 08:11

Something was switched just before 06:00 UTC.

FritzWue

13-07-2005, 15:37

Same today:

FritzWue

14-07-2005, 14:50

Something went wrong up there today, very bad reception after someone switched off the condx.

simone

14-07-2005, 22:59

Hi all,
good results using the DWT and telescopic antenna this evening, see attachment
73, Simone

FritzWue

15-07-2005, 07:20

All back to normal again this morning:

FritzWue

17-07-2005, 07:52

Very good in the morning at this time of year.

simone

17-07-2005, 10:13

Hi all,
not bad last night using the DWT, see attachment
73, Simone

mitajohn

18-07-2005, 05:53

Hi all,

Another semi-unattended overnight report on DW 3995.

John

FritzWue

18-07-2005, 09:39

Last night I was in the dead zone. After the switching at 06:00 UTC the peak SNR values were higher, but there was a lot more variation.

dk8cb

24-07-2005, 14:24

Hi,

there was a period when the impulse response became long. There was no interference and the signal was strong but the long IR caused a few dropouts.

Roland

simone

24-07-2005, 15:39

Hin all,
quite good results last night until 0800 this morning using the DWT, see attachment
73, Simone

dk8cb

24-07-2005, 21:05

Hi,

over here, at a comparably short distance to the TX site, the impulse response is already getting long early at night which causes a few dropouts.

Roland

df8uo

27-07-2005, 06:47

Hi all,
quite good result last night from 22h00-5h00
73, Daniel

simone

27-07-2005, 17:09

Hi all,
good results last night until 0600 this morning, see attachment
73, Simone

simone

27-07-2005, 17:09

Hi all,
good results last night until 0600 this morning, see attachment
73, Simone

dk8cb

27-07-2005, 22:26

Hi,

towards the end of my logging period, the impulse response became long and caused some dropouts. These continued to happen even after the bitrate change, albeit a bit less severe.

Roland

df8uo

28-07-2005, 17:06

Hi all,
conditions last night not as good as the night before.
73, Daniel

dk8cb

30-07-2005, 15:14

Hi,

a few problems that were caused by a long impulse response.

Roland

dk8cb

30-07-2005, 22:12

Hi,

at times, the IR was a bit long and had its effect on the SNR.

Roland

df8uo

31-07-2005, 11:04

Hi all,
last night 23h00-5h00 almost perfect.
73, Daniel

FritzWue

02-08-2005, 07:03

Very nice this morning:

FritzWue

03-08-2005, 06:55

Last night's log:

DK3SML

04-08-2005, 19:42

Here is my first report of receiving a DRM transmission: the DW program on 3995 worked very well in the early evening today.
I've got a new Antenna, its a 6,3m long groundplane without radials for HAM-radio. The receiver is a WINRADIO 303e. The interruption of the red SNR-line (.png file) is caused by the computer, its in real without any break ;) funny in the posting it's ok....

vy 73, Michael

dk8cb

06-08-2005, 23:22

Perfect.

Roland

FritzWue

08-08-2005, 08:17

Sad but true:
At the moment this is the only DRM signal I can listen to when getting up at 06:30 local time in the morning. :(

DK3SML

08-08-2005, 18:34

Hi,
very good log in the soon evening today..no dropouts and a good SNR.

vy 73 Michael, DK3SML

FritzWue

09-08-2005, 07:49

OK this morning. The big dropout was caused by switching something at the TX site.

dk8cb

10-08-2005, 22:23

Quite good with a single dropout during a moment of fading. Signal at 61 kms distance to Wertachtal went up and down in strength quite a lot by as much as 40 dB.

Roland

FritzWue

11-08-2005, 11:35

A longer log:

dk8cb

12-08-2005, 22:17

Today, I tried my receiver's whip antenna for a change.

Roland

dk8cb

14-08-2005, 00:40

Hi,

there were a few moments when the impulse response didn't look good. During those moments, the spectrum looked perfect and there was no visible interference.

Roland

carknue

14-08-2005, 16:09

Total loss of audio in the night, even at very low bitrate. Quite interesting is the drop of 5 dB SNR from 7:30 in the morning. Maybe SFN or switch to Jülich?

dk8cb

14-08-2005, 22:02

Perfect.

Roland

simone

15-08-2005, 16:33

Hi all,
perfect last night, most of the time a higher bitrate would have been no problem
73, Simone

FritzWue

24-08-2005, 07:15

From telefone to radio:
:rolleyes:

FritzWue

25-08-2005, 12:38

Just log, did not listen to the telephone, looks good:

dk8cb

27-08-2005, 10:30

Hi,

good reception, but with autumn conditions coming, one can already see lengthening of the impulse response. So far, however, it does no harm yet.

Roland

dk8cb

27-08-2005, 21:15

Hi,

currently, listening to this transmission is no fun. The impulse response looks rather bad and there are many dropouts, see the attached history plots.

Roland

dk8cb

27-08-2005, 21:18

And here is the log.
Perhaps I am really too close to Wertachtal.

Roland

dk8cb

29-08-2005, 20:24

Not bad this morning.

Roland

simone

30-08-2005, 16:35

Hi all,
another quite good overnight report, see attachment
73, Simone

mitajohn

31-08-2005, 07:21

Hi all,
There were better overnight reports, see attachment
John

mitajohn

01-09-2005, 06:54

Hi all,

This is a better unattended overnight result than yesterday's, see attachment.

John

mitajohn

03-09-2005, 09:05

Hi all,

A very good result for 4 hours, see attachment.

John

Digger

06-09-2005, 08:29

Hi all,

Deutsche Welle on this frequency is usually very stable at my location. The enclosed report verifies this. However I wonder what happened at 06 UTC? Was there perhaps a change in transmission mode?

73
Terje

mitajohn

11-09-2005, 08:27

Hi all,

A very good result for 6 hours tonight, see attachment.

John

FritzWue

11-09-2005, 23:53

Bad result here today.
First problems with impulse response due to bad condx, then telefone quality not worth listening to.
Classical music and 11kbps, what a nonsense!

Digger

12-09-2005, 13:41

Hi all,

This morning the bit rate was 17.46 kbps and the SNR was not as high as it used to be.

Enclosed my log for 40 minutes in the morning until 0645 UTC.

73
Terje

Digger

13-09-2005, 08:14

Hi,

This morning the conditions were nothing to write home about. Both 6 and 7 MHz almost completely dead. Logged DW here from 0540 UTC till 0700 UTC. Except for an carrier interruption just before 0600 UTC the reception was stable. The broadcast was in Stereo. Enclosed is my log.

73

Terje

mitajohn

14-09-2005, 07:29

Hi all,

A rare occurrence happened, a very good result for almost 8 hours tonight, see attachment.

John

mitajohn

17-09-2005, 08:19

Hi all,

This is another overnight good result, see attachment.

John

mitajohn

19-09-2005, 07:57

Hi all,

This is another overnight not so good result, see attachment.

John

simone

20-09-2005, 16:51

Hi all,
bad results last night, but perfect this morning
73, Simone

simone

21-09-2005, 20:42

Hi all,
perfect after a weak start this morning, see attachment
73, Simone

Digger

22-09-2005, 10:47

Hi all,

Quite good this morning. The dropout at 0600 UTC was caused by an interruption in the transmission.

Terje

PS: Notice the same dropout at 0600 UTC in Simone's log from yesterday.

Digger

23-09-2005, 08:06

Hi,

Nothing more to add from yesterday - just - very good.

Terje

mitajohn

27-09-2005, 07:10

Hi all,

This is the overnight result on 26/Sept/09 (2nd graph) compared with a better one, see attachment.

John

Digger

27-09-2005, 16:01

Hi,

How come that the carrier was strong, but the SNR was terrible until 0515 UTC, when the SNR jumped to >20 dB? :confused:
I think I have seen this in previous logs as well. Anybody got a clue? (I. e. see Carknue on 14th Sep. 2005).

Terje

Digger

28-09-2005, 17:12

Hi

An hour's log from 0600 - 0715 UTC this morning. Quite stable conditions now when the Sun is quieter.

Terje

FritzWue

28-09-2005, 19:05

Good in the car now also from 45326 Essen to 48712 Gescher:

Digger

29-09-2005, 11:05

Hi,

During the last 6 1/2 minutes the reception deteriorated drastically although I would say there was sufficient signal strength. Enclosed the 4 hour report from this morning.

Terje

carknue

01-10-2005, 13:06

Here is a night log with DWT. Extreme signal improvement at 5:30 Utc. Local sunrise was at 5:24 UTC, maybe there is a relationship.

mitajohn

03-10-2005, 06:59

Hi all,

This is a good overnight result for this area.

John

simone

03-10-2005, 08:19

Hi all,
another overnight report using the DWT, quite good except 0440- 0500, see attachment
Simone

mitajohn

04-10-2005, 06:44

Hi all,
Another overnight report, quite good except for the big drop which I don't know the reason, see attachment.
John.

Digger

04-10-2005, 11:02

Hi

Here is a report from this morning. Unfortunately, I forgot to press the the log button at 0530 UTC... Noticed a couple of times that there is always a change "of something" at 06 UTC. Anybody knows exactly what DW does? :confused:

Terje

mitajohn

05-10-2005, 08:00

Hi all,
Another overnight report, quite good result, see attachment.
John.

Digger

05-10-2005, 20:17

Hi,

Just about a half hour from this morning. It was very good, as most of the time.

Terje

mitajohn

06-10-2005, 06:30

Hi all,
Another overnight report, a good result, see attachment.
John.

Digger

06-10-2005, 07:42

Hi,

I am still confused :confused: about what 's happening around 5 UTC. Change of transmitter? Antenna direction? Antenna, different? ERP?

73

Terje

mitajohn

07-10-2005, 06:13

Hi all,
Another overnight report, a rather good result compared to the 5 of October"s one, see attachment.
John.

FritzWue

10-10-2005, 07:48

Overnight log:

Digger

10-10-2005, 07:57

Hi,

A short log from this morning. The dip at 06 UT was an interruption in the transmission.

Terje

mitajohn

11-10-2005, 06:13

Hi all,
Another overnight report. Low SNR (as always) but a rather very good result, see attachment.
John.

Digger

11-10-2005, 08:41

Hi,

Another overnight log....

Terje

Digger

11-10-2005, 22:23

Hi,
Hey! What happened to the radio weather? Absolutely no audio here from 3.995 MHz at 2120 UTC...:confused:

Terje

mitajohn

12-10-2005, 05:46

Hi all,
Another overnight report. Low SNR (as always) but an even better result than before, 98.7% audio, see attachment.
John.

Digger

12-10-2005, 08:16

Hi,

Another overnight report from Wertachtal. Yesterday evening the conditions were bad and there was no audio until a quarter to three UTC in the morning. I was definitely in the skip zone. MUF last night for 200 km was about 3 MHz which might explain the bad result.

Terje

mitajohn

13-10-2005, 07:45

Hi all,
This is not a good overnight result, there were far better ones.
John

Digger

13-10-2005, 07:52

Hi all,

I was surprised that the reception was so bad in the evening here. MUF was quite low for the 200 km distance last night. My log is also a long one, see for yourselves.

Terje

mitajohn

14-10-2005, 06:40

Hi all,
Another overnight report on 3995. A bit higher SNR and a very good result, see attachment.
John.

mitajohn

15-10-2005, 08:27

Hi all,
Another overnight report on 3995. I started later this log tonight but I left it running until signal lost. I don't know what caused the sharp drops. It is a very good result for my area, see attachment.
John.

simone

15-10-2005, 22:12

Hi all,
quite good most of the time, using the DWT/ loop antenna indoors
Simone

carknue

15-10-2005, 23:26

Nothing after 20:37.

FritzWue

16-10-2005, 07:12

Early morning results, don't know what caused the big dropout around five:

mitajohn

16-10-2005, 08:04

Hi all,

An overnight partialy unattended report on 3995, a very good result for my area, see attachment.

John.

carknue

16-10-2005, 21:50

Again nothing after 20:36 UTC.

mitajohn

17-10-2005, 07:06

Hi all,

An overnight unattended report, there were better ones, see attachment.

John.

FritzWue

17-10-2005, 19:51

Just a short one, good reception tonight with TX switching at six:

carknue

17-10-2005, 22:24

Strange and bad.

mitajohn

18-10-2005, 12:42

Hi all,

Here is an overnight partialy unattended report on 3995, an almost excellent result ever recorded in my area, see attachment.

John.

carknue

18-10-2005, 19:59

An half automated log from last night.

Digger

19-10-2005, 08:20

Hi,

Almost 12 hours of logging enclosed. Around 2115 UTC the signal had gone from S9 to S3 which caused the very low SNR. At 0445 UTC the graph looks the same, with low SNR. However, just before 06 UT the S-meter read a strong S8.

Terje

mitajohn

19-10-2005, 12:05

Hi all,

Here is an overnight partialy unattended report on 3995, an almost excellent result, see attachment. After 06H00 the signal was lost.

John.

carknue

19-10-2005, 23:20

Always strange this frequency. Tonight nearly perfect with DWT indoor.

Digger

20-10-2005, 07:08

Originally posted by carknue
Always strange this frequency. Tonight nearly perfect with DWT indoor.

Hi Carsten,

Don't you think that we both are a little bit too near and not far enough away from Wertachtal? I think we seem to be in the skip zone at times, that is why we experience such varied results?

73

Terje

carknue

20-10-2005, 19:15

But what is the target area of this transmission? The reports from Greece or England do not look much better. And it is the only nighttime frequency from DW. And 200kw for just 11 kbps, where AM sounds better is a total waste of energy. 49m from Sines are working perfect each night, but transmission time is only one hour.

Nevertheless here comes part two of this transmission.

mitajohn

21-10-2005, 07:29

Hi all,

I have reported better results than this one. See the log.

John.

FritzWue

21-10-2005, 13:57

Driving from 48712 Gescher to 48341 Altenberge.
Almost perfect, audio quality could be better.

Digger

21-10-2005, 14:04

Hi,
Yep, that is >>200 km!

Terje

carknue

21-10-2005, 19:22

Surprisingly good results this night.

Sixten

22-10-2005, 08:17

Hi.
Her is my first log from 3995 .
From my broad bands loop 2x5 m under altan roof . S-meter peak S9 very good signal.

mitajohn

22-10-2005, 08:34

Hi all,

Part1

An overnight partialy unattended report on 3995, a very good result for my area, see attachment.

John.

FritzWue

22-10-2005, 08:35

Early this morning I could not decode anything although the signal was strong. The impulse response was totally messed up.

mitajohn

22-10-2005, 08:35

Part2

Andreas

22-10-2005, 08:53

Hi!

While giving reliable and good results from start in the afternoon until the late evening during the night the signal seems to come into serious trouble here.

Sometimes impulse response becomes a complete mess.....

:confused:

73s Andreas

carknue

22-10-2005, 12:25

Similar results here. Only 5% decoding between 3:19 and 5:35 UTC. I don't think that is a zone of death or skip zone problem, because the signal is always very strong. In fact the Impulse response seems to have an infinite ending in these periods. And then the DRM system fails completly. Maybe the signal travels around the grey line in these periods.

Digger

22-10-2005, 12:47

Hi,

Could it be that the F layers are much different during the early morning hours? Compare the two Ionograms I "borrowed" from Juliusruh.

Terje

Digger

22-10-2005, 12:48

Here is my log from this morning until sign off at 10 UTC:

mitajohn

22-10-2005, 14:20

Hi all and @ Carsten,

I am logging to 3995 since last May 2005.
My evaluations until today on the reception of this frequency, in brief are:

June 2005:
Not good reception but there were some short periods of good reception, signal lost at around 03H00.

July 2005:
Better reception, longer periods of good reception, signal lost at around 04H00.

August 2005:
Even better reception very long periods of good reception, signal lost at around 05H00.

September 2005:
Overnight good reception, signal lost at around 05H00.

October 2005:
Overnight very good reception, signal lost at around 06H00.

All these receptions characterized by a low SNR even the signal is strong. Sometimes (more during June - August) even the signal appears strong there were no decoding, I thought that's maybe due to manmade noise. Everyone would excpect better reception with 200kWs on air. By the way, is this the power output of the TX at the antenna input or the onair power?

John

dk8cb

22-10-2005, 15:19

Originally posted by mitajohn
... even the signal appears strong there were no decoding, I thought that's maybe due to manmade noise.

I guess not. Have a look at the impulse response. It may be different at your location, but over here at night, reception on this frequency is severely affected by a too long impulse response of the ionospheric paths causing a stretching of data symbols such that they extend over more than one time frame plus the guard interval following such a frame and distorting each other.

Roland

dk8cb

22-10-2005, 23:44

Quite good, however the impulse response became quite long towards the end of my logging period.

Roland

mitajohn

23-10-2005, 08:43

Hi all,

Part 1

An overnight partialy unattended report on 3995 with added impulse response and interference graphs, see attachment. I recorded it in two parts for better resolution.

John.

mitajohn

23-10-2005, 08:44

Part 2

mitajohn

23-10-2005, 17:41

Hi all,

I found that the graphs in two above reports are not enough readable, so I included them in the attached zip file. Sorry for that.

John

mitajohn

23-10-2005, 21:35

Hi all,

A 4hour report, an almost excellent result until this hour. Look at the comparison with the 22nd's result. I will post in the morning the rest of it since I will continue logging.

John.

mitajohn

24-10-2005, 07:13

Hi all,

This the whole overnight result on 3995, an excellent to near perfect result for my area (except the interference period).
At 06H00 transmission suddendly stopped and started again at about 10 dBs lower signal level, no decoding then, so I stopped logging. See the attachment.

John.

Digger

24-10-2005, 07:32

Hi,

Perfect last night and this morning.

Terje

mitajohn

24-10-2005, 08:51

Hi all,

Hmm, do you see Terje the sharp dropout at 06H00?. They, might be, lowered the power output or changed antenna, so the signal dropped by 10 dBs to my direction.

John

Digger

24-10-2005, 11:11

Originally posted by mitajohn
dropout at 06H00?. They, might be, lowered the power output or changed antenna, so the signal dropped by 10 dBs.

Hi John,

I have observed this a couple of times and noticed that they shut down and come back after a minute or two. If it isn't my imagination, I also notice a drop in signal strength. According to information on DW's Home Page, the antenna is omnidirectional. (?) The direction is given as "0".

I will check this event in detail tomorrow morning - if I remember ;)

:mad: Ooops! Forgot all about it this morning... well...

Any observations in Germany to confirm or clues to this?

73

Terje

mitajohn

25-10-2005, 07:25

Hi all,

This an overnight result on 3995, a very good to excellent result for my area (except the two interference periods).

At 06H00 transmission stopped and started in a minute from DW Julich at 16.6 kbps (How I didn't notice that?). Signal is lower here by 10 dBs.

@Terje now the situation is clear.
I will post later the new log. See the attachment.

John.

mitajohn

25-10-2005, 07:52

Hi all,

Here's the new log after 06H00. Very bad as excpected.

John.

simone

25-10-2005, 16:19

Hi all,
another overnight report, two periods when decoding was not possible at all, see attachment
Simone

Digger

26-10-2005, 07:33

Hi,

Here is an overnight log, which turned out pretty good except for 0500 - 0530 UTC, which could be because of the skip zone or weak propagation. Not quite sure about this.

I tried to record the input level of the carrier, which is a bit tricky with slight Fading present, but my test verifies John's reports of the drop in signal before 06 UTC and after 06 UTC. After 06 UTC there was a drop of about 10 dB in the signal level:

I observed the S-meter from 0550 - 0610 UTC.
Result before 06 UTC: +54 dBµV ... +64 dBµV.
Result after 06 UTC: +42 dBµV ... +56 dBµV.

mitajohn

26-10-2005, 07:33

Hi all,

This is an overnight result on 3995, a very good to excellent result for my area, except the two big dropouts, which I don't know the reason, because most of the time the log was unattended..

At 05H59 transmission stopped and started in a minute without logo change or bitrate. See the attachment.

John.

simone

26-10-2005, 16:56

Hi all,
good results at night, a weak signal in the morning 0505- 0530, see attachment
Simone

Digger

27-10-2005, 07:23

Hi,

A 20 minutes log around 06 UTC. This morning there was almost no difference in the signal strength here. The transmitter went off the air at 0558 UTC and came on air 20 seconds later. The DRM started after another 15 seconds. Looks like they are changing transmitters?

Terje

FritzWue

27-10-2005, 07:54

I hope we soon get more DRM transmissions.
At seven in the morning DW 3995kHz and DLR 177kHz are the only useful signals here.
Furthermore there was a 15 minutes period when the pulse response totally went down with the signal staying at the same fieldstrength, see diagram.
The switching at six is also in my log, SNR was a little lower after that.

mitajohn

27-10-2005, 08:26

Hi all,

This is another overnight result on 3995, a good to very good result for my area. Most of the log was unattended.

At 05H59 transmission stopped and started again in 39 secs without logo change or bitrate but with lower signal and SNR.
I isolated a log fragment of 120 mins to see the switching effect in higher resolution, I also included, in the attachment, spectrum snapshots before and after 06H00. What the purpose of this switching, save of energy? See the zip file.

John.

stegewicht

28-10-2005, 07:57

There´s a reception-report for 3995 kHz.

simone

29-10-2005, 10:04

Hi all,
perfect results for 3 hours early this morning
Simone

carknue

29-10-2005, 11:18

Very stable reception at daytime.

carknue

30-10-2005, 09:46

Log from last night using DWT indoor.

simone

31-10-2005, 07:59

Hi all,
quite good during the night, a very weak signal in the early morning, Tx break at 0630, see attachment
Simone

mitajohn

01-11-2005, 06:38

Hi all,

This is an overnight result on 3995, not a very good one.
At 06H29 TX stopped and started again but signal was already turn too weak so I stopped the log.

John.

mitajohn

02-11-2005, 07:27

Hi all,

This is a typical overnight result on 3995, a very good one.

John.

DRM-Fan

02-11-2005, 21:51

What's up with this transmission, 2 1.5s drop outs evrery 10 seconds as I type this ? I don't usually listen but I was testing an old thinkpad laptop and I thought it was the laptop unrtil I went back to my 3.06ghz HTPC

radiomann

02-11-2005, 21:59

Originally posted by DRM-Fan
What's up with this transmission, 2 1.5s drop outs evrery 10 seconds as I type this ? I don't usually listen but I was testing an old thinkpad laptop and I thought it was the laptop unrtil I went back to my 3.06ghz HTPC

Been ok for me.

Paul

mitajohn

03-11-2005, 06:53

Hi all,

Here is a typical but almost excellent overnight result on 3995.
Can anybody explain why I get better results with Dream than with DRMSoft, for this particular frequency?. Look at the log file.

John

mitajohn

04-11-2005, 07:21

Hi all,

Here is another typical but very good overnight result on 3995.
At 20H00 - 21H00 there was a TX change to a higher bitrate, 14 or 17 kbps and failed from good decoding. See the log

John

Andreas

04-11-2005, 17:40

Very good here last night. I specially appreciated the "non-telephone period"

but the audio feed sounded like AFN in the 70s........

mitajohn

05-11-2005, 09:13

Hi all,

Here is another typical overnight result on 3995.
See the unattended log.

John

mitajohn

06-11-2005, 09:10

Hi all,

Another near excellent unattended overnight result, although with a bit late start.

John.

NT2W

08-11-2005, 03:24

Outstanding signal here at 0300UTC- S9+10dB, and nearly 100% audio... this is what North America could use---- albeit with stereo sound and the data stream---- to sell DRM.

Rich

mitajohn

08-11-2005, 06:52

Hi all,

Another near excellent unattended overnight result with the morning receiving problems.

John.

hsseppo

08-11-2005, 20:21

Hi,

Here is a 34 minutes report of 14.56 kbps Bitrate. Only 82% decoded audio. Impulse responce several milliseconds wide, average SNR 18 dB.

Seppo

hsseppo

08-11-2005, 20:34

Hi,

Here is my report of 11.64 kbps Bitrate 16-QAM MSC Mode. Now 99.6 % decoded. Impulse responce still several milliseconds wide and average SNR 18.4dB. The audio was reasonable good, much better than AM-quality. I was not able to listen the 14.56 kbps transmission earlier, but this 11.64 kbps was perfect.

Seppo

simone

08-11-2005, 20:36

Hi all,
some periods last night with no audio decoding, in the early morning caused by a very weak signal.
Simone

mitajohn

09-11-2005, 06:40

Hi all,

Another very good to near excellent partialy unattended overnight result. The signal was quite strong but dropouts occured due to very long impulse response and again the morning receiving problems.

John.

simone

09-11-2005, 16:40

Hi all,
not too bad during the night, as usual a weak signal in the early morning, see attachment
Simone

Digger

12-11-2005, 08:12

Hi,

Yesterday I let the Kchibo show what it could. On a low frequency, that is. The dropout at 2342 UTC was caused by connecting the external power supply. The radio switched itself off when I inserted the plug :mad: .

There is a large dropout roughly between 04 UTC until 06 UTC. I think this is caused by the very weak ionization before sunrise. The MUF around 05 UTC was zero for all bands. No mirrors, no reflections.

Terje

midre

12-11-2005, 14:11

Hi Terje,

nice performance for this kind of a > DRM Receiver <. Easy to use, very cheap.
OK, this is not a good quality sw receiver, but if I had a look at the price,
- its a perfect tool for DRM beginners.

For a comparison, here is my last night logfile on 3995. Taken by modified Sony, indoor, near Frankfurt.

regards, Michael

Digger

12-11-2005, 19:18

Hi,

Yes, I'll let it play from now on with the internal batteries. Let's see when the log vanishes - hi. (Have not measured the current consumption).

73

Terje

PS: Who said it was cheap!? The Fedex bill has not arrived yet :D

hsseppo

12-11-2005, 20:15

Hi all,

I used today 50cm diameter shielded coaxial loop indoor antenna. It is working rather well, better than 5 meter outdoor wire!

73, Seppo

mitajohn

13-11-2005, 18:17

Hi all,

Another very good partialy unattended overnight result.

John.

mitajohn

14-11-2005, 06:59

Hi all,

Another near excellent partialy unattended overnight result, again the morning receiving problems but in a less degree.

John.

mitajohn

15-11-2005, 07:10

Hi all,

Another near excellent overnight result, the morning receiving problems are more pronounced today.

John.

FritzWue

15-11-2005, 18:34

Driving from 48147 Muenster to 48712 Gescher:

mitajohn

17-11-2005, 06:37

Hi all,

Another typical overnight result. During the last 90 mins the receiving problems were more pronounced due to a heavy thunderstorm.

John.

simone

19-11-2005, 12:42

Hi all,
no problems early this morning (unlike most days), a higher bitrate from 0400 UTC would have been possible, see attachment
Simone

mitajohn

20-11-2005, 08:16

Hi all,

Another typical result. The morning problems were less pronounced.

John.

NT2W

20-11-2005, 14:52

I've seen lots of unattended overnight logs for 3995 from Europe, so thought I'd do one from NAm- pretty much 100% decoding until the band changed around European sunrise time.

Very high SNR with a max of over 25dB here.

A newbie DRMCalc question--- the max frame number changed from 750 to 1500 around 0500 UTC (confirmed from mitajohn's post). Is that a change at the xmitter, or is that a DRMCalc issue?

73
Rich

dk8cb

20-11-2005, 15:33

Originally posted by NT2W
A newbie DRMCalc question--- the max frame number changed from 750 to 1500 around 0500 UTC (confirmed from mitajohn's post). Is that a change at the xmitter, or is that a DRMCalc issue?

It is a result of a mode change at the transmitter. There is only half the number of audio frames on the 16-QAM "overnight mode". Audio quality is correspondingly bad, so bad that a lot of people find it just awful and not worth it. But unfortunately, using this frequency and the antenna's mostly vertical radiation angle (which is intended to generate a larger signal strength at receivers in Europe) results in a lot of ionospheric reflections causing a very long impulse response. Under such conditions, the better higher bitrate modes will fail completely, at least for european coverage. They might produce a better audio quality at your end but that is not the original intention.

How does Dream's impulse response look like at your location during the overnight period? Might be interesting to know.

BTW, if you want to see pictures from the Wertachtal TX site, then go here (http://www.db-serv.net/gallery/album05).

Roland from Munich
(60 kms away from the Wertachtal TX site)

NT2W

21-11-2005, 22:00

Originally posted by dk8cb

How does Dream's impulse response look like at your location during the overnight period? Might be interesting to know.

BTW, if you want to see pictures from the Wertachtal TX site, then go here (http://www.db-serv.net/gallery/album05).

Roland from Munich
(60 kms away from the Wertachtal TX site)

I could supply you with that information, if I only knew how to capture it to a .png or .jpg file! I don't think Windows comes with a utility to capture a window---- any suggestions? Also, what exactly are you looking for so I would get you the most useful information?

Thanks for the pics of Wertachatal---- it looks like I was within 20km of the site in 2001 while on holidays! I stayed two nights in Augsburg, and traveled from the Bodensee to Augsburg so I drove very close! (also spent two very nice nights in München)

73
Rich

dk8cb

21-11-2005, 22:29

Originally posted by NT2W
... if I only knew how to capture it to a .png or .jpg file! I don't think Windows comes with a utility to capture a window---- any suggestions?

Windows comes with such a built-in function. If you want to capture the currently active window then press Alt-Print (Print is located on the upper right of your keyboard, in the vicinity of the Pause and Scroll Lock buttons). If you want to capture the entire screen, press Print or Shift-Print.
Both functions will copy the the respective content to the clipboard. If you don't have any praphics programme, use Microsoft's Paint (already installed on every Windows), open an empty file and insert the content of the clipboard by pressing Ctrl-V and store it in your favourite format.

I always find it strange to see how few people know about these built-in capture functions.

Also, what exactly are you looking for so I would get you the most useful information?

Just a typical screenshot from Dream's impulse response. Access it this way: Channel -> impulse response. Did you never have a look at it?

Roland

NT2W

21-11-2005, 22:50

Originally posted by dk8cb

Windows comes with such a built-in function.

<snip>

I always find it strange to see how few people know about these built-in capture functions.

Just a typical screenshot from Dream's impulse response. Access it this way: Channel -> impulse response. Did you never have a look at it?

Roland

At my place of employment we use a separate utility to do window or screen prints, so I made the assumption it wasn't built in. Thanks for the guidance

I've looked at the various charts in Dream but since I'm new to the technology, I really don't know what I'm looking at :)

The ones I really use the most are the Input PSD screen and the SNR History/Audio chart.

I will grab a couple typical shots and share them if I get a chance tonight.

73
Rich

dk8cb

21-11-2005, 23:30

Originally posted by NT2W
... but since I'm new to the technology, I really don't know what I'm looking at :)

Someone once asked for some information about Dream's windows and I tried to give an explanation on impulse response on this forum. Unfortunately, the post has been deleted (without prior warning) in the meantime but luckily, Google's cache still keeps it. So, if you want to read about the impulse response go to google and look for
dk8cb impulse response cable
then click on the link entitled "cached".
I tried to copy the direct link here but it didn't work for some reason.

Roland

NT2W

22-11-2005, 02:00

Originally posted by dk8cb

if you want to read about the impulse response go to google and look for
dk8cb impulse response cable
then click on the link entitled "cached".
I tried to copy the direct link here but it didn't work for some reason.

Roland

I tried and got several hits, but the forum told me:

Invalid thread specified. If you followed a valid link, please notify the webmaster

:confused:

NT2W

22-11-2005, 03:06

Here is a plot of the Impulse Response at 0229UTC.

Audio decoding is approaching 100% at this point... at 0200 reception was not as good.

NT2W

22-11-2005, 03:07

Originally posted by NT2W
Here is a plot of the Impulse Response at 0229UTC.

Audio decoding is approaching 100% at this point... at 0200 reception was not as good.

Try this again with the attachment...

NT2W

22-11-2005, 03:08

And here is the IR at 0300- SNR decreased a bit, and still some dropouts on audio.

dk8cb

22-11-2005, 10:09

Originally posted by NT2W
I tried and got several hits, but the forum told me:

Invalid thread specified. If you followed a valid link, please notify the webmaster

:confused:

Of course! The post has been deleted on the forum so you have to click on the link that will lead you to Google's cached version, see attachment.

Roland

dk8cb

22-11-2005, 10:36

Originally posted by NT2W
Here is a plot of the Impulse Response at 0229UTC.

Since almost nothing is visible on your impulse response plots, the audio level into your PC seems to be very, very low, actually too low to assure some reserve in case of fading.
Compare to my attached impulse response taken from Kvitsoy, 9470 kHz, which is currently running here. My input level is 40 dB higher than yours. I usually adjust it such that the flat roof of the DRM input spectrum is just below -60 dB on the input spectrum plot.

Roland

dk8cb

22-11-2005, 21:26

Originally posted by dk8cb
... so you have to click on the link that will lead you to Google's cached version, see attachment.

Unfortunately, Google's cache seems to have a problem today, not just with this cached page but with all others as well.
However, in order not to lose it again, I still have the respective page on my harddisk. I have now zipped it and I'll attach it to this post.
Unzip the file to an empty directory (in order to be able to easily delete all the files together after reading) and click on search.html, your browser should open it and display the entire content.

Roland

NT2W

22-11-2005, 21:47

Originally posted by dk8cb

Since almost nothing is visible on your impulse response plots, the audio level into your PC seems to be very, very low, actually too low to assure some reserve in case of fading.
Compare to my attached impulse response taken from Kvitsoy, 9470 kHz, which is currently running here. My input level is 40 dB higher than yours. I usually adjust it such that the flat roof of the DRM input spectrum is just below -60 dB on the input spectrum plot.

Roland

As a result, I looked into adjusting my input level, which was accomplished using my sound card's "mic boost" function. My level has come up quite a bit, although as you might expect no major improvement to SNR. The resulting increase in impulse response will make for a more interesting plot... I'll try and get you one for 3995 tonight.

73
Rich

NT2W

22-11-2005, 21:49

Originally posted by dk8cb

Unfortunately, Google's cache seems to have a problem today, not just with this cached page but with all others as well.
Roland

Google cache was working fine at 2130UT this afternoon, and I was able to read your post---- thanks very much!

NT2W

23-11-2005, 02:22

Originally posted by NT2W

As a result, I looked into adjusting my input level, which was accomplished using my sound card's "mic boost" function. My level has come up quite a bit, although as you might expect no major improvement to SNR. The resulting increase in impulse response will make for a more interesting plot... I'll try and get you one for 3995 tonight.

73
Rich

Here's the IR plot for 0217 this evening.

dk8cb

23-11-2005, 10:13

Hi Rich,

now it seems, your audio level is much too high! Have a look at Dream's input level meter in the main window, it shouldn't extend into the red region. It certainly did at such a high level. Try to adjust your input level slider (in Window's recording mixer, not in the playback mixer) in a way that the flat top level in the input spectrum window is between -80 and -60 dB, corresponding to approximately -33 to -13 dB shown on the level meter in Dream's main window.

It is a good idea to put a link to Window's recording mixer on your desktop, the associated command is:
C:\WINDOWS\system32\sndvol32.exe /r

I can't get rid of the idea that you may have not adjusted the level at all.

Roland

radiomann

23-11-2005, 21:21

Unmanned 3 hour log.

Paul

NT2W

23-11-2005, 21:56

Originally posted by dk8cb
Hi Rich,

now it seems, your audio level is much too high! Have a look at Dream's input level meter in the main window, it shouldn't extend into the red region. It certainly did at such a high level. Try to adjust your input level slider (in Window's recording mixer, not in the playback mixer) in a way that the flat top level in the input spectrum window is between -80 and -60 dB, corresponding to approximately -33 to -13 dB shown on the level meter in Dream's main window.

It is a good idea to put a link to Window's recording mixer on your desktop, the associated command is:
C:\WINDOWS\system32\sndvol32.exe /r

I can't get rid of the idea that you may have not adjusted the level at all.

Roland

Not to worry--- I did adjust the level, and you're right, it was (only slightly) into the red on this particular transmission... the problem is that most signals I experiment here are much, much weaker and result in lower input levels than the Wertachtal signal (exception being the very good Bonaire relay just kicked in by RNW). I just have to keep adjusting!

;)

mitajohn

24-11-2005, 13:08

Hi all,

A typical result after 20H00.

John.

mitajohn

26-11-2005, 07:41

Hi all,

An excellent result tonight.

John.

carknue

26-11-2005, 10:13

Results from this night. Terrible low sound quality. Big problems in the early morning, at daylight perfect decoding with high SNR, but still far too low sound quality.

We need a stable high qaulity coverage in Europe at night in DRM! Suggestion: Clear Out of band 49m frequency from Sines or perhaps the 6075 khz.

mitajohn

28-11-2005, 06:40

Hi all,

An overnight result mostly unattended. There were some problems between 1730 and 1850, also an interfering carrier have appeared now on the left edge of DRM spectrum affecting the reception.

John.

carknue

28-11-2005, 19:59

Really bad results this night. Even 11kbps are too much for this frequency. DW must find a second frequency for night time coverage.

midre

29-11-2005, 16:31

Hi DRMs,

good results from Wertachtal last night. Nearly 100% decoded audio.
Taken with Yaesu FRG 100 and homemade loop antenna.

regards, Michael

carknue

29-11-2005, 19:17

Much better results this night, only problems around 6 UTC.

carknue

30-11-2005, 19:25

This frequency is really digital. One night 1, next night 0. This night 0.

simone

22-12-2005, 20:09

Hi all,
another overnight report, see attachment
Simone

Digger

22-12-2005, 23:21

Hi,

Conditions are terrible tonight.
I'll keep logging through the night; just now there is practically no signal at my place.

Terje

feinstei

23-12-2005, 01:34

Digger,

Conditions may be terrible where you are, but here in North America (specifically Detroit, Michigan) 3995 is coming in like "gangbusters" at 0130 UTC on 23-Dec-2005. SNR readings using DREAM or the DRM Software Radio is 16 dB -20.5 dB with perfect audio (well, maybe a dropout here or there).

Fred E.
Detroit, MI
TenTec RX-350
Butternut Vertical Ham Antenna

Digger

23-12-2005, 07:19

Hi,

Compared to 23rd - 24th October last night was bad. Interesting to learn that the signal travels all the way to Detroit. I'm a bit too near to the transmitter, but usually it is much better except for the hours just before sunrise. I guess it is the time of the year. Enclosed is my overnight log (compare it to 23rd - 24th October!)

73
Terje

carknue

25-12-2005, 09:26

Quite good results with DWT and Loop in my x-mas QTH. But a lot of local interferences here. Even stronger than in Frankfurt.

carknue

25-12-2005, 23:23

Very good results this evening. Seems to be much better than in Frankfurt, but that is hard to say, because the reception varies quite a lot from night to night. And it is quite a shame for DRM, that this is still the only nighttime transmission. I still have not found a working MW antenna for the DWT.

feinstei

26-12-2005, 04:01

Here in Detroit, Michigan USA it's been coming in very nicely with a few dropouts from 0200 UTC until 0400 UTC (2100 to 2300 local time) on 26-Dec-2005.

Really peeves off the ham radio operators on 80 metres who can't stand the QRN from this DRM station.

Does anyone know why DW is transmitting on this particular frequency which is not a common one for European broadcasters?

Fred E.
N8UC - Detroit

FritzWue

26-12-2005, 08:23

Although not much in use the 75 metre band is a standard broadcast band except in America....lucky hams with a strong representation there.

carknue

27-12-2005, 17:34

Oh, this frequency is not any better than in Frankfurt. Very bad results yesterday. A total waste of energy. One night top, one night flop.

mitajohn

31-12-2005, 09:20

Hi all,

An overnight typical result, mostly unattended.

John.

CT4RK

31-12-2005, 21:01

HI all

In Sines DW station, in our monitor receiver, a DT700 from Fraunhofer institut, for me the best receiver i have been using, this frequency is very stable and for hours, days, weeks... Also (like now) when have a strong (about 65 dBuV) AM station on 3985 KHz, I do not notice any dropout. Almost perfect all the time. It is incrediible, when I tune the 3995 in AM mode I only hear the AM station, but when I change for DRM mode the AM station doesn`t produce any dropout. The SNR is between 23 and 27 dB.
About the bad conditions on Germany for this QRG, I think that you have intersymbol interference, because I believe that you are listening by sky and land wave path. Waiting for SFN on this QRG with Sines, and maybe in the next month all problems finish on this QTG.
Happy new 2006 full of health, peace ...and DRM receivers at low cost!!! of course!!!
CT4RK
Carlos Mourato
Sines

FritzWue

31-12-2005, 21:49

Hi Carlos,

thanks for the wishes, also a successful 2006 to you!

BUT:

Who do you think will be the new listeners to a station
that transmits in telefone quality most of the time?

My guess: NOBODY! ...at least I don't,
not because of the content but because of the low audio quality,
and playing classical music then is a joke.

Regards

Fritz

simone

04-01-2006, 16:53

Hi all,
quite good during the night, problems as usual in the early morning, see attachment
Simone

FritzWue

06-01-2006, 17:01

Driving from 48712 Gescher to near Recklinghausen via A31, A2.
Dropouts under high voltage lines and in a tunnel.

simone

11-01-2006, 17:34

Hi all,
here is an example of the AF service as it is currently broadcast on DW´s transmissions.
Simone

dk8cb

11-01-2006, 17:43

Originally posted by CT4RK
Waiting for SFN on this QRG with Sines, and maybe in the next month all problems finish on this QRG.

I can only think that it will be even worse then if another long-delayed signal adds to the already widely spread impulse response.

Roland