Special DRM transmissions to TUNIS/ HFCC conference

[simone]

There will be special DRM transmissions to TUNIS during HFCC conference next week (Monday 2 to Thursday 5 February 2009) from Issoudun TDF:

Tx location: Issoudun / France,
Power = 150 kW
Azimuth = 150°
Antenna = 4/4

DRM configuration:
64 QAM; cr=0.6; SBR; mono



*F = 11875 kHz*
Monday 02/02: 08.00 to 10.00 UTC only
Tuesday 03/02: 08.00 to 10.00 UTC only
Wednesday 04/02: 08.00 to 10.00 UTC
Thursday 05/02: 08.00 to 10.00 UTC

*F = 11875 kHz*
All days: 02 to 05/02
12.00-14.00 UTC

*F = 5865 kHz*
All days: 02 to 05/02
19.30-20.59 UTC

DRM listeners in Southern Europe and North Africa should be able to receive these transmissions, please post results here.

Thanks,
Simone

corrections from Jacques post below in red

[F6AJW]

HI Simone, James and other friends,

Sorry, I made a mistake: transmissions on 11875 kHz will be also from 08.00 to 10.00 UTC on Monday 2/02 and Thuesday 3/02.

Regards / 73's

Jacques GRUSON F6AJW

[Sixten]

Hi Jacques.

Short log from 11875 . very fast end deep fading. .:confused:

[Sixten]

Hi all.

Last 58min. now better signal . :)

Ok Jacques.

TNX info, TX is QRV now again. 1207UTC.

[F6AJW]

Hi Sixteen,

Antenna direction is not good for you but nice to know that transmitter is:) on air.

Rezgards / 73's.

Jacques

[Ager]

Well, Jacques, we here in the North presumably like TDF so much that we still try to keep listening (especially if we dont have to listen to TDPRadio trance any more). :)

Good SNR, perfect reception here at the moment. It is just too bad, for me, too, that I cannot be listening somewhere in the warmth of Tunis.

[F6AJW]

Thank you Ager.

I h

[F6AJW]

Thank you Ager.

Sorry for my too short previous message...:o

I had another look to your very interesting reports (with audio files) sent during transmissions to Finland some days ago. Now, you are in a less than optimal situation I agree.

I am no more working for TDF being something like pre-retired (or "early retirrment") but still in close contact with my friends there and keeping on supporting DRM.

[Digger]

Hi Jacques and all,

Good to see you back in the Forum again, Jacques. I am not really in the target area either, and like previous transmissions from ISS towards Africa, it is not optimum for my QTH. However, the 2nd transmission was better than the first.

Btw, the IR was very messy here with up to 12 peaks visible...

I didn't listen too closely, but TDP went silent just before 09 UTC, then about 20 minutes later the music started again. Around 0927 UT suddenly the language changed to French.

[Sixten]

Hi Jacques and all.


Perfect DRM propagtion this time strong and stabile, but only 2min music from this 1h 54min. transmission .:rolleyes:

[mitajohn]

Hi all,

I received this transmission today with a very good signal (40 - 60 dBuV). I was expecting a higher SNR figure...

It started with no audio for a while and at 20.96 kbps BR/P stereo and TPDradio label. Then, music started. The sound was good (~13 kHz BW) as well as the IR. I was monitoring until 08:45 then I left it unattended to the end of both transmissions. Sometime (?) the label changed to TDF-RFI and 18.28 kbps BR/ mono. Find attached the results.

[Ager]

Jacques, I too, hope to read more from you, now onwards!
Yes, I seem to be in a worse position in this test here in the North. I guess I received much less that Sixten. There were several breaks in both transmissions. Anyway, much and long sequencies were quite listenable.

Previous TDF/CRI tests brought just perfect results here.

I guess, am normally a little aside from target areas, but anyway with lots of good daily receiving opportunities. So DRM listening is not going to loose its fascination.

[Digger]

Hi,
5865 became 5875, and BBC on that frequency at 19:45 UT is 40 dB stronger than the DRM signal ... :confused:

[mitajohn]

Hi all,

Impossible to be received due to strong co-channel QRM.

[Sixten]

Hi all.

Good signal stringt from start but bad DRM propagtion and BBC 500Kw strong give influence . 2000UTC BBC QRT now better reciption . Signal stringth up to 74dbuV 2030UTC . Perfect last 40min.

[Digger]

Impossible to be heard due to strong co-channel QRM here too.

[mitajohn]

Hi all,

The co-channel QRM stopped at 20:00 so I managed to receive this transmission and submit the results. The signal was always below 40 dBuV and suffered by the splatters of the TX on 5885 kHz. A nearly perfect result though.

[F6AJW]

Thank you Ager, John, Sixten and Terje for sending reports.

I understand that 5875 kHz 19.30 -20.00 UTC is very bad and better (especialy in Greece) during the second part of the transmission (20.00 - 20.59 UTC).:confused:

I have currently no info from Tunis regarding actual reception on site from Michel Penneroux or others.

Good night.

Jacques

[Sixten]

Hi or GM Jacques.

Good signal stringth but hi delay for wrong antenna lob in my direction give big dropout .

[mitajohn]

Hi all,

Unfortunatelly the remote control didnt work so no morning results. I will report results for the 12:00-14:00 transmission.

[F6AJW]

Thank You John and Sixten.
A few information:
- 11875 kHz will continue today until 1445 UTC,
- 5865 kHz will be used today evening and the other days as 5875 kHz was wrong; somebody hit the wrong key!

Regards.

Jacques

[Sixten]

Hi Jacques.

Thanks for info.

Very good propagtion today to 1350UTC now direct out. :) :) :)

[mitajohn]

Hi Jacques and all.

Thanks for info.
Here are the results for the whole transmission. The signal at start-up was about 30 dBuV, then gradually climbed up to 60 dBuV and stayed there. At 13:30 QRM splatters from the TX on 11870 kHz affected the decoding during fading periods and only when the signal was below 40 dBuV, which caused dropouts. Take a look at the graphs.

[Digger]

The two hours from this morning started out weak, but improved all the time up until the end. I am off-target anyway.

The afternoon session was a complete loss.

Now at 19h40m UT on 5865 kHz my receiver doesn't know how to handle what's coming down, so I'll just call it a day.

[Sixten]

Hi Jacques and all.

This time was DRM propagtion on this band to my QTH very bad. Signal stringth was very good. So i have better reciption on 7315 AM Hi :) .

[mitajohn]

Hi all,

DRM transmission started together with an AM TX on 5860 kHz. After the start-up the signal quickly reached up to 60 dBuV. Around 19:50 the signal dropped to 45 dBuV and affected by the QRM from the 5860 kHz TX as well as from the splatters of the 5875 kHz TX. When the 5875 TX switched off (20:00) the results got much better and even better when 5860 TX switched off (20:30).

[Sixten]

Hi all.

Her is log just now 2h 40min. very strong signal and fine propagtion only slow fading. 34 to 64 dbuV.:) :) :)

[mitajohn]

Hi all,

Here's an unattended morning auto log. Perfect results.

[mitajohn]

Hi all,

Here's an unattended noon auto log. Decoding problems due to QRM from the TX on 11870 kHz.

[Digger]

A little bit less decoding here compared to other places ...

[mitajohn]

Hi all,

The propagation didn't help the reception tonight. The signal was about 30 dB lower than yesterday and the decoding affected badly by the QRM, until 20:30, when it stopped. Check the "pngs".

[Owdjim]

Hi All

These tests have not made it to NZ much at all.

The best I've seen was the attached log from 11875 kHz on the 4th.

73 Chris

[Sixten]

Hi all.

Good signal today only short fast fading. from 54 dbuV to 34dbuV. Log 71min.

[mitajohn]

Hi all,

Here's an unattended morning auto log. Again perfect results.

[mitajohn]

Hi all,

Here's an unattended noon auto log. Perfect results until 13:28 when QRM from the TX on 11870 kHz started.

[Digger]

Well, out of the target area as I am, the log cannot be helped. The first part was quite OK and I could follow most of the content, but the latter part was a dead loss.

[F6AJW]

Hi All!
It is over now, thanks for all reports received.
I got very good feedbacks from Michel Penneroux / HFCC conference in Tunis. It seems that DRM reception was good all day long so very posiitive indeed (good QoS at such a relatively short distance with 150 kW and 4/4 antenna)!

Good reception in Athens for John who was the nearest listener from Tunis. Quite good reception (depending on time in the day) in Sweden (Sixten) and Finland (Ager); not too good in Switzerlaand (Terje) and bad in New-Zealand (Chris). Pity we have nobody on DRMRX forum available in North Africa (or even in South Italy) for sending more technical reports. I do not know if Deutsche Welle DRMMonitoring system in Tunis was operationnal, I forgot to inform DW.
Regards.
Jacques