Moscow DRM SFN tests

[UA3ARI]

Moscow Technical University of Communications and Informatics under contract with the Russian TV & Radio Network (RTRN) will fulfill DRM SFN tests on the HF.
Transmissions will be held from 06 UT 21 May to 06 UT on May 22 at the frequencies of 9740 kHz (9820 kHz) and from 06 UT on May 23 to 06 UT on May 24 at the frequencies 7370 kHz (7430 kHz). Also from 06 UT on May 28 to 06 UT on May 29 at different frequencies (9740, 9820, 7370, 7430 kHz).
Two transmitters will be used:
1 - Bolshakovo, 15 kW, beam 40 (9.7 MHz, 7.4 MHz);
2 - Krasnodar, 30 kW, beam 347 (9.7 MHz) and beam 337 (7.4 MHz).
Every hour the first transmitter will on the air in the first 40 minutes and the second transmitter will on the air in the last 40 minutes.
Thus the first 20 minutes you can listen to the first transmitter, middle 20 minutes - both transmitters in SFN, and the last 20 minutes - the second transmitter.
The purpose of the study - the detection of network gain (% of decoded audio from the first TX, from the second TX and from the both TX).
Synchronization point will be near Moscow. Switching between the frequencies in the same band will be operative to minimize interference from other stations.
Transmission may also be heard in the Nordic and Baltic countries. Please send reception reports.

Oleg

[UA3ARI]

Field strength prediction on 9,7 MHz at 18 UT.

Oleg

[MARCEL]

Hello Mister Oleg,

I will receive this test, I send to you report no problem.

Marcel/Notheast France.

[tradio99]

Oleg, is it possible to make at least one test on Saturday or Sunday?

[UA3ARI]

Hello Marcel,
it will be not easy - France is not in antenna pattern. But may be.

Hello Vladimir,
Unfortunately it is not possible to make at least one test on Saturday or Sunday on two reasons:
- we have minimum local interference at our measurement points (Rural (dacha) locality) in working days;
- transmitting and measuring staff wants to have a day off.

21 May we plan to start at 06 UT on 9740 kHz until (preliminarily) 16 UT, then 9820 kHz until (preliminarily) 21 UT, then 9740 and so on.

23 May we plan to start at 06 UT on 7370 kHz until (preliminarily) 13 UT, then 7430 kHz until (preliminarily) 17 UT, then 7370 and so on.

Frequency switching can be only on the hour in.

Oleg

[F1BJB]

Hello
Interesting test.
The schedule seems nice I have just a question about the content:
If the spoken language changes during the test it could impair the reports.
A musical content would be appropriate like radio Mayak for what I have heard of it.
http://fr.delicast.com/radio/Russie/Radio_Mayak
As a bonus it could retain the attention of listeners not aware of the test.

[UA3ARI]

By laws we must use the radio "Mayak" as the content for the test broadcasts.

Oleg

[F1BJB]

Sometimes laws are good :-)
Laurent

[UA3ARI]

Field strength prediction on 7,4 MHz at 21 UT.

Oleg

[MARCEL]

Bonjour Laurent,

Peut-être que le signal passera sur la France, les prévisions sont une chose, c'est comme la théorie et la pratique, on verra bien.

[UA3ARI]

Marcel,
I calculate field strength for more wide area.
Reception in France may be possible from Bolshakovo's back lobe at some hours.

Oleg

[UA3ARI]

...and Krasnodar's side lobe at some hours.

[F1BJB]

Originally Posted by UA3ARI

Synchronization point will be near Moscow.

Does this means that Synchronization will be dynamically adjusted ?
What are the distances between the 3 points ?
Sorry for my poor geography knowledge
73's

[UA3ARI]

From each TX to RX about 1000 km, and delay between TX is not necessary. Another points with different propagation times (until 6 ms) may be OK.

[F1BJB]

Hi
Signal is here on 9740 Khz right on time peaking 30dB SNR