Transmissions were held from 06 UTC 21st May to 06 UTC on May 22nd on the frequencies of 9740 kHz (9820 kHz) and from 06 UTC on May 23rd to 06 UT on May 24th at the frequencies 7370 kHz (7430 kHz). Also from 06 UTC on May 28th to 06 UTC on May 29th at different frequencies (9740, 9820, 7370, 7430 kHz).
Two transmitters were used:
1 – Bolshakovo, 15 kW, beam 40 (9.7 MHz, 7.4 MHz);
2 – Krasnodar, 30 kW, beam 347 (9.7 MHz) and a beam 337 (7.4 MHz).
Every hour the first transmitter was on the air for the first 40 minutes and the second transmitter was on the air in the last 40 minutes.
The purpose of the study – the detection of network gain (% of decoded audio from the first TX, from the second transmission and from both the transmissions).
The synchronization point was near Moscow. Switching between the frequencies in the same band was done to minimize interference from other stations.
The test transmissions have received good reception feedback from Greece, Sweden, France, Belarus and Romania. Reception reports can be seen here .
Moscow Technical University of Communications and Informatics performed most of the research works on DRM in Russia, including DRM 26 MHz SFN test, MW tests, NVIS tests etc.
Russian TV and Radio Network (RTRN), a DRM Consortium member, funded most of the research works on DRM in Russia.
Oleg Varlamov
Moscow Technical University of Communications and Informatics, Senior Staff Scientist.
