Voice of Russia on 15780 kHz

[df9rb]

Hi all,

VoR exceeded the 40 dB hurdle! I think VoR has the best aligned transmitter for DRM worldwide!!!!! Dream logged 41.2 dB
Receiver TS850, 3 Element HAM-Yagi 15 m high, Signal about 9+ 20 dB, manual gain control


Bernd

[dk8cb]

Originally posted by df9rb
I think VoR has the best aligned transmitter for DRM worldwide!!!!! Dream logged 41.2 dB ...

But one should not forget that this transmitter is an SSB transmitter with a linear power amplifier, whereas many other transmitters with the exception of the newer pulse-width modulated types, are just linearity-corrected AM transmitters with class-C power amplifiers.

Also, I guess, you would not get such a good result using a non-directional antenna that receives everything of Taldom's signal that is bounced back by the ionosphere.

Roland

[df9rb]

Hi Roland,

I think the reason for this high SNR is the linear transmitter (I did not know that they use a SSB transmitter).
My beam for amteur radio helps only on weak signals on higher frequencies (i. e. DW from Trincomale or RTRN from Novosibirsk)
On frequencies above 12 MHz I see a F/B ratio of about 10 dB on the S-Meter but no impressive influence on the SNR if the signal is strong. Today I tried this again with DW from Sines. The attached screenshots showing the SNR and Delay dont show an influence of the antenna direction or the EWE antenna. From minute 12 to 8 backside of the beam, 8 to 4 beam directed to Sines, 4 to 0 EWE antenna. The delay from the minutes 12 to 8 could be a little higher (back side of the beam) but I am not sure that this would be reproduceable

BErnd, DF9RB

[Per]

Feb 13

Hi,

Max SNR here was 27.6 dB. Overall good result today from VoR; CDA: 93 %. Time: 10:05-11:00 UTC. The last 20 minutes before close down gave the best reception.

[df9rb]

Hi all,

perfect the last 50 minutes.

Bernd, DF9RB

[simone]

Hi all,
good results this morning, more stable signal than most days, see attachment
73, Simone

[df9rb]

Hi all,

100 % audio

Bernd, Df9RB

[Jos]

15780 VoR

Hi all,

Today I got 94% of audio.

Jos

[Jos]

15780 VoR

Hi all,

The reslts of today.OK!

Kind regards.

Jos

[df8uo]

Hi all,

almost perfect today for more than 3 hours (as usual)

73

Daniel

[Andrew]

Hi all,

Since March 27, 2005 a schedule of our daily DRM transmissions of VoR will be as shown below:

- 15780 kHz at 6:00 - 9:00 (in English),
- 15780 kHz at 9:00 - 12:00 (in German)
- 9480 kHz at 13:00 – 14:00 (in Russian)
- 9480 kHz at 14:00 – 15:00 (in English)
- 9480 kHz at 15:00 – 16:00 (in German)
- 9480 kHz at 16:00 – 17:00 (in French)

All times are UTC.

Great thanks for your reports and notes.

Best regards,

Andrew

[simone]

Hi all,
my first results since the A05 schedule, no interferences but some dropouts due to deep fading, see attachment
73, Simone

[4S7DRG]

VOR on 15780 khz

Colombo
05-04-02

Hi all DRM´s,

Today a weak signal from Taldom at this end.
see attached log.

[df8uo]

Hi all,

find attached my log from today. Strong signal with some fading.

73

Daniel

[df9rb]

Hi all,

very high SNR today. Max SNR above 40 dB.

Bernd, DF9RB