DRMradio

 

 

DRMradio.
DRM modes.
COFDM.
multiplex.
audio.
Journaline.
multimedia.
bandplan.
QSL 1.
QSL 2.
DRM UK.
Beidweiler.
Crystal Palace.
Orfordness.
Ismaning.
Junglinster.
Marnach.
Moosbrunn 1.
Moosbrunn 2.
Rampisham.
S Maria di Galeria.
Taldom.
Sines.
Woofferton.
bit Express.
BR-B5akt.
RTL Radio.
Vatican Radio.
WDR 2 Klassik.
DRMscan 1.
DRMscan 2.
DRM receivers.
DRM Poll.
Links.

If you listen to ‘Voice of Russia’ DRM broadcast from Taldom (near Moscow) then this is a photo of the transmitter antenna used.

 

 

The antenna system represents the in phase horizontal antenna with an aperiodic reflector element. Various elements in the 4 part antenna system can be switched giving a choice of main lobe direction and lobe width. Currently the antenna has an azimuth of 240 degrees.

 

 

One of the short wave transmitters modified for DRM transmissions. This SSB transmitter provided about 100 kW peak output power using a push-pull PA. After modification the output power was increased to 200-220 kW (approx). Good transmit linearity is required for OFDM broadcasts, when testing the transmitter using the 2 tone method nonlinear products were better than -38 to -42 dB for all RF input levels.

 

 

 

The resulting spectra of the digital signal is shown, the red line represents the ‘spectrum mask’ requirement to meet the ITU DRM specification.

 

 

 

The Taldom site also transmits ‘Radio of Russia’ (Radio Rossii) and ‘Yunost’ (Youth) on long wave, aerial mast is 257 meters high.

 

 

 

[thanks to Andrew Shaidurov for the photos and information]

 

 

Taldom transmitter site