D-STAR repeater problems in Copenhagen
Hi all, During December and during the last large activity on the ISS, some of us here in Copenhagen have had problems with a D-STAR repeater on 145.7875 MHz. Do any of you have a measurement of the spectrum of the D-STAR transmissions ?
The theoretic spectrum should be more than 60 dB down on 145.800 MHz,but that does not seem to be the case. Including doppler the downlink from ISS is 145.796 MHz, when it is going away from us to the East, which is the direction of the repeater :-(
Personally I am just 6 km away from the repeater with no obstructions on the pass from it.
To avoid flames - no I have nothing against D-STAR :-)
73 OZ1MY Ib
OZ1MY wrote:
Hi all, During December and during the last large activity on the ISS, some of us here in Copenhagen have had problems with a D-STAR repeater on 145.7875 MHz. Do any of you have a measurement of the spectrum of the D-STAR transmissions ?
The theoretic spectrum should be more than 60 dB down on 145.800 MHz,but that does not seem to be the case. Including doppler the downlink from ISS is 145.796 MHz, when it is going away from us to the East, which is the direction of the repeater :-(
Personally I am just 6 km away from the repeater with no obstructions on the pass from it.
To avoid flames - no I have nothing against D-STAR :-)
73 OZ1MY Ib
The Utah VHF group seems to have done the most (published) scientific research.
http://utahvhfs.org/ http://utahvhfs.org/dstar.html http://utahvhfs.org/freqfaq1.shtml#dstar_narrow http://utahvhfs.org/dstar_channel_spacing.html
Nate WY0X
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Nate Duehr -
OZ1MY