[amsat-bb] Re: D-STAR repeater problems in Copenhagen

[Nate Duehr]

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