[amsat-bb] Interference from repeaters

Richard Ferryman g4bbh at btinternet.com
Mon May 23 16:37:26 PDT 2011

I have for some time wondered what was causing a considerable amount or QRM (S9+60dB) to the ISS downlink on 145.800. It took a while to identify as there is no CW ident etc. but I have now discovered this is a new D-Star repeater on our repeater channel RV63  which is 145.7875 MHz, only a couple of kHz from ISS and inside the doppler shift range.  It seems very poor planning to place high this powered high sited repeaters so near to the satellite allocation. Is this becoming a common problem and are repeaters also causing any problems to uplinks?
Dick G4BBH

More information about the AMSAT-BB mailing list