As I recall IARU Region 1 (Europe&Africa) approved the use of 145.7875 MHz for repeaters over a decade ago.
You're right it's unworkable with the ISS operating on 145.800 MHz +/- 3kHz doppler shift and with 5kHz deviation. Unfortunately that was what IARU Region 1 decided despite having agreed earlier to 145.800MHz being used for ISS. That decision means there are a large numnber of FM and D-STAR repeaters using 145.7875MHz. Anyone near to a 145.7875 MHz repeater will suffer considerable interference when listening to the ISS downlink. 73 Trevor M5AKA --- On Tue, 24/5/11, Richard Ferryman <[email protected]> wrote: > 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 > _______________________________________________ > Sent via [email protected]. > Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur > satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
