[amsat-bb] Re: Interference from repeaters
g.shirville at btinternet.com
Tue May 24 05:34:54 PDT 2011
Uum not quite - The Austrian conference paper refers only to repeaters that
have been established INSIDE the segment of the band allocated to satellite
operation ie above 145.800MHz.
The RV63 145.7875MHz operation has come as a result of the adoption of
12.5kHz channel spacing for 2 metre repeaters back in the mid 90's. Before
that time the highest repeater output frequency was 145.775MHz - albeit
with a higher deviation than now of course.
Here in the UK we have seven FM units and one DSTAR unit on RV63
Sent: Tuesday, May 24, 2011 1:03 AM
To: Richard Ferryman ; Amsat - BBs
Subject: [amsat-bb] Re: Interference from repeaters
Hi Dick G4BBH
Same problem in Italy ! This will be discussed during the next IARU Region-1
Conference in Sout Africa upon request from Austria.
----- Original Message -----
From: "Richard Ferryman" <g4bbh at btinternet.com>
To: <amsat-bb at amsat.org>
Sent: Tuesday, May 24, 2011 1:37 AM
Subject: [amsat-bb] Interference from repeaters
> 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 AMSAT-BB at amsat.org. 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 AMSAT-BB at amsat.org. 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
More information about the AMSAT-BB