[amsat-bb] Repeater interference on AO-92

Eric Williams kv1j at comcast.net
Wed Apr 29 03:17:23 UTC 2020


I ran the experiments for 2 passes. 28Apr 1608 UTC and 29Apr 0245 UTC.  The
first pass was just a few minutes before it switched to the video mode.  The
second pass was high elevation and 11 minutes.

It was mentioned that the interference might be from a 145.110 MHz repeater
due to the 3rd harmonic.  Also mentioned were towns heard in the
conversation and that there was a courtesy beep.  A repeater in our area
that fits all those items in the N1CON repeater in Concord MA.

For both passes I heard the bird fine and there were ongoing QSOs.  During
the passes I transmitted periodically on the repeater announcing my call and
'testing' to cause some audio on the repeater.  Also had another station
transmitting on the repeater.  Throughout the test I did not hear any
interference on the downlink.  So also, I did not listen to the uplink
frequency since there did not seem to be any interference at that time.  I
am using different radios for TX and RX, and antennas that are far apart for
the tests.

I'll check from time to time listening to the downlink.  If I hear the
interference, I can both check the uplink frequency and also listen to the
local repeaters.  There are many in this area.

73,  Eric  KV1J  FN42 (West of Boston MA) 

-----Original Message-----
From: Eric Williams [mailto:kv1j at comcast.net] 
Sent: Tuesday, April 28, 2020 11:14 AM
To: 'amsat-bb at amsat.org' <amsat-bb at amsat.org>
Subject: RE: Repeater interference on AO-92 

Yes, I am also listening to the uplink freq.  Next pass is in about 1 hour.
73  Eric  KV1J 

(I use digest mode for this list so pardon the not including the string of
messages)

-----Original Message-----
From: Eric Williams [mailto:kv1j at comcast.net] 
Sent: Tuesday, April 28, 2020 10:51 AM
To: 'amsat-bb at amsat.org' <amsat-bb at amsat.org>
Subject: RE: Repeater interference on AO-92 

I am in the area of a suspected repeater. Also in the area of the towns
mentioned to could be that machine.  I'll watch for the next AO-92 pass and
announce my call of the repeater a few times and listen to AO-92.  So if you
hear "KV1J" it is me testing for the interference.  I have not looked at the
pass schedule yet but I can try a couple passes.
73,  Eric  KV1J  FN42



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