[amsat-bb] Re: HO-68 145.825 uplink
kb2m at comcast.net
Sun Dec 27 10:30:36 PST 2009
Also, the interfering packet(I'm assuming you're talking about packet's
attempting to get digi'd by ISS and PCSAT) won't get acknowledged(or
processed as a packet) by HO-68 as the digi(BBS) callsign is incorrect. So,
these would only effect someone in the immediate area of the offending
unattended station, On the uplink only. On the other hand, I myself would of
chose a different uplink frequency.
I also agree it still looks like an overuse, and PL issue. When the newness
wears off, HO-68 in FM mode will work just fine, except on FD :)
73 Jeff kb2m
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Andrew Glasbrenner
Sent: Sunday, December 27, 2009 12:59 PM
Cc: amsat-bb at amsat.org
Subject: [amsat-bb] HO-68 145.825 uplink
Yesterday afternoon, Mark, N8MH and myself ran a little experiment on
AO-51. We linked the SQRX receiver, listening on 145.825, to the 435.150
transmitter for several minutes over the eastern US. I wanted to see how
congested the 145.825 uplink was with unattended packet beacons. We
heard about a dozen packets, about two per minute. Most of them were not
The implication here is that HO-68 may be impacted by these unattended
beacons while in FM/Packet mode, but not very much. Most users would
have much stronger signals, and the interference is typically very short
in duration. PL issues, and interference between the Voice and Packet
system over densely populated areas is a separate issue.
73, Drew KO4MA
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