[amsat-bb] HO-68 145.825 uplink

Andrew Glasbrenner glasbrenner at mindspring.com
Sun Dec 27 09:59:17 PST 2009

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 
very strong.

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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