[amsat-bb] AO-51 mode change and recommendation

Andrew Glasbrenner glasbrenner at mindspring.com
Mon Dec 28 16:13:24 PST 2009

AO-51 has been switched to the SSB/FM crossmode repeater, 145.880 USB 
up, 435.150 FM down. Power output is 1.93 watts. The downlink modulation 
is set very high, so that even very weak signals will be audible. The 
downside to this is that someone running excessive power will cause the 
downlink to distort.If this happens I'll be forced to adjust the 
modulation level down, or possibly end the mode early. For a "normal" 
station, 5 watts on the uplink to a modest gain antenna is entirely 
sufficient. Please use the minimum power necessary. This mode -requires- 
tuning the SSB uplink precisely for Doppler, and to effectively do that 
you will need full duplex.

Please use this for voice communications only, until Straight Key Night, 
when CW will be the designated mode.

Thanks, and enjoy this unusual mode.

73, Drew KO4MA
AMSAT-NA VP Operations

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