[amsat-bb] AO-51 power up, PL test tomorrow

Andrew Glasbrenner glasbrenner at mindspring.com
Fri Apr 9 16:20:50 PDT 2010

This evening I shut the 435.150 transmitter off and raised 435.300 to 
near 2 watts output. Tomorrow morning I plan to turn on the new PL 
routine. This improved routine will turn the downlink on with an 
unsquelched uplink when it hears a 67 hz tone. I plan on leaving a tail 
of several minutes, so the transmitter will stay on without hearing a 
tone for an interval of several minutes.

What does this mean for the user? It would be helpful to program in a 67 
hz PL tone again, but not absolutely required as long as someone else in 
the footprint does. It also means if you are the first person in the 
footprint (not very likely in North America, Europe, or Japan) you might 
not hear the satellite until after it hears 67hz for a few seconds.

If all goes well, we'll continue this mode through the mode change 
Sunday night. Reports from when the downlink turns on or off would be 

73, Drew KO4MA
AMSAT-NA VP Operations

More information about the AMSAT-BB mailing list