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

Andrew Glasbrenner glasbrenner at mindspring.com
Sat Apr 10 04:11:49 PDT 2010

Well, the PL mode is still off. We'll try again this afternoon.

73, Drew KO4MA

Andrew Glasbrenner wrote:
> 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 
> appreciated.
> 73, Drew KO4MA
> AMSAT-NA VP Operations
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