[amsat-bb] Re: AO-51 power up, PL test tomorrow
glasbrenner at mindspring.com
Sat Apr 10 15:27:46 PDT 2010
PL is on as of about 2215Z. Before LOS I heard it drop twice for a
second or two until it heard a valid tone again. This will happen about
every 120 seconds. Reports are welcome, especially from remote users/areas.
73, Drew KO4MA
Andrew Glasbrenner wrote:
> 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
>> 73, Drew KO4MA
>> AMSAT-NA VP Operations
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