[amsat-bb] Re: Russian speaking QRM on AO-51 Rev: 13642

Jim Sanford wb4gcs at amsat.org
Sat Feb 3 11:00:44 PST 2007

Good stuff, thanks!

As to your last statement, I certainly have no better ideas.

Press on, and thanks!

Andrew Glasbrenner wrote:

>> Yeah, but PL on stops non-hams from expending battery power.
>> 73,
>> Jim
>> wb4gcs at amsat.org
> Correct, but not quite that simple. The PTT part of PL hasn't been in 
> use much for a host of reasons that I will not go into now. We could 
> go back to it now, but I've asked the command stations to hold off 
> until a few more pieces of software are ready, partially to retain 
> continuity. Jim White is working on a program to fulfill an idea of 
> mine that will allow a uplink with PL to turn on the downlink 
> transmitter, then immediately switch to the no PL audio path. The 
> repeater and downlink will then be on for n number of minutes with no 
> PL required. After n minutes the downlink times out and another PL'ed 
> uplink will start the loop over again.
> This will allow us to do several important things simultaneously. We 
> will be able to save battery power when the satellite is not over 
> users, but at the same time we will not have the same degree of logjam 
> problems because the PL will only be required once or twice per pass. 
> Also as long as one person is PL capable, everyone in the footprint 
> can play whether or not they have a PL capable radio. We'll also be 
> able to hear the QRM and work around it and get rid of it.
> With this system anyone will be able to use the satellite given one PL 
> equipped station in the footprint. As common as it may seem to have PL 
> here in the US, this will allow access to more operators worldwide, as 
> well as allow more operators to afford the 2nd radio sometimes 
> required to do full duplex. 2m FM HTs without PL can be had for 
> practically nothing now.
> I think this is the best possible combination of both modes of operation.
> 73, Drew KO4MA
> AMSAT-NA Vice President of Operations
> AMSAT LM 2332

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