[amsat-bb] Re: PL tone

Andrew Glasbrenner glasbrenner at mindspring.com
Mon Jun 23 17:14:15 PDT 2008

We shut the PL tone off around the beginning of 2007 if I remember 
correctly. We found that the PL tone caused access problems when the 
satellite was very busy, due to competing signals blocking the receiver, and 
no downlink being passed to clue the operators into standing by and letting 
the other guy through. The PL tone also just masked non-amateur or 
out-of-bandplan signals on the uplink, but the signals were still there 
blocking the users, with little chance of being found and eliminated if we 
couldn't hear them.

We have a new PL mode we can try sometime that will turn the downlink on for 
n minutes, and switch to a nonPL'ed uplink for that time. This mode may let 
us run a higher power downlink, but it makes battery management problematic.

73, Drew KO4MA
AMSAT-NA VP-Operations

----- Original Message ----- 
From: "Ollie Eisman" <ollie at ollietech.com>
To: "AMSAT-BB" <amsat-bb at amsat.org>
Sent: Monday, June 23, 2008 7:44 PM
Subject: [amsat-bb] PL tone

> Just out of curiosity, why is there currently no PL tone for AO-51
> access?
> 73,
> Ollie, AJ1O
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