Hello, Just worked AO-51 without 67Hz tone. I noticed that the carrier drops out sometimes. I guess you activate the carrier again with subtone but i'm not sure. 73, Eric.
Amateur Radio Station ON4HF Eric Knaps Satellite manager UBA Tel. +32472985876 (mobile) http://www.on4hf.be Op 21/04/2011 15:09, Mark L. Hammond schreef: > Hello AO-51 users, > > As you have noticed, AO-51 has recently experienced a few shutdowns > due to a low battery voltage trip. This is because of increasing > eclipses (now at 20 mins per orbit and increasing), poor sun angles > (still getting worse), and a "weak" battery. > > We are now using the 67 Hz PL tone required mode in order to turn the > transmitter(s) OFF when not in use. The transmitter power is down to > about 550 mW. We will continue adjusting various parameters, > including transmitter power, trigger voltages, etc. in order to keep > the battery temperatures reasonable. Keep in mind that the power > management feature keeps the transmitter(s) OFF during eclipses, so > you can't bring it up even with a PL tone while the satellite is in > eclipse. > > Here is our current schedule, which will continue until further notice: > > AO-51 Schedule > > Mode V/U FM Voice Repeater (**67 Hz PL tone required**) > Uplink: 145.880 MHz FM (Temporarily from 145.920) > Downlink 435.300 MHz FM > > > The AO-51 Command Team can use your help! > > 1-Please make activity reports to: http://oscar.dcarr.org/ This is > very useful to all users. Until everyone knows that the 67 Hz tone > is required, we might see some conflicting reports. > > 2-Please help spread the word about needing the 67 Hz tone! > > 73, > _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
