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, -- Mark L. Hammond [N8MH] _______________________________________________ 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
