>> ... AO-27 ...
Because of the satellite's limited power budget and a desire to maintain sufficient battery capacity for as many years as possible, the amateur transmitter on AO-27 is on for only part of the daylight portion of each orbit. As of September 1998, the satellite passed its five year design goal with minimal signs of battery degradation, so this operating philosophy appears to have been successful.
AO-27 is available on daylight passes over the Northern Hemisphere.
The 0.2 second tone bursts use to contain the stations' position, course, speed and brief status.
... SO-50 ...
A little finicky to work. NOT a constant-carrier satellite ... Keep tracking and listening - you'll work it!.