Hello Bill!
My recollections of "oral history":
- What is the reason for requiring all LO's to be locked to a 10 MHz
satellite system clock or are they?
Earlier transponders often had frequency uncertainties of many kHz. For some applications (I seem to recall ranging early in the life of the spacecraft as we're trying to stabilize it and change its orbit) knowing the frequency is important. For general QSOs it is less so, especially with CAT interfaces to radios what can compensate for transponder errors as well as local offsets.
Also, the oscillators so referenced should be able to operate as well as past transponders in the absence of the 10 MHz reference.
Some of this desire may have been driven by the P5A requirements, which don't apply to Eagle. Doing 5 bps DBPSK signaling at S band requires some pretty amazing stability and phase noise characteristics, or so I'm told!
- Have the performance specifications for the 10 MHz clock been
developed and what are they (in particular phase noise, frequency stability, susceptibility to digital hash, and power level available to each using subsystem - to name a few)?
For Eagle, not to my knowledge.
73,
Lyle KK7P