Hello Bill!

I agree with you fully about the frequency agility issue. If it's not 

needed for a mission function, then it could be more of headache than a 

feature. But then some of the receivers on AO-51 are agile and I'm not 

aware of any issues.

AO-51 has 4 crystal-controlled (i.e., not using PLL synthesizer in the 

L.O.) receivers, and one frequency-agile receiver.  The frequency agile 

receiver was a mission requirement.

All of the receivers can be used for command operation, but the 

frequency agile one is so wired because it was "free" - no mass or 

complexity penalty.  That is because the flight computer has 6 

demodulators built in, and a total of five receivers on the spacecraft. 

  It is not intended for use in an emergency recovery scenario.

73,

Lyle KK7P

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