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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