Fwd: [Premium-Rx] HP8640B

[Christine]

Dear Frank,

i  have the manual for the HP8640B (and have two of them for all kinds
of   rx-testing  (mainly  NF, IP2 + IP3, sensitivity, etc. etc.) and i
had a similiar problem with one of mine. this was a contact problem in
the mech. cavity-tuning, i solved with a lot of work ...

yours, Christine

ps thanks, Baruch, for the nice complement ...


>>       hi All,
>>       I just bought a broken HP8640B off Ebay.
>>       There appears to be a problem with the Cavity.
>>       The output drops very low after it has been
>>       on for a while. I have the procedure for setting
>>       the two levels. I wonder if anyone has ever 
>>       taken one apart or ever seen this problem.
>>       The power supply voltages appear normal.
>>       I wonder if there is a feedback probe   adjustment and the
>> transistor type used 
>>       in the oscillator. This was to be a hanger      queen but looks
>> clean with no cracked gears.
>>       It is the early model with wafer switches.
>>                               TNX,
>>                               fc

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