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Old 8th Mar 2018, 6:22 pm   #3
G4WYZ MikeyP
Triode
 
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Join Date: Nov 2012
Location: Chorley, Lancashire, UK.
Posts: 21
Default Re: Racal 9081 repair questions

Hello.

The Phase Detector Assembly is 19-0846.
The tuning voltage I have miss-stated it should have been the varactor voltage.

It's in lock now, it's when I rotate the 'Tune' control even at a rapid rate, I don't get the required varactor range. The ROM which controls the upper and lower frequency stops, for some reason mine is 496 to 560MHz.

Had a further look this afternoon with a logic analyser on the Blanking circuits, as when I applied an external supply to the varactor, monitoring TP9 in the time domain 828us (256MHz) to 480us (520MHz)
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