Hi Don,
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Yes, I've been going through the service manual reviewing both the theory of operation and detailed per-assembly explanations. Thanks for the confirmation re. Band 0/4. I'm still a bit puzzled that there is no reference to Band 2 in the schematics, given that the YTM is involved in the x2 frequency multiplication.
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I'm going through the adjustments process in the service manual (it seems like a good way to work out at what point things are not working).? Unfortunately things go off track quite quickly. I'm attempting to adjust the variable gain amplifier to ensure the bandswitch points are correct - and while I can adjust the lower frequency 7GHz point correctly, the upper 13.5GHz cannot be set becasue there is not enough adjustment on the potentiometers.
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thanks
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Tony
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