Does the IF error occur below 20 GHz ?? If not, the doubler is suspect - if so, look at the switching or the test set.
Nexg step would be to try and look at the test set VTO. It is difficult because they pipe it directly into the samplers.
Cheers!
Bruce
Quoting ratn9ne@...:
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Wow you guys are fast to help!
Here is some more info: error is only from 20-40GHz, so it has something to do with the doubler I assume. Any span or frequency in this range has this error. I have seen >20GHz work for a little while but only randomly. My next idea is a shorter DB25 cable as mine is about 20 feet long. Tried turning up the LO power coming in on the sweeper with no luck. I can't find a replacement doubler on ebay to test with. These must be very rare. Can they be serviced? This display/sweeper/control box setup has been tested with an 8515 and no errors at all.
