Tektronix 2722A ?

I 've just purchased the subject generator. I knew it had problems and that is why I was able to afford to buy it. I finally isolated and fixed the major problem and now it does power up at least. I also bought a set of manuals. I am now getting an error code #06 which means a hardare fault within the A6A4 Phase detector reference sum board or the A6A5 Phase detector output sum board. The relative error LEDs are illuminated on these two assemblies. In addition the error LEDs are also illuminated on the A4A4 (Distributor) and A4A7 (AGC) assemblies. while I am sure given enough time I can find and fix the poblems, it would be nice to be able to draw on any experience that could be offered here. BTW, right now I do not get any output at any frequency on the main RF output port. The reference output and the 640 MHz output is OK. Any help will be appreciated. Thanks - Mike

Mike B. Feher, N4FS

I'd be curious to hear what the problem(s) turn out to be. Those are nice signal generators, and built like I'd imagine an interplanetary probe is built, but they are fiendishly complex.

-- jm

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We have 6 of those 8662a's and have them calibrated once a year. They have the best phase noise spec of any commercial generator I've seen, but are notorious for breaking down frequently. If we didn't have so many lucrative government contracts we would of sold them off years ago.

John

It appears, that at a minimum, one of the VCOs is bad. They use two FETs and a varactor for tuning and have 6 inductors switched in to cover the desired VCO range. They are not intended to be servicable, but, I have no choice but to attempt to repair it myself. Even taking one of them apart is a challange. I did buy it for its low phase noise characteristic as I would like to use it in my home lab phase noise measuring test set up. Too many projects and too little time. I will post my results here, and, still, if any one can offer any suggestions it would be appreciated. Thanks - Mike

Mike B. Feher, N4FS

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