swinging signal on Spectrum Analyzer

[craiger62]

I was in our Satellite Production Vehicle trying to downlink a Ku signal. I was not able to tune it in so I checked my Spec An to make sure the transponder was up. What I found was that my signal was drifting side to side (frequency, not amplitude) at a rate of about twice per second. I was running on generator, which has never been a problem before. I also had some high voltage power lines within 20 feet of the dish. I found that I was able to lock on to a larger transponder (Bandwidth, no amplitude) but not the smaller signals.
Has anyone seen this before?

 

[craiger62]

Can I get a little help with this please? Any ideas?

 

[biff44]

If you explained in detail what your circuitry was, someone might have an idea. Without that, all we can say is that you screwed up somehow.