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Low Level Noise Spikes, 18 MHZ to 35 MHZ.....As seen on 2M and 70CM Transverters
Need help identify possible sources of noise spikes.
I operate 2M and 70CM transverters, with an IF on 28 MHZ. Recently, I have noticed spikes every 28.7 KHZ (at the IF freq), on both 2M and 70 CM bands.
So, I took a look at 30 MHZ and found the same noise spikes:
Then, I expanded the pass band to see how wide the problem area was. It was wide. Here is the high side, rolling off at 35 MHZ:
And here is the low side, rolling off at 18MHZ.
I did the usual stuff to isolate the source, ending in all AC power one, radio on DC power. No change. I then tested all the LAN components on/off, with no change.
Normally, I do not work 10M, but the spikes on 2M and 70CM when working satellites is annoying.
Any ideas what this looks like?
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