Spurious signals in VHF 135-150 mhz band?

[rgrokett]

I am trying to isolate a spurious signal that runs a portion of the VHF band. I see a series of spikes 25khz wide every 61mhz from about 135 mhz to 150 mhz. See screen shot.

I know these are from an external source as they disappear when I disconnect the antenna. (an external discone antenna)
Also, I know they are not SDR related, as I hear them in my 2 meter radio and its rubber duckie.

My best guess is a noisy power switching supply? (but there are lots of 'em around here. I'd probably have to kill circuit breakers to stop them)

Any ideas?

Russell

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