I see the same thing on 75 and it tends to drift and appears every 10 Kh
or so
)(#$*%_)(#&*% switching powersupplys

sounds like power line noise

Bob K3DJC
On Wed, 09 Nov 2011 16:29:16 -0800 Vic K2VCO <k2vco....@gmail.com>
writes:
> Has anyone ever seen anything like this? It seems to be there 24-7.
> 
> <http://www.qsl.net/k2vco/160noise.jpg>
> 
> Another view with a wider span:
> 
> <http://www.qsl.net/k2vco/160noise1.jpg>
> 
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
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