Russell (r....@totalise.co.uk) wrote: 

>> I'm looking at an ambient scan starting at 32dBuV/m @ 30MHz, dropping to
18dBuV/m @ 70MHz then gradually (with small peaks and troughs) rising to
41dBuV/m @ 1GHz. <<


Russell,

Are you sure these are room ambients? They might be the analyzer noise 
floor.

Generally, a decent room will not admit signals high enough to be seen
above the instrument noise floor. Even a poorly built one should attenuate
60 dB or better and only show a few, discrete ambients from  nearby,
high-power sources.

Cortland

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