|[AMRadio] Radio Noise, BPL?|
Jim Miller WB5OXQ in Waco
wb5oxq at grandecom.net
Tue Jul 15 00:16:02 EDT 2008
That is indeed strange. I can think of wireless intercoms, wireless light
controls etc that use the ac line for their carrier usually at low
frequencies I believe. I really cannot think of anything else right now.
----- Original Message -----
From: <doxemf at aol.com>
To: <amradio at mailman.qth.net>
Sent: Monday, July 14, 2008 1:59 AM
Subject: Re: [AMRadio] Radio Noise, BPL?
> This meter/inlet panel is on the outside of the attached office building.
> The distro panel it feeds is turned off via the main breaker since the
> building is vacant at this time. The the much larger power drop and panel
> for the main building where my workshop/storage is located is on the
> opposite side of the main building and is not a source of noise.
> The noise has the fundamental sound of a network cable but without any
> traffic. Looking at my IF with a scope, the waveform is a flat top
> positive going pulse with even spaced harmonics maybe, 100kc or less
> apart. Certainly not phase controller harmonics. I haven't gotten all my
> gear up and running yet so some of what i'm seeing may be from front end
> Need to put in some input attenuation to to find the fundamental and
> actual signal level. It appears to be in or even below
> the broadcast band but the HF receiver only goes down to 1500. At that
> point the noise level completely buries any broadcast stations. Will try
> using the portable if it stops raining Monday.
> My Spectrum Analyzer, Tek 7L12, was heavily smoke and water damaged
> recently and I'm a bit lost without it. There is no better tool to locate
> and identify noise sources. At least one that I can afford.
> Don't know, have to get it removed somehow. Would like to get my station
> back on the air and there is no way with this noise.
> It is way outside
> of a permissible radiation level whatever it is.
> Will update when and if the problem goes away.
> Thanks !
> Bill, KB3DKS
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