|[AMRadio] Radio Noise, BPL?|
Jim Miller WB5OXQ in Waco
wb5oxq at grandecom.net
Sun Jul 13 21:10:20 EDT 2008
This does not sound like BPL Noise to me. However I understand some new
meters transmit their readings to the power company using the power lines.
If this is not the case you may have a faulty meter or problem in the
connections inside the box. I would call the power company. Can you
temporarily turn off a main breaker to shut down the whole building to see
if the problem goes away when load is removed?
----- Original Message -----
From: <doxemf at aol.com>
To: <amradio at mailman.qth.net>
Sent: Sunday, July 13, 2008 7:37 PM
Subject: [AMRadio] Radio Noise, BPL?
> I just finished cleaning and some repairs to my main HF receiver and put
> up a longwire inside the large old factory room outside of my new workshop
> Being inside a building is really not the best thing but this is
> temporary and it's an old 4 story 100 yr old mill built mostly of brick
> and without any other working industry present. Mainly some artists lofts,
> So what I have found is this white noise like signal with clear harmonic
> related intervals from at least the broadcast band up to a significant
> level above 40 meters. It completely overloads the receiver below 80
> meters so it has been difficult to pinpoint the exact fundamental if there
> is one. I am talking about a signal level almost as strong as the local AM
> Some D.F.ing using a portable with a ferrite having excellent nulls
> pinpointed what appears to be the source
> as being a large outside electric meter box supplying service to an
> attached office building about 100ft away from my workshop. The level of
> the RF noise around this panel is unbelievable! This office has not been
> occupied for about a year but the last tenant was a cable installation
> There is no intellegence apparent on the noise or what seems to be a
> carrier buried in it. No AM FM PM or any other form of modulation. The
> level does reduce when there is rain.
> Has anyone experienced BPL this close or have any idea what this could be?
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