[RFI] Another Noise Source

[John Gagen]

This has the symptoms of RFI from high speed internet services offered by
the cable TV companies. Many cable companies are now using the HF frequency
bands for subscriber uplinks on this service. I recently had a major problem
here with Cablevision wiping out the 40 meter amateur radio band.

You will have to do some more tracking of signals but put leakage from cable
TV internet service on your list of suspects.

73,
John - W2YR

----- Original Message ----- 
From: "N6KJ" <kelly at thejohnsons.ws>
To: <rfi at contesting.com>
Sent: Monday, September 22, 2003 22:03
Subject: [RFI] Another Noise Source


> For the past few weeks I have noticed a new noise source in the evenings.
> It sounds to me like modem packet bursts.  The noise is fairly wideband
> and pulses (like a packet transmission) with additional "pops".  This
> goes on for several minutes then stops for awhile before it returns.  The
> "pops" sound like sharp little "tick" sounds reminiscent of some of the
> "tick" sounds I thought I heard on the BPL video.  Last night I walked
> the neighborhood looking for the source but didn't find anything.  I
probably
> need a better portable antenna.  The noise seems to stop around 10 or 11
> in the evening leading me to suspect someone has a wireless modem of some
> kind that they stop using when they go to bed.  I heard the noise quite
> loud on 20 meters, but on lower bands it doesn't seem that much worse than
> the usual noise level I have on 40/80.  Any guesses as to what this
> might be?
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