>
> That one is sure different! Haven't the slightest idea nor have ever
> heard
> anything like it. Since it seems to be in the area of just a few
houses,
> does it vary with time of day or temperature? If you hadn't said, I
would
> at first thought it to be a steam locomotive! :-)
>
> Wonder what it looks like on a spectrum analyzer or on a 'scope?
It doesn't seem to be affected by wx or time of day. It does
occasionally seem to skip a beat or speed up or slow down for short
periods but not with any discernable pattern.
Sorry, no analyzer here. I haven't put it on a scope, but from the
receiver sound I would assume it would look like noise.
>
> And, thinking out loud, what does it sound like on FM?
Nothing, on fm I can't even hear the pulsing. I can see it on the
s-meter but it doesn't demodulate to anything.
>
> You just might drop a note to Mike, K3RFI, in case he doesn't see the
> post.
Who is k3rfi? I had sent one to w1rfi a while ago but haven't heard
anything back.
>
> Heaven forbid if this is what BPL would be like!
>
> Please let everyone know what you find; never can tell when the info
might
> be needed.
>
> GL & 73,
>
> Tom - WA2BPE
>
> David Robbins K1TTT wrote:
>
> > i have been hearing a noise that i just can't identify, i have
narrowed
> > the source down to an area of 3 or 4 houses about 1/2 mile away from
my
> > station, but need to build a directional antenna to get it down
closer.
> > the real question is what might i be looking for????
> >
> > recording at: http://www.k1ttt.net/audio/rfi4125AM.wav
> > this recording was made at about the loudest peak i found at
4125khz, AM
> > mode, 6khz wide filter. as you can hear it is a pulsing about 2 or
3
> > beats per second. this noise repeats at irregular intervals from at
> > least 3410 to 4365 roughly every 30-60khz, in between the peaks
there is
> > virtually no trace of it. the pulsing is not in sync on all the
peaks.
> > to me this sounds like a multiple carrier fdm power line modem, but
what
> > kind of device would be available that operates in this frequency
> > range?? does anyone know of a source of a noise like this??
> >
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
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