[Boatanchors] Peristent, annoying, intermittent, elusive QRN problem: help please!

[Ron]

Hi Will.
I have done some work in CE certification of Medical Equipment.
Get your rig off the AC line to isolate the power and run it from a battery source.
This will at least define if the noise is conducted through the power buss or
radiated through the antenna.  From there you will need to look for a source that is
pulse in nature in that your problems broadbanded in the frequency domain and that
translates to an impulse in the time domain.
In that it is on and off during the dark hours make it difficult or easy to find the
source.  A heater would go on and off but would chance duration with temperature. A
light would be steady during dark.   You will just have to figure out something that
is a combination of both and when you find it you will be amazed that it was so
simple.
---
Ron


Will White wrote:

> I have a local noise problem I am hoping someone can help me track down.  I hear
>
> S-6 or 7 loud, 'coarse' has on all HF bands, on all frequencies, though the
> intensity of noise diminishes somewhat on higher bands.  On 40M, my main band,
> it is all but intolerable, making QSOs with all but the loudest stations
> difficult, even at 12 WPM or so.
>
> The noise comes on for exactly 2' 15", and goes off for exactly 1' 25". Over and
>
> over. I have timed it many times over two weeks.  The noise is only there after
> dark. Aha! But I have searched and searched for an intermittent streetlight, to
> no avail. I have gone about three blocks in all directions from the house in
> this search, and also looked for automatic driveway/porch lights nearby, but
> can't find any. What the &*%$ can this be!??  I am really puzzled by the exact
> timing, since it would seem that a streetlight malfunctioning wouldn't do this,
> and a driveway light might stay ON for a specific time, but not off! HELP!
>
> --
> Will White, KD7BFX
> Seattle WA US
> King County, Grid CN87tq
> ITU Zone 6, CQ Zone 3
> ***************************************************
> "The wireless telegraph is not difficult to understand.
> The ordinary telegraph is like a very long cat.
> You pull the tail in New York, and it meows in Los Angeles.
> The wireless is the same, only without the cat."
>                                                       - Albert Einstein
> ***************************************************
>
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