> On Thu, 4 Jan 2007 12:16:14 -0500, Yuri Onipko wrote:
>
> >The noise disappeared at daytime.
>
> Chasing RFI can be a bit like Sherlock Holmes detective work. Think
> of what equipment might have been purchased (or received as a gift)
> at Christmas and used during the evening. Some common RFI sources
> include electric blankets, TV sets, battery chargers of all sorts
> (for power tools, golf carts, etc.), switching power supplies for
> low voltage lighting.
>
> 73,
>
> Jim Brown K9YC
>
I know, Jim. Over the years I used to track down quite a few devices causing
RFI, most recently - washer/dryer at my neighbour's place and faulty timer
on Xmas lights 2 houses away from me. Unfortunately I live in typical urban
area (looks more like your old W9 QTH) where the lot width is 40 or 50 feet
only, so I'm surrounded by at least 8 houses and it's very difficult to keep
track of all junky devices purchased by neighbours lately.
;-))
What I usually do - I start with my Beam (TH6 at 60') to find approximate
direction of RFI on HF and then use my Realistic portable receiver in AM
mode to find the exact source.
But in this case I can't hear this noise on HF, so the Beam is of no use...
I tried to walk down the neighbourhood last night around 11 P.M. with my
portable receiver, but couldn't hear that noise on AM. Probably need more
sensitive receiver with magnetic loop or something...
While I'm typing this (just a bit before 4 P.M. local time, maybe a half of
an hour before sunset) the noise starts to appear for a few seconds with
about 1 to 5 minutes interval.
73 Yuri VE3DZ
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