Hi George,
Faulty day/night switches may well be the cause! You may have seen
in my previous email that both stations switch patterns from day to night.
This is the first time I've ever hears of two AM stations with two
antenna arrays sharing the same small site
73
Frank
W3LPL
----- Original Message -----
From: "George Hirst" <geohirst@yahoo.com>
To: "Rick Stealey" <rickstealey@gmail.com>
Cc: wd8dsb@aol.com, "donovanf" <donovanf@starpower.net>
Sent: Friday, January 6, 2023 11:39:10 PM
Subject: Re: Spur as it reappeared
I am “talking through my hat” here. The fact that it seems to suddenly get much
stronger right about your (New Jersey) sunset make me wonder if it is related
to the AM broadcast station(s) changing their antenna pattern(s). (I haven’t
done the research to know if these stations are ones that are required by the
FCC to change their patterns at night to “protect” more senior stations who
share the sane frequency.) Perhaps there is some corrosion on the RF switches
employed in that function that introduces nonlinearities. Those nonlinearities
result in mixing products (ie. 1940 kHz) which are then radiated. ????
George - WF4U
> On Jan 6, 2023, at 4:14 PM, Rick Stealey <rickstealey@gmail.com> wrote:
>
>
> Note the waterfall. The timestamp on the right is accurate. The horizontal
> line is a lightning burst. But notice the ugly signal that came up on 1940
> before the carrier. Anyone have any idea what is happening there?
>
> <image.png>
>
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