Topband: Spur as it reappeared

[Frank W3LPL]

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 at yahoo.com>
To: "Rick Stealey" <rickstealey at gmail.com>
Cc: wd8dsb at aol.com, "donovanf" <donovanf at 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 at 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>
>