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Re: [RFI] "Marker RFI"

To: rfi@contesting.com, Chuck Gooden <chuck.gooden@comcast.net>
Subject: Re: [RFI] "Marker RFI"
From: James Gordon Beattie Jr <w2ttt@att.net>
Date: Sun, 23 Aug 2020 04:29:54 +0000 (UTC)
List-post: <mailto:rfi@contesting.com>

If it goes to 8.5 MHz it could be VDSL.

Check the raster between carriers.  If it is 4.3125 kHz, then it very well may 
be VDSL.  If you don't have that resolution on your receiver, measure to see if 
every other carrier is separated by 8.625 kHz.

Let us know what you have.


Gordon Beattie, W2TTT 


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On Sat, Aug 22, 2020 at 5:36 PM -0400, "Chuck Gooden" 
<Chuck.Gooden@comcast.net> wrote:

When you find it let me know because I have something very similar.  I 
have S-7 across the 40 meters and below.  It is significantly reduced 
above ~8.5 Mhz

Have not had much luck finding it though.

Chuck K9LC

On 8/22/2020 3:21 PM, N4ZR wrote:
> Here's an odd one.  I seem to have a new emitter in the neighborhood.  
> It puts out a broad, T7, rough-but-steady tone just below 50 KHz 
> increments (7000, 7050, etc.) .  It is loudest on 40M - about S4 - but 
> audible from 80M up, and varies with which antenna I'm using. It peaks 
> due east on 20M on my tribander, and the difference between the 
> zero-beat frequency of the "carrier" and the 50-KHz intervals on my K3 
> diminishes with frequency, which suggests the possibility of harmonic 
> origin of some sort.  I can also see it very clearly on my Red Pitaya 
> 122-16 SDR spectrum display with the K3 off.
> Any idea what I should be looking for?
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