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<p>I've seen reports from other sources of a wide-spaced,
two-frequency mode, like RTTY but I think spaced 7MHz, may be what
you're hearing. With a standard 3kHz passband you'd only hear one
half of the signal at a time. </p>
<p>Ah, found the email reference, will include below. It was posted
on CWOps mailer, then I saw it forwarded to YCCC mailing list.
But at least, a matching report (from late January).</p>
<p><br>
</p>
<p>Adam</p>
<p><br>
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<div dir="ltr" class="gmail_attr">---------- Forwarded message
---------<br>
From: <b class="gmail_sendername" dir="auto">Tim Shoppa via
<a href="http://groups.io" target="_blank">groups.io</a></b>
<br>
Date: Thu, Jan 29, 2026 at 11:10\u202fPM<br>
Subject: [cwops] The intruder on 40M CW bands past week+<br>
To: <<a href="mailto:main@cwops.groups.io"
target="_blank" class="moz-txt-link-freetext">main@cwops.groups.io</a>><br>
</div>
<br>
<br>
<div>
<div>For the past week+ there has been some on-off keying
intruder on the 40M CW band easily heard on both coasts of
North America. </div>
<div> </div>
<div>It is occasionally QSY'ing anywhere from 7.04MHz to
7.07MHz and may be outside that range goo. It is often on
a whole multiple of 500Hz.</div>
<div> </div>
<div>Although we are most often hearing one CW frequency
with our rigs set at a normal bandwidth, I can often find
an "evil twin" which is key-down while the other one is
key-up, so I think it's more likely to be super-wide shift
FSK. Below for example is me putting receiver 1 on
7.063MHz and the other on 7.070MHz circa 0400Z on Jan 30
2026. You see when one is key up the other is key down.</div>
<div> </div>
<div>The basic signal rate seems to 0.05seconds (20 Baud).
Our CW-seeking brains seem to try to interpret it as CW
because if we here one element at 0.05seconds we think
it's a dit and another at 0.15 seconds our brains.</div>
<div> </div>
<div>I do not recognize 7kHz 20 baud FSK as a standard
encoding anywhere but someone might know better than me.</div>
<div>
<div> </div>
<div>I'm gonna record some longer patches and see if I can
recognize any framing.</div>
<div> </div>
<div><img src="cid:part1.Ug8l0uGN.vpFV2jph@adamooo.com"
width="682" height="251"></div>
<div> </div>
<div>Tim N3QE</div>
</div>
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<p></p>
<p></p>
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<p><br>
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<p><br>
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<p><br>
</p>
<div class="moz-cite-prefix">On 3/29/26 5:50 PM, Andy Wallace via
bars wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5DF7BEBE-FEB5-4579-AAA6-7F983C8B98B5@gmail.com">
<pre wrap="" class="moz-quote-pre">A friend alerted me to basically unreadable CW on 7 Mhz. Sounds like someone with a terrible \u201cfist\u201d. Elements are not 1 and 3 units long that\u2019s for sure.
There are two on right now (21:47 UTC).
7048.5 and 7041.5. Both seem to be repeating the same short phrase. At first I thought it might be a railroad/landline telegraphy net but it\u2019s just \u2026sloppy.
Anyone? Spies? Foxhunting gone very wrong?
Maybe someone should report this as a band intrusion to the ARRL.
Andy
KA1GTT
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</pre>
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