[RFI] Interfering signal on 40 meter

[Chuck Gooden]

You will have to post a lot more details here like a waterfall from 
HDSDR or some other SDR receiver if you have one.
If you can turn off all of your breakers in your house or apartment and 
run the radio on battery.

Or turnoff all of your breakers EXCEPT the one for the radio.  If the 
noise is still there run an extension cord to an outlet on a different 
breaker.  Then turn on that breaker and shut off the break that powered 
your radio.  If the noise is still there it most likely inside your 
house and probably in your ham shack.

Are there other frequencies that you hear the signal on?  Try tuning up 
and down and see if it repeats.  Also be sure to check harmonics above 
and below 7103 Khz (ie 3.551, 2,367 mhz and 14,206, 21,309 ect)

I had a Unifi network switch that generated S9 noise level across a lot 
of frequencies.

If its not in your house its time to start DFing the signal.

Chuck K9LC



On 3/21/2024 2:24 PM, Kenneth G. Gordon wrote:
> Over the past several weeks, I have been hearing a constant, intermittant signal on a
> frequency very close to 7103 kHz.
>
> It is a steady, repeating carrier, sounding like someone is repeatedly and constantly keying a
> CW transmitter on and off.
>
> I have not yet looked at it with a spectrum analyzer, but I am curious if anyone else here has
> noticed this "thing" and if you might have a clue about where it is coming from,and what,
> exactly it might be?
>
> Once in a while the signal will change characteristics for a short while and sometimes the
> length of the dashes will change slightly, but it always reverts to the relatively short and
> continuous intermittant dash.
>
> Ken W7EKB
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