Thread: Nulling QRM
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Old January 14th 05, 06:01 AM
ShortwaveMan
 
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I have had some luck with some stations that have a heterodyne. I set the Dx 394 to 1 khz step and tune up or down by about 2 Khz away from the strongest part of the station's signal and the sometimes reduces the noise enough that the signl is almost clear.

If you have other forms of noise such as flourescent lights, mercury vapor or sodium arc lights and such, I'm not sure you can get much help reducing the noise without moving the antenna farther from the source. Noise coming from televisions, computers and other things that have digital circuitry produce noise that can only be quelled by turning off the equipment itself while you want to DX.

As other posts have already mentioned, matching the antenna at the connection of the feed line can be helpful as well as grounding the receiver; the ground wire should not be inordinately long.

I hope that helps. Keep in mind that atmospheric activities can degrade or obscure a signal. If the ionosphere is not reflecting signals favorably, the noise will win out no matter what you do.

Peace +

"running dogg" wrote in message ...
I've noticed in the last couple days that I can't get the BBC on 9525 at
0300, so I've had to listen to their 5975 freq out of Antigua. The
problem is that 49m is for me full of noise. The noise is so great that
it reduces the BBC to an unintelligible mumble, especially on my Degen.
So I fired up my Yaesu FRG-8800 and tried using SSB to null the noise,
but no luck, even though the LSB setting greatly reduces it I am still
left with a mumble level of audio. The signal is strong, it's just that
the QRM is stronger. I'm using about 50 feet of longwire (my old
antenna) coiled up inside because I can't have an outside antenna for
now. Any suggestions?



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