Hello Steve
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Yes I concur with your findings, once the GPS module is physically removed the QRM which sounds like CW !!!! disappears. However there is still a very high pitched whine audible.
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Also the CW type noise is still there with the GPS module plugged in, however it is at a much lower level.
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I was hoping maybe the very loud static noise on all bands 50 to 180 kHz from the band edges would disappear too, alas no it doesn't. On 10m it peaks at 28.108 MHz on my unit.
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Cheers
Ian G4GIR
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----- Original Message -----
Sent: 08/07/2024 11:56:58
Subject: [QRPLabs] QRM from QLG3.
As the CW-R function does not currently work with the latest firmware version, I have to select LSB for my preferred CW tuning style i.e received tone goes up as I tune HF.
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With this combination I have noticed there is a very strange form of QRM on the bands 24-50MHz, using the digi bandwidth the QRM sounds like someone keying a transmitter for a short period, say 0.25 seconds to 1 second, signal strength S8 ish,? it is not tunable i.e. the same wherever I tune.
I have tracked the source of this QRM to the QLG3 module, remove this and the QRM disappears totally.?
If I select USB the QRM is very much reduced, but still there, CW bandwidth seems to remove the signal, but I don't think its a good idea to have such a strong signal in pass band even if it can be filtered out.?
I wonder if anyone else has experienced this, or maybe check if you have a QMX+ with the QLG3 fitted to see if you have the same?
73 Steve G4EDG
