On Sat, Mar 22, 2025 at 08:14 PM, Jim Bennett / K7TXA wrote:
Hi All,
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Just completed building my third QMX+ (the first two were quite successful) and I've come upon an issue that I need help with. The rig appears to work as advertised: receives well, GPS works, RF output levels are acceptable, everything works great except.... when I key down I hear what sounds like a machine gun. It is not there during receive - only when I transmit. Not real loud, but loud enough to be annoying. Happens on all bands, with AGC on or off.
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Any idea what might be the cause, or where to start looking for it?
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Jim / K7TXA
Eagle, ID
SKCC 10447T
BUG 301
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It sounds like it is possible you are hitting a current limit on your power supply and/or the voltage is dropping below the rigs TX voltage limit, possibly rapidly cycling above and below a voltage or current limit.? Can you monitor the input voltage to the QMX when you transmit?
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Brien - KE7WB
Brien - KE7WB