Re: Strange/Poor Power Performance QMX+
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Hi there. You should start with examining SWR bridge then trifilar transformer.. These are two CRUCIAL parts to get it working right. ? Of course I assume You did all the sweeps on dummy, but looking at your SWR sweeps, apparently something is not OK. You did not attached close pic of PCB so hard to tell but please compare your SWR and RF sweeps with my QMX ( They're similar in general, your 80m RF sweep looking exactly as mine LOL and nothing we can do with it ) ? BTW, I was 200% sure I did not made any mistake, pffff, I am working with RF daily and such things are POC, but we are human. Errare humanum est ;-) ? If anything drop me a line. ? 73 Greg SP3RNZ ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of groups.3dxvx via groups.io
Sent: Sunday, October 06, 2024 11:56 PM
To: [email protected]
Subject: [QRPLabs] Strange/Poor Power Performance QMX+ ? I recently bought a QMX+ and had a lot of fun building it and using it so far, but, my biggest problem is the inconsistency of power over the bands. I've tried quite a bit of stuff suggested (re soldering, touching up the joints, verifying continuity, etc.) but I am now out of ideas on what to do. I've attached photos of my RF filter sweeps, SWR sweeps, LPF sweeps, and I/Q sweeps. I am out of ideas on what to do and just want to make sure I am getting the most out the device. Also I am sorry if I am heading in the wrong direction with this, I am new to the hobby.
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