Re: QMX+ SWR sweeps with SSB firmware?
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Okay, I am running? and have run the calibrations, but haven't started adjusting band settings or attempting any SSB yet.? ?This is a QMX+ connected to a mag loop antenna.
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Keying CW on 40m, I got SWR protected, so I Menued into Hardware Tests > Tune SWR and and tuned.? The SWR reported is flickering around 1.7 and 1.8, which shouldn't trigger SWR protect.? ?Ah, but I'm connected to a mag loop antenna, and the SWR reported continues to flicker around 1.7 and 1.8 as I tune the loop all the way to 10m and back again.? The loop tuning is working, in receive I can hear the loop resonance moving as a peak in received noise.
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So I connect the serial monitor, go to the diagnostics page, and T on 40m.? It reports an SWR of 1.2-1.3.??
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Then I go back to the QMX menu to Tune SWR, and now it reports 10.? But I'm no longer sure what frequency the radio and the antenna are tuned to at this point.
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Then I turn the radio off for an hour.
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And when I come back I open the Serial Monitor, navigate to Hardware tests > SWR scan.? It scans from 3MHz to 9MHz and reports 10 for every frequency.? (But I realize later that I might have overlooked a dip at the resonant frequency, they can be easy to miss.)? I go back to the radio and tune the mag loop for maximum received noise.? I do another SWR scan it now reports 1.95 to 2.1 for every frequency in the scan.??
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I go back to Hardware Tests > Tune SWR and it now flickers around 1.9-2.0, but the SWR now responds when I tune the mag loop, and I'm able to tune it down to 1.33.? But I get SWR protected again before I can send my whole callsign.
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I begin to feel like an unreliable witness at this point.? I go back to Hardware tests > SWR scan.? It draws 10 except for a small spike down around 7.? I peak the antenna to 7025kHz and scan again, now I get an obvious and substantial spike down to 1.5 SWR.
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I'm sure there's a reasonable explanation for all this.
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-- 73 -- rec -- ad5dz --
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