1V RMS in 50 ohms is 20 milliwatts, so low indeed! Take a look at the RF Power measurement section of the QCX manual (section 5.5 in my manual). There are some hints there that may help. Since you are drawing full DC current during transmit, it suggests you have?an open circuit somewhere beyond the PA section, most likely in the low pass filter. Double check the toroid soldering and make sure all the enamel has been scraped / burned off and you have continuity.
On Sat, Jul 22, 2023 at 1:24?PM Mark Volstad - AI4BJ <mvolstad@...> wrote:
Rx on my QMX appears to be working correctly, but I have low/no power output on Tx on all bands. On 20/30 output is approx 1 Vrms into a dummy load; on 40/60/80 it's barely 100 mV rms. On ALL bands, current draw is around 1.25 A during Tx. My QMX is wired for 12V, and that is what I am testing with. During Rx, current drops to roughly 150 mA.
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I'm running the latest firmware (005) and have performed a factory reset. Troubleshooting suggestions? (I have a scope.)?
