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A few more data points w/ power supply connected: Supply Voltage | TX Voltage | TX Power | SWR | 10.8 V ?| 9.4 V | 1.9 W | 1.18 | 11.8 V ?| 10.2 V | 2.1 W | 1.18 | 12.8 V | 11.0 V | 2.3 W | 1.17 |

Stan, you must be in Houston, because we have a problem! No matter the freq the signal is present on all L40X coils....there is a whole lot of switchin' not goin' on! -- 73 Karl KI4ZUQ

Hans regularly reads messages posted here, and puts the bugs on his list.? As far as I know such a list is not published.

I have a QMX (80-20) for 12 V that I built last year. It worked fine on FD, and was used occasionally since. A few weeks ago I was running it into a dummy load. Controlled by fldigi. Power was a

Take this one, it's the

?Hi Alan, I measured the voltage on the HC6 socket and found negative .1 volts on one side and zero on the other. All the sockets measure the same negative voltage in the instrument. This obviously

?Hi Alan, I measured the voltage on the HC6 socket and found negative .1 volts on one side and zero on the other. All the sockets measure the same negative voltage in the instrument. This obviously

Hi Chris, Stan had mentioned about Vbat but I didn’t know where to look. The QMX+ was assembled and the GPS module came already installed. Vdd is linked to VBat which I assume is the pre-assembled

Hi everyone, I built the QMX kit configured for 12V operation (the kit was ordered on 13/04/2024 ) , and while everything appears to be functioning correctly, I'm only seeing about 2W of output power

The controller was not powering up from the beginning only when I bypassed the q102 it started. Than my idea was (thanks Stan :)) to trace why I need to do it and found the the micro was probably

Everything else seems to work, but no AGC. As a result, there is distortion on loud CW sigs. Yes, it is enabled in the Audio menu. 027 firmware. Any ideas would be appreciated. Thanks, Dick, K5AND

Alas, the Radtel Speaker-Mic does not appear to be available in the USA from Amazon. 73, Dave K3DX

Damon, I wouldn't enjoy the RX. I wouldn't switch on the QMX in this state. Maybe voltage at IC204 is wrong because of IC503 died together with the PA. Best way is to remove IC503 and check output of

$75 shipped in the Con US -Nate N8BTR

Dan, its a bit risky but I did it with success. You may do it on your own risk!!! Set the supply to 3.0 V and current limit to 200 mA. Remove all subboards and connect the bench power supply direct to

One question, reading older posts in this thread the QMX+ was running. But when and why died the controller now? 73 Ludwig

Good job but bad outcome. To replace the STM32 you need one prepared by QRP Labs. If you are located in W you may contact Jeff Moore or else QRP Labs direct. 73 Ludwig

Nice! I'm using an Anker 10000mah power bank and a 9V trigger cable for a QDX. Runs for hours on it, and the power bank gets dual use when traveling.? Been flawless for me, very clean way to power

My QMX+ died the same way on first start-up smoke test. Perhaps what I have found below may help. You might also want to kill the PA voltage by lifting a wire on L502. ?I did find the known, early

I should add, I've built 3 this way now. 2 run at reduced voltage (7.5v) feeding my Hardrock 50, and the other is a 40-15m "travel" rig that I run at 9V all the time. No known issues with any of them