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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

I agree with Tony, I did the grease, too. All good so far, running 9V on a 9V build, no fan. Here's a link to a few pictures,? the uploads here get overwritten eventually:

Hi Jack I see your ICOM microphone has 2 buttons on top ! Would that be an option to wire them in to the 2 on front of QMX+ ?? Or not useful..... Cheers Gert

Hello Everyone, been a while. Moderator, If this is against the list rules please delete it. The other day I got a message requesting one of those cases I used to sell for the original

Hi Ludwig Yes i now have variable voltage and current supply. Resolution of current limit is 100mA. Yes a different result, i was surprised, too. This was measured after trying the new SMPSUs. I

Dan, different to Mar 23 (2.3 k) but why? Some element connected to Vdd maybe broken, in the worst case the controller. I will you more info later. One question; do you have access to a good bench

Hi Jack, I also have a Heil ProSet Elite iC headset. Would you be willing to provide your adapter wiring details? Thanks Errick N9DWD

reminder: this radio booted up and transmitted before I shorted something near the PA. update: new SMPSU boards arrived, I tested before installation, as per the wiki article, and they seem fine. I

To be clear, that spike to 5.7v under worst case 12v supply interruptions would not have damaged anything on the QMX+. Also, the QMX+ has 470uF on VCC at C107, when I repeat the test with 470uF added

Dear Ludwig Here follows the next chapters! I have removed Q102 and Q101 and tested the LIN_REG_EN at the gate of Q101 I got +/-0.6V when pwr button is pressed. So my LIN_REG_EN is being puled down or

You’re on the right track. I suggest you use a very thin layer of thermal compound between the heat sink and flats of the TN0110’s since you’ll be using it in a high-temp environment and a small

Bug in firmware beta 1_01_003 display during Tune SWR: When I choose Hardware tests and then Tune SWR from the QMX menu, the screen shows a frequency, the tune %, the band, and SWR:. Pressing the