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Hello Martin, If you are on a Windows version, have you tried using the "listen" feature on the sound system?? How you get to it is dependent on your version of Windows.? For Windows 11, it is

New broken QMX+, need repairhelp in Sweden. Regards Roger SM7RYR Contact: sm7ryr@...

When I have the QMX+ set up for WSJT-X I have to select the QMX for Audio in and out.? Now I don't have the sound from the Pc any more. Is there a way to have both? -- Martin DK3UW

I used a Baofeng microphone in which I put a new 50 ohm, 1W speaker and a new microphone capsule. I am surprised how good and loud it sounds in the new speaker without any amplifier. I removed the

Chris, I wish you would not use these, obscure to me, acronyms:-) But you did post " one way to check the power connectors is to use a meter in diode mode with the power reversed so I can see the

After months, even years of thinking I eventually ordered another QRP Labs kit today: a QCX+. I had previously built a QDX Hi Band and am satisfied with it. I followed closely the development of the

I don't buy this, sounds like FUD to me. > > > My meter in diode mode generates 3.9V and, crucially 1.5mA.? This into a circuit that's protected from reverse voltage by the TVS diode, Q103 and

Hi Gary, Mine is the same. I can't get it to complete on any band. I have spent several hours messing with band edge and center frequencies. It didn't seem to make any difference at all. Resetting

Also inspect carefully the interconnect of the LIN_REG_EN signal fromthe smps card to the main board, ensuring nothing there is pulling it down.

I think the issue is that 12V pushes the voltage rating on the BS170's, and the increased current at 9V for the same power, ends up pushing the current rating of the parts. Paul -- AI7JR

I just finished playing in the CQ World Wide SSB contest! My setup included the QMX+ (firmware 1_01_003) and a 3-el yagi at 15 metres above ground. The QMX+ performed beautifully. I made 118 contacts

That was it!!! Do you have any spare diodes to replace it with? I don't have any and I don't want to run it without. [email protected]> wrote:

On Sun, Mar 30, 2025 at 09:00 PM, KK4ITX John wrote: I do not know why the components after said toroid get excited if less than 12v is used if built for 9v….. I am basically a math guy. Because

I know that he built it for 9v, same as mine. I know that one can choose to build it for 12v input by a small change in the winding of a toroid. I do not know why the components after said toroid

Sepehr, you could use this cheap converter whill will give you a steady 9V:

Packing up my rig etc and closing down here in Oak Island ( OKI ), North Carolina and heading back to the New River Valley of Virginia this week. So, I just had to break out the clip leads one more

The device can be built to either handle 12v or handle 9v; the person asking the question here built their radio (the transformer part, specifically) for 9v. 73 -- Matt N3AR

There doesn’t seem to be a clear consistent answer, the manual implies “a little over” is OK but does not define “little”. I admit that I don’t understand how a device that can handle 12v

You could use 2- 7809's in parallel for added current rating or 1-78S09, which I think is good for 2 amps by itself. Your input voltage just needs to 3 or 4 volts higher then the needed output

You could put a small buck converter or a couple of diodes in the line to drop the voltage into acceptable range. -- 73, Dan - W2DLC