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I've been thinking of adding a band output to my QMX+. Then the antenna tuner already knows before going to the show which band he has to work on, uses the successful settings of the same band last

Thank you Stan, Is the prosigns <VE> standard? https://en.wikipedia.org/wiki/Prosigns_for_Morse_code -Adam KD9AIE

Now finished thrird QMX+. Same problem! What is/what do i wrong?

My not so humble opinion (because of 65 years of experience and many mistakes) is this: Forget an automatic tuner with a QMX or QMX+ or any QRP Labs radio. With an antenna that is not matched

Now - only blocks on display no matter what contrast setting is. I made contact using putty. I set the system config to QMX+ 160-6 and then went to hardware tests, diagnostics. 5V SMPS status is

Thanks Stan I found good resistances on the main and display board. Pulling the 5V SMPS on careful examination? I saw a doubtful connection. Cleaning that up and I now have 5V on the board, the

Hallo Mike Thank you so much for your reply and advice. You hit the nail! Now everthing works perfectly! HB9BAB/Jürg

Same problem here with two new builds of QMX+ (PCB Rev 3). Have some experience with build of QMX but never have this problem before. Checked all components and the soldering but all looks good. Any

Hi Jason, I had the same idea as you. It's possible to build a z match like Kanga or ZM-2 into a very small box, together with a resistive tuning bridge and a common mode choke. It's fiddly but not

Dear Folks: I have been having fun with the QRP Labs amplifier driven by my QCX Xcvr.? However, I have the amplifier powered off the shack's 13.3 volt supply (the QCX supplies just under 4 watts of

Hello Robert I agree, and I will make this edit to the next manual update (Rev 3 board); I don't think it's critical enough to warrant spending time updating the Rev 2 manual. 73 Hans

Adam, I'm not sure about the QMX behavior,? but the ! is not defined in the international standards for morse code.? So it is not surprising that QMX doesn't use the value you expect - there may be

I have followed these discussions for months. What I have taken from them is that an automatic tuner is not a good choice because of the mechanics of most of those devices. There’s many MANUAL

Ludwig, thank you for your help on these QMX+s. Perhaps I should have started my own topic and will do so in a few days after my USB C to USB cables arrive. I will then be able to run the tests from

My QDX Rev 4 is receiving just fine on 30/40/60m but nothing on 20m. It was working on 20m some while back. I've reflowed L12 and C29 several times but no joy. Perhaps C29 has gone kaput but I

Check and see if you still have 2.5V on VCC and to the front panel.? That is abnormal, it should be 5V.? So something in either the front panel or the main board is pulling down on the power supply,

This is stunningly brilliant, Hans. Your creations are truly awesome, and fun to use! I shall have to buy another kit soon to help keep your operation afloat... 73 Steve N1XNX

Thanks! Dave

Link to one example at Amazon. https://www.amazon.com/3V-12V-LM386-Amplifier-Module-Adjustable/dp/B09FX7TPP9/ref=sr_1_24 If there is a reason to be concerned about bass response of a small speaker,

Hi Yes, it's just a button you press and the calibration happens by itself, and is specific to the actual hardware being calibrated. The only necessary pre-requsiites are: - Connect a 50 ohm dummy