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Steve, Like Evan I've built mine for 12 volts, run them at 7.5 volts. As I only want 1 watt for WSPR I also have 2 or 3 diodes in series with L14. 4 version 1s, run this way obviously no problem, no

Hi Andy Thanks for the feedback, I added your observations to my bug list to investigate. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Steve, I still have my Rev 1 QDX running.? It is built for 12 volts, but I run it between 8 to 10 volts.? That, to me, supports Hans's statement.? The one mod that I suggest is adding a 1n4148

Hello all, With my club, we are organising a "conference" for QRPers : https://ara35.fr/conf-qrp/ I would want somebody to talk about kit building. Anybody here willing to make a small presentation ?

Hi Steve Replacing the voltage regulator wasn't necessary. It IS necessary to make sure you fit the 10uF electrolytic capacitor across the 12V supply voltage. If that was done, the AMS1117 should be

Greetings from England, I built my QDX vsn 1 from the first batch for 9 volts. Tested it and tried it out then put it aside. Now I want to use it for WSPR. I saw a video which recommended replacing

I had the same problem.? You can order spares from Hans. https://shop.qrp-labs.com/SPAREPARTS/rotary

Good morning, I just changed firmware 16 to firmware 15 and nothing has changed, the QMX still doesn't work well, it only absorbs 100 mA in transmission, I seriously believe that the bs 170

John, I broke a couple of the leads on the switch side of the encoders during assembly. I fixed it by replacing the missing lead with a thru-hole component cutoff (like the ones used on the display).

Hi Dan, fldigi can use QDX transmit CW signal, but because QDX dose not have pulse shaping circuit, if you use it transmit CW, the signal will dirty, so you'd better not do that. 73

Evening, I damaged the pins on one of the rotary encoders and need to get a new one. Anyone know the part number and where I can order one? Does Mouser stock them? Thanks in advance. John W9QP

Thanks Hans. I’m embarrassed to say that I think you identified the issue correctly. After several uses in the field, the Digi mode background noise level seems entirely reasonable. I made several

High-band QMX rev2 (2024), 9V version, Firmware 017.? Powering with a bench supply, limited to 1A at 9V.? Today I made a few FT8 contacts on 20m, with 2.8W power out. That's a good start. I'm very

Same issue with traffic lights that control vehicles at intersections. Red/Yellow/Green. The position of these lights, Top/Middle/Bottom is used to understand their meaning. A similar set up could

Hmmm, I wonder whether implementing colored LEDs as part of a system's Human - Machine Interface (HMI) could run afoul of the Americans with Disabilities Act (ADA). 73 Jim N6OTQ wrote:

Hi Jim, all I'm glad to hear that all is well and it is working but I don't really understand what is UNEXPECTED about the way the PTT output is implemented. It's clear on the schematic that what is

Hi all, here are my test results and the pleasant final results from the working QMX (20 m - 10 m). I've made some steps. 1. Checking the uncertainty of measured values for L I have a set of filter

Bojan, Roy, and Chris - thanks for the replies and tips on how to test that the PTT is in fact working. And surely enough, IT IS!! I metered between Tip and Ring and also between Ring and shield -

Thanks Hans for the quick answer. No problem, the frequency is really accurate. I was fiddling with the QLG2 and found nothing for calibration. But it's not important. 73, Ludwig

Evan, I think your analysis is spot-on correct. The TX pin of the MCU is directly in the line of fire for an overvoltage fault starting at the BS170s. JZ