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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

James and John, I have seen this on a damaged Rev 1 QDX that I bought from a Ham that did not want to try to repair it.? At first, the QDX would power up and connect to the PC using PuTTy.? After

I can confirm this observation.?However, this does not seem to apply to the interference that occurs when nearby stations are transmitting at the same time. 73! Simon

Have a look at the output of the supply as you plug and un-plug it. DC couple and trigger off of the output and you are looking for spikes and excursions during turn on and off. Repeat by connecting

I ran into the same problem with a MIL SATCOM terminal I was working on.? Since blue-yellow is 1/10th or less common than red-green, which I also have, we ended up using blue-yellow LEDs and

James, That is a sad and surprising result. At least you have an answer now. JZ

Thank you for your help. I removed the TCXO and L15 and still found 7 ohms to ground on 3v3. I never actually thought to put my finger on the MCU as I didn't consider that as a possibility, but

Removing L15 will disconnect the clock generator from 3v3. That might be a good test. I hope it is not the MCU. I have never seen a QDX MCU fail. JZ