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Hello Juan, there are many possibilities. ?So it’s a difficult question to answer. ?Is this a QMX that you built or built from the factory? ?Is this a Rev 1 or a rev 2 QMX? ?Do you have any test

Hello everyone! Please I need help. I am not undestand nothing of electronics and I want know the reason why my QMX is without audio. I only turned it on once and I could only make one qso, then there

Having recently built two QCX-minis I am once again in the building mood. I hesitate to tackle the build of a QMX as I am seeing a lot of email on the reflector about QMX failures! My question...have

Hey Phil, Thanks for the idea. My low band QDX does not do that even without any antenna connected and the High Band does so I'm thinking it must be something else. Recovering from the RSV that's

Jindra, At the moment the QMX will not work with fldigi. There is an issue that was created when firmware 007 was released that prevents it from working. Hans is aware of this and hopes to resolve

Check the thread started by Hans-Wilhem on 12-27-2023. [email protected]> wrote:

My qmx got out to a park yesterday too.? Made a bunch of cw contacts on 20 all across the us.? A buddy brought along an ATU-10 which worked great with it.? I didn't hear cw clicking that other

Andrew, Check the mux bias voltage at the junction of R401, R402 and C406. It should be close to 2.5 volts. If it is significantly different, it is highly likely that IC402 has been damaged while the

An alternative to a milliohm meter is to carefully unsolder and lift individual pins on ICs that connect to VDD. ?When the short goes away, you have your culprit. ?This is tedious and not easy. ?I

Hi Andrew, I think this mistake was due to some changes in this sections of the circuit between Rev 1 and Rev 2. Now pin 9 of IC402 is connected to T401. vy 73 de Klaus, DG8RCN

I believe the pin 7 of IC402 mistake is actually supposed to be pin 9 of IC402.? It has been corrected in the latest versions of the manual. -- 73, N4TVC, Randy

Hi, Looking for troubleshooting suggestions/help please. I have built the QMX and all is working fine except there is no received signal.? The audio stages appear ok as I can hear my own signal and

VARA cannot work with the QMX as it is not one tone at a time. RTTY should be OK. Gary W9TD

Hey Cliff, I had an early problem with this way back when I first got the QDX. In my case it turned out that the BNC connector was not making real good contact on the center pin. A little bit of

C525 is a thru hole ceramic capacitor part. Digikey should have them. 270 pF 50V C0G, NP0 Through Hole Ceramic Capacitors | Electronic Components Distributor DigiKey (

Hello Razvan On QCX if you wish to change the center frequency you must do so with hardware component changes since it is analog. You can also change in the configuration menu, the CW offset to match

Thanks!!! <philip.r.green@...> wrote:

Hi Jo! My QMX high band had initially also around 3W output which I found a bit meagre. I tried LPF1 and then I had too much output to feel safe (I think it was 6.7W). I went back to LPF0 and fiddled

I've been catching up on my YouTube videos and just published a September POTA activation using my QMX and a modified PAC-12 antenna. I also used a KN4YB bug, which was a little scratchy at first. Not

Ronan, The mod addresses a problem that is exhibited by Rev 2 boards only. So far, Rev 1 and QDX appear to escape the problem. JZ