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I just built a Pacific Antenna mic kit for my QMX+ and it works great!! If you need a mic for your QRP-Labs transceiver kits I would look at this unit. Very simple to build and inexpensive. 73/GL

What power source were you using?

Hello, I ordered a fully assembled QMX in April, and got it about two weeks ago.? It died while i was listening to it. I maybe have listened to it a half hour total or less. i was switching bands and

Hello all.? Just received my pre built QMX low band today into the US via DHL Express.? No tariff / brokerage invoice attached.

Plenty of PA's have inputs nowhere close to? 50 ohms resistive.? ? ?What does the nanovna see looking into the PA ( for interest as impedance will likely change markedly? with input power level )

I have been running firmware 1_02_000 on my QMX+ with good results on CW and SSB (haven't tried Digi yet) since the release of that firmware. So yesterday, I updated my original QMX with 1_02. The

I realized it. I hope he can provide me with one...

Ludwig, Q508 was checked based on the values you gave and did not show any issues.? I did not check d516.? The failure may have occurred from severe rf feed back as right before failure I had qmx

I seldom print anything out these days. I keep all of my schematics and PDF manuals in the cloud, so I can access them anywhere with a laptop, phone or tablet. When building my QMX+ a few weeks ago, I

Robert, this would be wrong. There are rectangular pulses with 0 V for low and 5 V for high and duty cycle 50 %. Your DMM should read the mean value of 2.5 V. If realy 3 V IC503 could be wrong. This

Hi Sergey, It all depends on the design of the PA. Normally you won't use SWR protection in your transceiver if a PA is attached and working. Only if the PA is in pass-tru mode it could make sense.

Ludwig, Yes, they’re all ~3.0v

Recently, I sent my Rev 1 QMX, which I had problems with? the right encoder, and not able to load the new firmware. Mr Moore, troubleshoot the radios, and fixed the issues he found, then did a

WAIT.. . You have to get a new cpu from Hans.? It has a special Bootloader in its prom.

Hello Ludwig and Michael, I followed your advice; IC503 is OK. After testing several ICs, I decided to unsolder the CPU, and now I have no shortcuts between VDD and VSS on the board. The CPU was

Ryan, good to know your QMX is back. Yes, that's my plan to put more information for debugging in the Wiki. Some steps are done. It's a question of time and energy to write more. Did you check Q508

Hmm, I haven't tried this yet, the only dummy load I have is a bird termaline 5w, wondering if that's up to the job?

Ludwig, Replacing ic402 and ic403 has corrected the issue.? The receiver is no longer deaf and passed all hardware tests.? Thank you for the help.? The basic trouble shooting you have written

You just cycle through the menu hitting the <Menu> button without hitting the <Edit> button will show you each setting in order. There are 2 possibilities: FRAME TxS => TX windows to show If you

I printed it in black and white only. When in doubt I checked the colour photos on screen, enlarging them if needed. 20 May 2025 Sal 15:17 tarihinde Richard Dyer via groups.io <rdyer39=