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When Elecraft introduced the KH1 a year ago, I was immediately enthusiastic about the concept. A small and lightweight shortwave radio with an integrated telescopic antenna. This means that, weighing less than 400g, it can be used in any suitable location on shortwave. So I wanted to build something myself. I immediately began my own experiments with telescopic antennas for 7-30 MHz. This confirmed that a counterweight is absolutely necessary. This wire, which is a quarter of the wavelength long, contributes significantly to the radiated energy. So the idea arose to forgo the telescopic antenna and experiment with end-fed wires twice the length. Of course, it makes sense to stretch the wire as high as possible. But I also got respectable reports with EFHW lying on the ground or in bushes. In this place the antenna may detunes itself, so a tuner is necessary, as well as the standard 1:64 transformer (Unun). The tried-and-tested resonance circuit (Fuchs Kreis) performs both tasks. Once the antenna issue was resolved, QRP Labs brought out the QMX. The ideal TRX for my projects, and now even capable of SSB. Now all that was missing was a suitable housing with an integrated battery and a speaker with an amplifier. Then a paddle for CW as a contactless touch key directly on the device. And the QMX Carrot was finished. But it wasn’t that simple, because everything had to be as small and light as possible. It now weighs 340g and measures 15x8.5x3.0 cm. I’m happy with that. 73 Chris https://youtu.be/0kksiWVOtnQ

Hi, I have released a version 1.2 of the solution. Please refer to the readme front page file at the git repository with details: https://github.com/AC8L/QMX_Plus_Autotuner_Internal_Battery_Speaker/ While I am writing this note - a group buy with 35+ participants is happening for this same version 1.2 - organized by Cal (AD8Q) and Stan (KC7XE). -- 73, Sardar (AC8L, 4K6SA, VA3DUA).

I purchased the development kit with my QMX+ because I thought maybe I'd install a tuner. I did and although I can't drill a hole in the right location to save my life, out of laziness for sure, I was able to do it this way. I decided not to make it totally internal as I run an amplifier sometimes. This way, it's just a tuner that uses internal power so it comes on with the radio. Pretty handy, too. It works just like I hoped and it's one less thing I have to pack. Given the choice of an internal power source or this, personally, I think this is more convenient. It make look trashy but I also added a high quality speaker. The holes looked fine but given the conditions I will likely use the radio in, I decided to keep dirt out. 73 Frank

While building my QCX mini, I damaged my R47 variable resistor while trying to remove it, because I forgot to cut off the feet before soldering it in. I finished the rest of the build a few days ago, and discovered when I powered it on that the display contrast was set well enough that I could use it before the potentiometer came in. However, while I was unplugging a paddle, the screen suddenly went blank and hasn't displayed anything since, even after installing the replacement potentiometer today. I suppose it's possible I shorted something with my finger? I have an enclosure on the way to prevent further incidents, if so. After reading through the manual, I decided to take a reading on the pins of the display module, and they don't match very well with the expected values. With R47 turned 50%, the voltages I read on pins 1-16, respectively, were: 0, 4.7, 1.5, 0.1, 0, 0, 4.7, 4.7, 4.7, 4.7, 2.6, 1.8, 4.7, 4.7, 4.4, 0. I'm not sure if that's useful information or enough to help you debug it, but I'm happy to provide further detail or information you might need to help me get this fully working. While the screen was working, I was able to get it set up and tuned, and listened in on a few frequencies and it seemed to be working fine. TU es 73 de W5JIA

Howdy all, I finally was able to get the QMX on the air last night since having it for over several months now. Mine is setup for 9v and I’m using a wall wart tO power it at the moment. It worked well on CW, making a nice contact and qso to KS from NV, and then several Digi contacts to China, Argentina, NV, Japan and New Zealand, using the iPhone iFTx app. I didn’t see any output from anything in the screen but still need to play with the settings. Thanks Hans for a great little rig. -- Jason- Wv3v Las Vegas, NV.

A completely different approach to the HTML console published on this forum but as I use Flrig to control my rigs and flrig does not support Hans' excellent recent additions to the CAT codes, I am developing a widget which supplements flrig. Currently, this allows for the selection of new modes, indicates the LCD contents on your PC, and has meters for signal, SWR, and power. This can be seen in operation here: https://www.youtube.com/watch?v=lr-OomSTS7U Anyone wishing to try this out, then it can be found here: https://github.com/sipsmi/qmxwidget It's just proof of concept at the moment, and I will get around to tidying it up, but it works and I find it useful. 73 Simon G0FOZ