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Based on the large red warning on page 4 of the QMX+ assembly manual it is clear that Hans intended us to power the QMX (and presumably the QMX+) from 9V and tolerates us modifying the rig to operate 12V at our own risk. It is also clear from the discussions I have been able to find that most people opt for a 12V supply (along with various hacks and bodges to actually run it from 13.8 V or more). Given that, for a real world battery I'm going to need a buck/boost converter to get a stable supply that won't kill the rig 9V is just as easy to get as 12V (Assuming I go for a buck/boost converter rather than the three diode bodge) Given that a hardware choice has to be made early on in the build process I'd rather not have to change this at a later point so would like to pick the right option from the start. Has anyone had issues with running either 9V or 12V that might make one a preferred choice over the other? I've seen Druck converters recommended but here in the UK the choice seems to be limited just one buck converter and that needs a 1.5V overhead so would need a fully charged LiFe or Lead Acid battery to exceed the 13.5V I'd need to supply to get a 12V output. If I go for a 3S LiPo battery the voltage range is between 9 and 12.6V (3V-4.2V per cell) making 9V operation or a boost converter essential. There are other devices on eBay that claim to have both buck and boost capability but I have no idea how noisy they'd be.

Searched but did not find anything - Completed the QMX+ build and was assembling into the case when I found that the front panel PCB will not fit into the case. The case is 96mm inside. The case is 99mm between the grooves The front metal panel is 106mm at the widest point The front PCB is 105mm across. Basically I am trying to squish 105mm into a 96mm opening. Not going to happen. Photos are attached -- Since it is completely built, should I try and Dremel 10mm off the front PCB? TIA Michael, KG5UMH

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