For my pocket-portable QCX 20, I use a plain wire dipole, shown packed here. I have checked it with a nanoVNA in various odd configurations, and it provides a decent SWR. The center is simply a BNC fe

Just a note that the putty may not be the proper way to dampen the vibrations here. Due to its flexibility, it will not add much "dynamic mass" that moves with the acoustic wave. Temporarily adding a

Ok, thanks. That will be a tight squeeze, maybe too tight. Could fit 3s 750 mAh LiPo, perhaps. To think about. Torbjorn

Very nice! Good luck with the microphonics issue. (Hmm... How much longer is the cabinet for the 50W amplifier? I may ask if I can buy one to see if I can fit a battery and a speaker amplifier...) Tor

Isn't there a way to dampen the mechanical vibrations from the encoder? Could you try to hold the PCB against some rigid massive object, such as a screwdriver handle, in different locations, to create

It is certainly impressive how you have squeezed things together here. I could not figure out why there is a notch in the controls PCB above the screw tab on the top PCB, instead of just stacking both

Woohoo this looks great! (I would happily preorder to get serial number one:-) I shall have to start thinking about how to integrate battery, speaker and paddle into a pocket-friendly unit. Perhaps wi

For me 4s LiPo works great, but see my earlier post about heat spreader and fuse. Torbjorn, LA4ZCA

I appreciate all the interesting discussions here. To Razvan, just a reminder that your self-contained dream rig can become reality with the QCX if some effort is put into that, for example with my 3D

#qcx

I can report that the arrangement with a polyfuse attached to a heat spreader for the PA transistors actually works. After running WSPR portable for a while into an antenna that turned out to be misma

I run mine on a 4-cell LiPo, but with small heatsinks added to the 5V regulator and the PA transistors. Can't recall if I also changed the input electrolytic, check its rating. Have been running WSPR

Thanks for responding, Hans. I just wanted to add that my suggestion should not be read as disapproval. I actually like the QCX+ for being easier to build, and thereby accessible to more people. And I

#qcx

Hans, I don't think you will have time for this, but here is a suggestion: I sympathize with the thread discussing the larger size of the QCX+. Given the quality of the QCX, many will want the radio m

#qcx

I finally installed the new chip with lower brown-out voltage threshold today. At the same time I installed a 2200 uF/6.4V capacitor across the output of the 5 volt regulator into my 3D printed QCX ca

#qcx

No problem. And no hurry. Have a nice summer, hopefully including some vacation ;-) Torbjorn

#qcx

Reiner, As far as I can see, there should be no EEPROM write activity initiated by the processor, except just after a WSPR transmission where the GPS is read. By avoiding a switchover or switch-off at

#qcx

Thanks a lot, Hans. I have just placed an order with a comment to get the lowest brownout voltage. I will report back here what I find out. 73 de Torbjorn, LA4ZCA

#qcx

Hans, here is a narrow-interest request that you can read when you have time: In my compact 3D-printed QCX cabinet, I would like to switch off the GPS while keeping the processor running. This is very

#qcx

I updated the docs on the sites with links to the switch types I used, out of the junk box. At the same time, I fixed the other links, which were dead in the PDF version of the docs. Good luck, and le

#qcx

I have been running my QCX20 off a LiPo 4s battery with a maximum voltage of 16.8V. It drops off relatively quickly from there, but I have been running WSPR when the battery was above 16V. There has a

#qsx