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Hi, sorry, I just saw that this thread had been updated. Yes, the box design is from Thingiverse. If you need the stl file for ? QCX 20m ? I can make one, no problem.

Chris Wilson 05 February 2018 The current U3S firmware is 3.12a nd comprises just a hex file, no .eep file. If I load V3.12a hex file onto a new Atmega chip it will not have any of my settings. To

Hi Olaf, I did not check the Tx on a spectrumanalyser (yet) , but I did check the tone on another receiver. Tuning up and down showed nothing different.?On Rx there is no difference in received noise

Hi Martien, running 1..3? high capacity Lithium cells in combination with? a? up converter seems to be quit attractive? ..? good to hear that you have no extra noise noted.? ? Wonder if you

Steve, You are sure the frequency is exactly correct? The default GPS configuration takes a long time to adjust it. On what bands? Little-used bands may not have a spotter within range. 73 Alan G4ZFQ

John, 5K After D3 polarity protector? If so then it could be something other than a whisker. The 7805 will not take 2A. Is it possible that it went into TX mode without a dummy load? If this is

Thanks Alan. You are probably right. I tried that. The 12v line is not a dead short. It measures ~5K. Something is drawing current. The 7405 is putting out 5v. John k1ym Sent from my iPhone X

Guys, Thanks for the suggestions. I don’t intend to operate from batteries whilst charging, I’ll just make up a couple of battery packs for portable use, when one gets tired I’ll swap them over.

I have also used a similar module with some success.? I published a small inline enclosure here..?DC - DC LM2587 converter module case by G8XUL | | | | | | | | | | | DC - DC LM2587 converter module

Hi Steve,? I use a low cost?Lithium Ion pack. Now these batteries are usually not 13,8V, more like 12,2V and when you transmit even a little less. That has a negative effect on your output (mine

John, It seems likely that an ohmmeter will find a short circuit to ground on the 12V line. Maybe a whisker of solder, look carefully. 73 Alan G4ZFQ

The files are available to anyone. I printed the short version in black and it is nice case. I am using CR-10S printer. https://www.thingiverse.com/thing:2661221 Dave KI7DPP

I am getting current drain of over 2 amps when I connect 12 v. I see that is not correct. At first it was just a few mils and I briefly saw the proper display as I adjusted R47. It was touchy, not

Kind of moot point but... I bought one of the cheap RLC 328 testers on Ebay. Not hoping for much I stuck in some caps and coils. Measured them to within 1-2% of the value. Hummmm...Tested diodes and

A handy, cheap option for powering the QCX would be the 18650 cells commonly used in e-cigs. ?Chargers and cells are commonly available at every vape shop. ?You can get battery holders that put 3 in

Hi folks! We built five U3S kits in our local radio club reported at http://e09.de <http://e09.de/> After assembling everything we`ve now trouble with 3 kits. The system starts correct, the GPS-modul

Thanks to Alan, G4ZFQ and Tim, KB2MFS. They have put me on the right track, and the suggestion to search the message archive is right on. I’ll do better next time. Now to wait for parts… 73, Pat

Hi Alan. here some picture/video to show the display. Answer to your questions: I changed exactly the same LCD-module, wich runs certain days perfect, but then the same behavior, and still the US3

Kent, Your picture makes it clear! Either R42 is open circuit, test with ohmmeter. Or Q6 is open circuit. Unusual, they usually fail short circuit but either way is possible. I'm thinking this is what

Steve, I did something similar to produce 48 V with a stack of NiCds for powering a Heathkit generator for tests in a railway tunnel (no mains supply on the Bevercotes line). The charger was