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Al Check out the QRPGuys site ... they have a document describing exactly what you are doing, complete with dimensions. https://qrpguys.com/wp-content/uploads/2017/11/qcx_pcb_chassis_110317.pdf? --?

Hi. You can see my 3D printed case on?https://www.thingiverse.com/thing:2997736??( https://www.thingiverse.com/thing:2997736 ) There is my callsign at the pictures but there is a label "QCX" in the

First, all ICs are in the correct orientation, so that’s not it. I will save the voltage issue on R2 for further investigation. Checking C43-46, I found that C45 faults to ground on both sides. I

Are there any cases currently in stock? If I were to order one just wondering approximately when it would be shipped to the USA.

C6 shows resistance across it of 9.96K, which it should since it parallels R1, so I do not identify a problem there. I get 3.98V at R2 on one side, Charles, It should be 5V on one end. What current is

Thanks for the suggestions Alan. I show 19.91K from R2 to ground, and 9.96K for R1 plus 9.95K for R2. C6 shows resistance across it of 9.96K, which it should since it parallels R1, so I do not

I am making my own case from double-sided PCB.? I like the way the QCX transceiver board is mounted into the QRPLabs QCX case and want to mount mine the same way.? Can someone please give me the

Thanks for the info guys and gal. I did not know the difference between 328 and 328P but did know there is a P version. Carl? AB1ZI

Thank you Hans The QCX kits must attract so many into Amateur Radio (myself included), a perfect compliment to the Foundation Licence for all the obvious reasons. The way 7(2) is written implies there

Maybe this circuit can be modified for what your looking for ? https://hamprojects.wordpress.com/2015/06/29/vhf-beacon-and-aprs-tracker-english-version/

IR2028 https://www.ofcom.org.uk/__data/assets/pdf_file/0028/53965/ir2028.pdf Seems to me IR2028 means any commercial kit, correctly constructed, should meet the various EMC regulations (harmonics down

The basic difference between the two is that the 328P implements the PicoPower standby modes, allowing longer battery life in situations where the processor is inactive most of the time. None of the

Hi Ted As far as I am concerned, the QRP Labs QCX kit satisfies IR 2028. This is my position. If anyone wishes to prove otherwise, they may. However... I predict you may have just commenced a long

I will soon be sitting my Foundation exam in the UK and I mentioned that I was building a QCX 40 to the club that will be running my online course. They quoted 7(2) of the Foundation Licence which

Currently there seems to be no inexpensive 2m (VHF) CW QRP transceiver (kit) on the market. Is there any chance to have a QCX for 2m band? 73 de DO9HC

Charles, Get this right first. It all starts here. R1/2 soldered, no bridges? 5V on R2? No short to ground at C6? 73 Alan G4ZFQ but then I get to the ICs. ?Almost all of them, instead of

Hi Al, Carl Sometimes we use ATmega328, sometimes ATmega328P. It depends only on availability and price, at the time I am purchasing the chips. They are equivalent for the purposes of QRP Labs kits.

I get normal voltage readings at Clk0 and Clk1. ?That's where it stops. ?Voltage readings are very low on the transformer test points (pins 5, ?6, 7, 8) but then I get to the ICs. ?Almost all of

The short answer is the U3S needs to be powered. It is not powered from the Arduino. There's a doc at QRP Labs site covering updating a QCX, but the procedure works the same for U3S.

When using Avrdudess to update the firmware on my U3S, going through my arduino uno, does the arduino power the U3S or does it need to also be powered? Hope this ain't to stupid of a question. LOL.