I can't find any references to this in the messages, but the last step for mounting the leads of T1 (P23, step(15)), says to put the remaining end of secondary 3 into hole 2. However, hole 2 was

https://www.qsl.net/do2sw/100W%20PA.pdf Arv _._

https://www.qrp-labs.com/images/qcx/assembly_A4-Rev-4f.pdf pages 109/10 Alan On 01/08/2020 20:01, Podolsky A wrote: -- Smell Czech corruptions are

Where can I find info on how to modify my QCX (not the plus) to add CAT control? 73 de Arnie W8DU

The Devil Made me Do It ! I have put a design file for a 7 Mhz Linear HF amp and photos of the final hardware in the Files section of this Group. Search for the PDF . It is a bit off the orig. topic

Hans with all due respect to the superlative CW design I think they will find out about the limitations of the common bias design. Since you buy your Mosfets from a common supplier for quality reasons

Has anyone tried the 50W QCX/QCX+ PA kit http://qrp-labs.com/50wpa biased for Linear Class AB? You'll probably find it pretty good. Someone should try it and measure the IMD3, IMD5 etc... I will,

.urgghr !! I missed that because I knew that the original design was to amplify a unit Diz made for 10m. ! It is a case of not seeing the wood for the trees. BTW if you go and look at the video

Thanks for telling me about Feed2L it looks really good, The idea that the antennas don't have to be the same really got me thinking. I still have a couple of home made antenna relay boxes in my junk

Hi Bob Shipment from the US is according to stock availability and at our discretion, not guaranteed. But yes, if you ordered just the TCXO right now, it would be shipped from US on Monday. 73 Hans

Is the QCX+ TCXO only kit shipping from the US? I need only the TCXO kit, not the QCX+. TNX! Bob WA1EDJ

Maurizio, Check that the 5 volts is correct. It probably will be but just in case. Check voltages on Q6 and Q1-3. RX and TX 73 Alan G4ZFQ

The logical part and the rx are ok. Maurizio

Hi everyone, I ask for your help because after many hours of honored service my qcx 40 has stopped working. I powered the radio with a 16.7 volt 4s lipo battery and suddenly the screen became white

Jim, LOL! Danged Engineers … I had to deal with a raft of you guys during my almost 40 years in Aerospace Defense. The sad reality is that the bulk of Engineers actually believe that they are

Yes, you should get 5V out of the regulator with no load. There are often small (less than 1uF) capacitors on the output of the 7805 regulators, sometimes tantalum. These have a nasty habit of

After a quick check two possible issues. Solder bridge? and missing solder connection.

Great idea!!! Much easier to scan the board than using a loop. You will notice two places that look like splashes. One on the left side and one on the upper right. They both turned out to be fuzz from

Can you post a good closeup of the bottom of the board?

Actually, there is 300 millivolts at the output of the 7805. I am considering cutting the foil at the output of the 7805 to see if its a short causing the problem. The only question is, would I get 5