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

Timothy, I was not questioning the tech stuff. Just the wrong prefix. kHz is a bit different to MHz. On 01/08/2020 11:10, Timothy Fidler wrote:

All QCX firmware revisions are compatible with all PCB revisions of both QCX and QCX+. However in the case of CAT command support, a physical CAT serial port is required. This port is included as

Search this page as the current firmware will support it, but a few changes are required to the board.

The QCX version distributed before the QCX+ had the CAT commands built in and were presented in the manual. Check your manual. If you don't have it, you can get a software update from Hans. Jack,

Pin 2 of the display is about 300 millivolts.

Thanks for the quick reply. I don't think it can be in backwards because the heat sync plate is facing to the rear and connects to the rear plate of the cabinet. When I measure from 5 volts to ground,

Is there a way to add CAT access to the original QCX (not the plus)? tnx de Arnie W8DU

What is the voltage on Pin 2 of the display

Hopefully I answered my own question. Maybe I should read the manual a little better..... So on the modifications page, JP15 & JP16 are the +12v and the ground. Basically I should run the ground

Jim If you measure 13.8 on the actual regulator input wire and 0 volts on the actual ground wire and output wire then it would look like a faulty regulator. 73 Alan G4ZFQ