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The only reference to 26 pins in the QCX manual is on page 14 where it says ... "I recommend soldering one pin at each diagonal, for example pins 1 and 15.

Hi Charles... I'm afraid,? no new? PCB? .. looks like the parts print does not match the layout..???? seems to be reverted by 180 degree for me...??? really hope, that this is a unique

You have some rework ahead of you... The silkscreen appears to be wrong. It might be hard to complete with the silkscreen rotated 180 degrees.. A real challenge! This might be time for a new

Hi Bret The silkscreen has been printed incorrectly on that PCB. The silkscreen is 180-degrees rotated wrongly... wow. I have never seen that before! You could probably build the kit by ignoring the

Here's a picture?of my PCB sitting on p12 of V1.08 manual. Yes, just must be a typo with "26-pin" as I count 28 in the p12 photo. https://i.imgur.com/t0Fqi4E.jpg

The dimple on the socket should be aligned with the dimple on the silk screen, IE nearest the BNC contact. Look at the picture in the manual it is very clear. Jan

Sounds like you have the PCB upside down but your description suggests that you haven't, any chance of a picture? The manual refers to soldering in 2 pins of IC2 to check it is seated correctly then

Dear all, Today I did my first tests with the GPS on WSPR mode on 40 m. As it had been said elsewhere on this reflector, you absolutely need to set menu 4.7 Practice to On, and to have your QCX on a

What if you put the rig into practice mode? It almost sounds like the key connector shorted somehow. W2MW - Kurt

Check the paddle 3.5mm socket, solder bridges or something like that ? The 4-pin header for GPS is in parallell with the socket as well. If it measures low resistance to ground while powered off

well i seem to have broken my QCX. things i Know in cw mode TX continuously in either VFO with no key plugged in WSPR beacon works OK Menu works OK sidetone always on. can put in practice mode

The PCB I got with my QCX 40m kit doesn't look like that pictured in the Rev 1.08 PDF instructions.I only noticed the difference *after* I soldered?in the 28-pin IC2 socket. The PCB has "CW tcvr?QRP

AFAIK, these single transistor amplifiers (class C, E) have a non symmetric output, looking more like half wave recitified AC even when driven with a square wave, thus contains large even harmonics.

good thoughts. Thanks

Sorry to hear you're still having troubles. If you pull the finals (remove them) you should be able to troubleshoot the board easier. From what I can tell, having them out of circuit won't harm

I learned recently prepping for the Extra Class exam a sawtooth wave is composed of the fundamental and all harmonics; square waves are going to be predominately made up of odd harmonics as Bob

Try the Factory reset, Mike.? Menu item 7.8 as described on page 96 of the A4 version of the QCX manual. 73, Bob? ZL1RS

Hi Mike, Menu 7.8 general reset, then start again as if it was a new QCX. Regards? Georges F6DFZ

Group, ?I chose the wrong band at the first start up (chose 80m instead of 40m) is there a way to clear it and start over? Thank you! Mike WA3O

Some measurements j ust for information ( as mea sured on 14 MHz with a HP 8592B spec an). The QRP-Labs Si5351 a synth board 'raw output' contains the fundamental and fairly strong odd harm o nics