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Hello Peter, thank you for your message. The BS170 power amplifier transistors are only loaded with approx. 3 watts. I also do not tune constantly while transmitting, but only at the beginning. The

Axel.? No need to apologize for the enclosure - I also use such boxes - especially for units mounted outdoors.? If used carefully, they can be surprisingly waterproof.? My only worry is that

Hi Windows 10 is a complete git, your PC has the correct drivers. Go to device manager, click show hidden devices and delete all the non connect devices, restart windows with QDX plugged in and

Hi Nigel, tnx for your reaction. Those QR codes ... long story ... it all started here https://reflector.sota.org.uk/t/best-comeback-for-are-you-fishing-part-1/26135 So the codes refer to a page on my

My QCX+ is ready for use. *Attention all enclosure fetishists:* Do not look at the pictures! The QCX+, the 50W PA, an automatic antenna tuner, + Lipo battery in one box. The polypropylene box cost

Dear Dave, thank you very much for your reply, it works ! i did what you said? and the magic happened. The only issue? left, is? although the GPS locks? when i run? the program? and? transmit

Hi Daniel I would suggest? you run the U4B transmit program first for 30 minutes info in the manual? and then do the hardware test ... I would also suggest you put a 50 ohm resistor over the hf

Thanks Hans - all your hard work is much appreciated. Beyond excited that mine has shipped ( #72754) !

Hi Larry, Please review the following video.? It is for the QCX+, not the QMX.? The principle applies.? You what to try adjusting the LPF inductors to see if you can optimize the power out:

Thanks Dan and Colin, A lot of the experience for those of us who are building these rigs is learning and understanding them. Nice to have a group to work through the process. 73, George, n9dxp

Jack, arrow buttons to move between parameters, then delete or back space to erase, the type in correct value, then arrow buttons to next parameter. You have the BPFs and biases correct. -- 73, Dan?

George, I have no idea as to why Battery Monitor makes a difference either. But I've been there with unexpected s/w glitches. -- 73, Dan? NM3A

I am guessing that there is an interrupt that is not being serviced in a timely manner but having never seen the code, I can only guess. -- Colin - K6JTH http://tangokeys.com

I built my QMX for 9 volts. After the L401 jumper mod I kept the original number of turns and spread them out as much as possible. The receive has improved but the transmit power is well below what

Thanks Dan. Just wondering why having the battery monitor on or off makes a difference. Thanks, George, n9dxp

Very good Mike, that helps a lot. This is my first QRP Labs radio so I was a bit lost. George, n9dxp

Just a quick Q w/ KE8MOA on gud ol' forty. QDX running ten milliwatts ( as usual for 40m ) to the end-fed wire. Tnx QSO ! 72. Bill, N4QA

Ops, sorry Bob. I'm watching too many threads. 73, Cliff, AE5ZA

I've been following the discussions about improving the QMX receive sensitivity, and I have no problem admitting it's way beyond my comfort level. My QMX is built, but I haven't put power to it yet. I

Not the problem as both Cliff and myself have the bias set at 30...