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This morning based upon Evans response suggesting that the LPF of the QCX+ being sensitive to load reactance, I decided to tinker with the LPF in the QCX+. I started adjusting the spacing on L1 to

Hello Trevor This means you didn't do the factory reset correctly. When you do a factory reset properly, the radio will reboot by itself (no need to back out of menus), then it will ask you which

Ahh, interesting, thanks! Looking at the assembly manual, it mentions that pin goes high at TX... looks like one would have to create a switching circuit to trigger a PA off of it....something to

Morning Paul In the northern Willamette Valley, “Tigard Oregon” about 7:00 pm local time nightly on 28.130 there is a CW net hosted by AB1LL “Bill” that is open to all, he suggests that you

Hi Jonas, The temp comment I made was just an observation.? The 3w attenuator resistors and the center toroid of the lpf get pretty warm but as I test im well over the duty cycle of normal use, so

Hi Alan, I'm not sure, but i'd guess something like 0-70 degrees C or similar. I've had it for 15 years and cost next to nothing. A quick search show this as a current alternative if your're in

I will be doing another CW on the air practice session Thursday 01/02/25 . Anyone is welcome. This practice is intended for operators who are new to CW or they need some practice. IT DOES NOT MATTER

Jonas, Interesting, what temperature range does it indicate? 73 Alan G4ZFQ

Thanks Nick! It was indeed satisfying. Even though receive still does not work, it is a bit less likely to be an IC problem as I previously suspected. I will take the info i have been given and review

Hi Roland, The fact that the R7/R13 junction does not change indicates that either Q4 or Q6 have failed.? Trying to piece together prior posts, I think that Q4 is shorted.? I suggest you redo the

Hans, Hope you and the LFB get well soon! There's a lot of pneumonia going around here too, so take care. Hope you have a happy and prosperous new year. -- 73, Dan - W2DLC

Congratulations Joel, that must have been extremely satisfying after the previous frustrations. We’re all learning, I trained as a Transmitter engineer on high power broadcast transmitters, but that

Hi U4B works on 2m https://qrp-labs.com/u4b.html :) 73 DE muhsin TA1MHS

Thank you Hans for your comprehensive reply. I dabble in hardware and software (and don't have children) and can't imagine what it must be like to try to run a business, family and develop very

Hi Bryan, You say "the insides gets warmer overall than the heat sink", have you measured the temperatures of various components when the amp starts to act up? I use a cheap IR thermometer that is

Hello.? I just assembled 2 QDX-Ms.? If you download the assembly manual,? there is a chart that plots input voltage vs power output to answer your question across the spectrum of power inputs.?

The u3s can do ptt via the key pin, see the operating manual. -- The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.

Hi all Thanks, all is OK here. I'm fine. Some seasonal distractions. And the LFB (youngest junior lab tech, age 4) has pneumonia which is not much fun, but he is recovering fine. I got a cold now

hello Evan, here the results: R7/R13 junction is 14.19 V in RX and TX L9 right side (next to Q6) is 1.01 V in RX and TX left side is 1.05 V in RX and TX Your question abt L10: it is the original

Very true Ludwig. Thanks for the link. Sweeps are still definitely not my strong point but one things for sure, after checking the board several times, I still found a solder flake. Thanks very much