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?Yoon, Thank you for your reply. I had some time to waste yesterday (my XYL was driving) and I found the key on sale at eBay and Amazon, between $22 and $28 USD depending on the little accessories.

Daniel, that's fine. Please check the schematics for IC407. Pin numbers 1 to 14 are going at the left side top down und 15 to 28 at the right side bottom-up. Pins 7, 8 and 10 to 13 are all connected

Hi, Cleaned with flux/solder braid but still a short between pin 7+8, and another crossing 10-13 remain. I imagine this was damaged when the chip was removed and scratched the board. However, and do

I’m more than happy to fix this. ?I get rigs from all over the world to bring back to life. ?Tariffs and expensive postage is a pain. ?But at least it’s an option. Also, I’ll be at

This can be fixed. ?The missing pad is no problem. ? Pin 21 has no connection. Clean with flux and solder braid carefully. ?Inspect everything else under magnification and solder in a new pcm1804.

15M is BPF0 17/20M is BPF1 30M is BPF2 60/40M is BPF3 It's shown on page 78 of the 1_00_026 operations manual 72 de va3rr

I neglected to check enable lines while my radio was open. Does anyone happen to know which bands correspond to which IC402 inputs? I know that 15/17/20 go to 0 or 1, and 30/40/60 go to 2 or 3. But in

Stan, Thank you for taking the time to explain how to troubleshoot my speaker issue.? Following your instructions, I sampled pin(3) and pin(5) of the LM386 with my scope.? I don't have much

Good point

Stan, Absolutely you can eliminate 6 m and put 20 m (or 15 m) by itself. I was more thinking Hans could add one more LPF space so you wouldn't have to eliminate a band. There certainly is PCB real

Hi Yoon, I really like your design! It always makes me feel nervous to see a long antenna attached directly to the rig (imagining the stress on the circuit board). The boot and hat arrangement could

T501 can be left as is, but I don't think we can use the primary center tap when going for CMCD. Need two L502's to power the two sets of BS170 drains. From

Hello Daniel, cleaning the existent pads using flux and desolder braid should be easy. Than check if the yellow capacitors are well connected, solder if not. (C431 looks like desolderd.) The ripped

Got the unit of someone who attempted to replace IC407 on their own. The board isn’t looking great. Just wanted the opinions of potential repair people better than myself the unit still turns on

Matti, Very unfortunate problems you are having. The voltages you measured with the button pressed show that you have something shorting in your QMX+, on both the Vcc and Vdd lines.? It is not easy

That is another great idea. Mark

Ill have to look into that. Thanks

Could take the QMX+, redesign T501 and the LPF"s for CMCD with the tank placed out beyond T501. It's preferable to have the tank right across the BS170 drains so T501 only needs to deal with the

Back to the original topic, I was also imagining something similar, docking like the attached sketch - though it is not a 3d printed case but an aluminum enclosure. It is still only imagination, as I

I wholeheartedly agree.? I've designed three PCBs for antennas (two baluns and a T-match tuner) in kicad in the last few months.? Building and troubleshooting my QMX has brought me closer to buying