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although I think I'm an experienced builder it may be that I'm missing something. Having gone through all the checks and replaced or re-did components as recommended I still have no image frequency

Robert, For board cleaning I am using Isopropyl alcohol brushing the board with a tooth brush. The solder I use is Kester no clean 63/37 and the flux can be easily removed. No harm done to the board

A switcher at 95% efficiency would waste 12W x 0.05=0.6W vs 1.8W with diodes.? So 1/3 the loss. 73, Don N2VGU

Fix the problem at the source, get rid of that no-clean fluxed solder and get a roll of 63/37 with RMA flux from Kester or Multicore and clean it off with ordinary isopropanol and a cut-down acid

Hello since a few days I have a QMX+. All is fine and I love this addition to my QMX(80-20). From time to time I am notice a black line moving from left to right beyond the frequency display. Morse

Hello Yoon, yes you are correct with your assumption.Its planed a HT like the KH1 with battery, speaker and perhabs automatic tuner inside. On the other side,since the last weeks, i'm trying a

And if you have a 1:1 SWR match to your vertical, what are you using the tuner for? With the setup I described, I use 20 feet of coax, so that's my approx distance from me to the antenna. -- 73 de Roy

I had run into a similar situation. And this solved it: Amazon.com: Digirig Shielded Short USB-A to USB-C Cable with Ferrites : Electronics I so use this:

If you use a linear regulator, then you're correct-- It generates heat and will "waste" power... The buck/boost regulators are all switchers, which will (nominally) waste /less/ power. Consider, if

Hi All It is very interesting to see so many recommendations for IPA etc. I have tried this on a kit I built and it attacked the green coating on the rear of the board. John G0UBE

The only reason I can think of for doing this, if I were to do it, is to turn the QMX into an HT. What's your plan? 73, Yoon KM6KJI

I scavenged a 30pF from my QMX+ kit to get me through this QDX build until I can get a replacement. I may contact Hans and have him add this to a GPS order... 73, Steve AK0M

I clear thick areas of flux build up with a careful and gentle scraping with the back edge of the pointy end of a #11 Xacto blade.? Then a very used, old soft toothbrush to brush way the flux crumbs.

I am just finally getting around to assembling my QDX rev 4 to take with me on a KL7 visit this week. Discovered I am missing one of the 30pF capacitors. I have a plain ceramic 50V 30pF that I could

I've been using no clean flux on my QMX+ and using 91% isopropyl UNSUCCESSFULLY. A friend recommended a product called "flux off" but it costs $30 a can (too much for me). I don't remember my old

Perfect. No perf board required.

You're welcome ... and here is a photo showing how I built it.

I have gotten -26 reports on ft8 and still completed the QSO on my QMX+ 73 -Mike

This looks like a great method and eliminates the box I was working on to go between the KX3 (ACC2) and the amp. ?Thank you! ?I knew there was a brain-trust out there.

I added this mod inside my 50W amp to add low-active PTT capability without disturbing the existing high-active PTT.? Then I wired up a PTT cable that connected the KX2's PTT signal to the tip of the