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Hi all Since T37-6 (yellow) toroids suddenly got scarce, some new batches of QDX 80-20m, QMX 60-15m and QMX+ are now being supplied with some T37-10 (shiny black) toroids. I have updated the QDX, QMX

I suspect ESD or power supply damage to an incomplete board would not be repeated once fully built.? ESD damage, to ICs in particular, is often evident only after a few weeks or months...

Yes, that's the sort of thing I was thinking of, not surprised you have already tried it.. I understand that it's a lot of work to make but if 1 in 7 of the QMX kits fail because of the PCM1804

Just in case anyone else gets the same symptoms:- I built a v2 PCB QMX+ and all went well until i went to transmit into a dummy load and the swr protection activated and a high swr was indicated via

Joel, I had a similar incident on a QRP Labs built QMX+. It had lower power output from the factory (3 watts or so which is within spec) and then it had no power output. I checked T501 and it

Hi all. I have completed the build of a V2 QMX+ over the festive period, and the? radio? is working very well indeed.? I did have some issues however and wonder if the excellent assembly

Hi Jerry No, it doesn't; counterfeit parts is only one option; there could also be ESD problems causing it, either during assembly, or subsequent handling somewhere along the line; or there could be

Chris, I am not sure I am reading the chart correctly, but it looks like there is a significant power output difference for the different bands. ?The line color for band is not in the picture. Did

Ron, Thanks I’ll go that one, I appreciate the help. Rick KC6UXI

Hello Chris, hello Ludwig! Wow I've got some interesting news this evening. Those voltages that I said weren't present yesterday, are present today. I can't explain it but I set the radio up on the

I bought a 6 meter transverter from him last year. I tried it with a?QCX with usdx conversion with 10 m filtering and power reduced to 300 mw. Made 6 contacts on FT8?and then the band went dead

Jeff Moore has never seen a PCM1804 fail after he’s replaced it and he replaces quite a few of them. Jeff is sourcing replacement devices from Digikey and they’re also available directly from

Evan I did not really figure out why the peak voltage gets worse at lower frequencies.? In general these peak voltages are caused by the harmonics reflected back into PA transistors by the LPF.? It

If boards with a failed PCM1804 never fail when the part is replaced, that points to counterfeit parts.? And I'd not have them stuffed at that assembly house, make it?a hand add at QRP Labs

Dear Stan, please put me on the 2nd list, if you descide to have one. Best regards, Stefan

Please include me in the next group buy (if it materializes). Thanks for the effort on this. Paul - K9MR

Good job, Ed. From coastal TX I saw RBN spots but none reaching this far south.? Hopefully theunsettled Geo will settle by 1/3/25.?? CharlesK5KXJ

I have a Ten-Tec 1210 transverter that should work just fine with a high-band QMX. W1GHZ had designed a simple 2 metre transverter for the Flex-1500 that could probably be reworked by someone handy

I like my Hardrock 50 and there is/was a low-power driver amp option.? If no longer available it would not be too difficult to integrate a similar driver. 73, Don N2VGU

Dave, W2KV and I installed a 10 watt 2M transverter inside of a Uniden President HR2510 radio back in the '90s.? Maintained both 10M and 2M operation. Should be a piece of cake in the QMX+. 73, Don