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As Jason pointed out, L503 needs to be replaced. ?I always add an SMD protection diode across Q508. ?Much neater and easier. I also see a few questionable solder joints where you can see the copper

15m CW - other bands are similar but with lower volume on the 600-750Hz tone range 15m Digi showing 4 tones at 700, 1400, 2100, 2800Hz. Can anyone suggest what I can do to get rid of the wideband

Hello Ludwig and Randy, QMX+ rev 1: Q507 and the BS170's are replaced. Q507 and one BS170 was broken. Still the same problem: No output. Now I have an oscilloscope so I can proceed with the tests

Hello Anders

The bottom diode, smd one, looks as though you have broken off the pad that your larger diode is connected to. This diode is no longer making a connection and likely needs to

Great, thanks!

No issues with this, Bruce.? I can see that the wire is still intact.? The broken top doesn't affect the performance.

Hi everyone, I have fixed this issue! It ended up being an incomplete solder connection at t501. I added some solder to the top of the board at this transformer and I have my on-screen s-meter, swr,

Hello QRPers, I'm having an issue with a new midband QMX (which is likely my fault!). I have no output power showing in my diagnostic screen after doing some testing with a a 20W QRPlabs dummy load.

Hi Bruce, This is a fairly common issue. I've had a few kits arrive with exactly the same damage. If the wires are intact and connected to the board, it should be OK. - Bill? W3WJ

Curt, Thanks. No, there’s no continuity. Mike

Bruce, It's a fix described on the QMX page right below the Documentation header.? Here's a link directly to it https://qrp-labs.com/qmx/qmxrev2 It's been a while since I posted this, so the fix may

I just received my QMX+.? The shipping box and materials all arrived in good condition.? This appears the part was damaged either before installed or before the boards were sent to QRPLABS. Will

Gentlemen, please add me to the list for a future group buy.? ? E-mail: kb9hv@...

As a positive conclusion I have found that VarAC with its 500Hz bandwidth paired with the QMX and QCX 50W amp running at 13.8V (amp) gives a good 10W out on this digital mode.? Was able to

Another D109 failure here. I think. :-( I have a QMX+ Rev2 that has been working for over a month. (SMPSs integrated into main circuit board) Today I turned on CW practice mode for the first

http://qrpschool.com/building/ocx-3d-printed-case-by-w4mhz/

Andy, Not the BAMAtech case, but W4MHZ has a 3D printed case design for the original QCX.? He posted recently that he could revive the design and print more cases if needed by anyone.? If you don't

Oh man!? Once again I am SO DUMB!!!? You are right!!!! My PS was set to 250ma max.? I punched it up to 2 Amps and the issue is GONE!!!!!!! Thank you !!!!!!!!!!!!!!

I think this is not so typical. It would mean * IC403 is broken or * IC204 is (half) dead or * IC406 is broken (low probability). For a broken IC403 I had expected the voltage at pin 7 and / or pin