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Thanks Nate! Well, this looks promising. I was also considering just building a 20-meter amp and being happy with external filter for 30 and 40 meters, but of course a little extra on the higher bands

Not installing the BPFs/LPFs shouldn't cause a problem.? You should disable TX for those bands in the band config menu, otherwise it is risky.? Accidental TX when the band is selected or running any

I just spent hours at trying to get airspy working it will not connect. Don't worry I do not expect anyone to try to explain it online. :)? It was just a curiosity thing if it would work.? Just

Sam, I think others have found that without changing ferrite materials, output above 17m is pretty poor, if it works at all. If you look up some threads about 10m builds of this amp, the changes are

A bit complicated to set up at first, but then just plug-n-play.

Hi all, I have an unbuilt 50-watt amp kit and I'm trying to figure out how to best build it. I just completed a 5-band (40-15 meters) homebrew rig (it's not a QMX, but it works!). I'd like to use the

That sounds interesting for when using at home, but complicated.

N9LFF The QMX plus is clearly a mature design for cw and digital modes. I delayed until I had time to build it, on my bench now. Best to not be in a hurry during assembly. If you are ready to build,

Oh Stan,? you embarrass me.

Hi Ludwig and Stan, I'd definitely check BS170 as well. Once removed from the PCB, IC503's Vcc to gnd seems to be open, so if it was causing short, it would have to be done via BS170 I guess? I'd

I think that's possible too. After several hours experimenting with band configuration settings and calibration settings, my QMX+ suddenly started screaming in my ear on one band and developed a

I think we have already gotten this year's big new thing from QRP Labs, in the form of the SSB update. To speculate on the new thing for 2026... perhaps a QMX XL? Something with a larger display and

Just had my first QSO.? A local ham.? Received a good audio report.? I was using the QMX+ and my "Tiny Linear".? The Tiny Linear is a 100W-capable homebrew unit.? It is in a box only slightly

Thank you for your responses and yes that makes sense. I wasn't thinking about how mosfets behave when overheated. I checked all the solder joints and ohmed out Q8 - Q11, T1 and L14 to see they had

The output of the IC101 is 0V before pressing the button, then briefly goes to 3.2V, and then to 1.7V when I press it. When you press the button input starts at 12 then goes down to 10 then 8. +V,

Good catch, Ludwig. I guess I was writing when you posted. You are always more careful than I am in diagnosing things. Han, you should order some BS170, too, if you don't already have some, and Ludwig

Hi Stan, sure. It's a charger (sorry I forgot the word "charger" in the original post), not a power bank. The specs on the bottom are: SWITCHING ADAPTER PN: A2935 Model ASGaN83w-P40W20 Input

Excellent!? So glad that it is working without other damage. And I understand completely the drag it is when you wanted to have fun in WPX.? I have been stymied for other (non-QMX) reasons. FYI, I

There is a current limit for the VCC rail. Duty max is doing this. So I don't believe the high current was flowing from VCC via IC503 to GND. Maybe something is wrong around the BS170. I see two

Han, can you share with us the exact model of Anker 36W power bank you have?? I don't see one labeled that way on their website.? Several of Anker's power banks do not support 12V PD (since it is