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Arne, Look at the schematic around T507 on the last page. If the QMX shows a roughly correct power out reading when driving a 50 ohm dummy load, that means that ADC_FWD has a proper voltage on it for

Arne, I know you already checked T507 connections. Your symptoms indicate that most likely your processor is not detecting any reflected power from the SWR bridge, whose main component is T507. This

A variation in the same theme:-

Thanks, I've now tried the dummy load from QRP Labs, and a couple of antennas that should produce absurd SWR at some settings. All the while, the QMX+ shows SWR between 1.00 and about 1.10-1.20.

I don't think Talentcell has any batteries with regulated 12V outputs. But their Li-ion discharge curve gets them near or below 12V quite early in the discharge cycle, and many qmx owners use them.?

Stan, If you can put me on the list for the V2 group buy when it comes around.? I would be interested. KQDTX-Gmail

Stan, if you are looking for eval builders for v2, I'd be happy to help out. I have a number of multi-band plus 6m and 10m antennas so I can test the tuner function on almost all bands. I use the

You are correct Stan. Although I had checked before the connections around L401 it appears that I had been touching the end of the wire with the DMM as resoldering the joint has corrected that issue.

I quick look at the schematic shows why the antenna jack reads as a short at DC. It is normal. 73, Mike KK7ER

Nano VNA as well as SWR tester of my second tranciever shows SWR = 1.1. And QMX shows 1.8.

I have three PA and all of them have input impedance far from 50 Om. SWR fro them varies from 2 to 3. That is why I had to make matching devices for all of them. According to Nano VNA now everything

All's well that ends well! Here's a report on the successful use of the SWR tuning of QMX. 73 Chris https://youtu.be/QHfe-HFDivI

I print the manuals to every radio I own as well as the operating manuals for firmware of QMX and digital modes I use. Ironically, as I type this on the internet, I do not trust the stability of the

Hi Joe, Can you describe what you were doing when it failed? The 12 volt limit is more for the output PA than the buck converters.? If it failed when transmitting, I would look into the BS170s and

Have a look in the Wiki. Specifically /g/QRPLabs/wiki/37128 gl de va3rr

Hi all I have a qmx plus and I ran 13.6 volts into it on a first time power up it worked for abt 5 min then it shut dow. Then i read about the max of 12v vcc. I am assuming that I lost the buck

Sorry for the delayed response, Stan ... I just saw this.? And thanks for the helpful suggestions. I'll look into it further, as SSB sounds like a lot of fun with these radios.

Stan, you said…. The mic element quality has a huge effect on performance; a low quality mic element will have a 'noise floor' (after mic level is set properly) that is very high (without any voice

Do you have another antenna efhw or long wire etc to use as a 2nd test reading? Does the reading change if you plug a dummy load into it instead of an antenna?

Stan, thank you for the great summary. I actually meant to ask about the 2.0 version - which you answered. I’d like to be added to the future 2.0 build kit ? ? ?RoyAshkenaz - gmail I will be