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The wiki page QMX QMX_plus Debugging ( /g/QRPLabs/wiki/39617/222894 ) has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions (

Thank you Jerry! I've managed to add proper capacitor at the input of PA (parallel to the secondary winding of the input transformer) and reduce the SWR from 1.9 to 1.1-1.3. It is for 20 m and 15 m

Good conversation. All I would add is that the 'charge to 3.85V' approach is fine short term if they get fully charged every few uses /? few times a year. Reason is that increasingly lithium

Likewise for a US group buy. Thanks? Dean N2TNN

I just finished my QMX+ and thought I would share my RF power out readings. I did my best to wind all the torroids evenly though not perfect. Measurements are made with an Oak Hills QRP meter into 50

Probably same thing happened to me. I didn't hear any strange sounds but once I disconnected battery and tried to boot it again, the unit is completely blacked out. Makes just "pop" sound on the

Please count me in for the group buy M0MZB in UK

Please include me as well in the US group buy. Thanks. Bill AD6JV

Starting a new thread. Scouring the web, here's mention by KG7AGO of using a GaN-FET similar to the INN650D240A getting 300 W on 20 meters with a 60v supply. https://www.qrz.com/db/KJ7AGO

I'm fully aware what the convention around C for charging rate means. Have been dealing with it for years. But the anal engineer in me is bothered that it isn't stated in the form of? "0.4C/hr".

OK - lets just suppose (until proven otherwise) that the backlight wasn't on.? Because if it was on, somehow you were getting voltage on the 5V VCC output without the processor running its firmware,

I don't think there are a set of values that will work for every build.? I tried Ellis's, and they didn't work for me, but tried several other settings and finally it worked.? Then I changed back to

Highly unlikely.? I have run calibration several times on my four different QMX* devices, always with a battery supply that can deliver a few amps (no current limit) - and have never had a problem.

Gerry, C is the capacity of the battery a decimal fraction of that is an acceptable charge rate.? ?IT measn you need to know the capacity and the acceptable chrage rate for it.? Don't beat me up

1) I have found that the low level sound card output to wsjt-x works fine.? But if you want to increase it, you can use the audio level adjustment per band in the Band Configuration.? See the

On Tue, Apr 8, 2025 at 04:09 PM, Rey Machado wrote: > > @ZL1REY Count me in for the ZL group buy

I have started using fw 1.02.000 to do some FT8 via WSJTx. Works but:? 1) sound card out to WSJTx input is a bit low, reads in the 20 to 30 range (on WSJTx) when normal range is about 40 to 60 and

Realistically, I'm hoping they could do a couple hundred Watts out at up to 14 mhz. It's a very small package. Hard to dissipate switching losses. Jerry, KE7ER

Many if not all cell phones have an ESD shunting inductor right across their antenna input, either a choke or incorporated as a tuning element. All of the properly-designed tube amps I've run across

In the Terminal program.... Audio gain for each band configuration. "Audio gain (dB): 54 is the default. Valid values for the parameter are 0 to 99. This makes it easy to choose a gain by band - which