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https://www.allaboutcircuits.com/technical-articles/introduction-to-the-feed-forward-linearization-of-rf-power-amplifiers/?user_mcid=3b7c12b4be

https://youtu.be/fImxAz-MeQ4

Hello, I recently just fished putting my QMX Rev 4 kit together with the windings necessary for 12v input. As I was going along I verified I all continuity checks as instructed and verified no pads

I tested the quality of the SSB transmission today. A standard electret microphone with a mic gain of 55 and a compressor of 3-5 and at the end. The receiver was an FT-817. 73

Hi Norm > I know about the wattage differences compared with S-meter readings, etc., The probability is certainly non-zero. But I don't have any concrete plans for a 10W QMX+ at the moment. Bear in

I don't know if any of you has noticed anything similar: while performing the SSB calibration on a band-by-band basis (using the "O" option) I noticed that at the end of the USB/LSB IMD Optimization

I know about the wattage differences compared with S-meter readings, etc., but... is there any chance the QMX+ will have a full 10W output like the QSX was spec'd to have? -- 73, Norm/KC1BMD

Probably a waste of paper either way. Most of us have a laptop or small desktop that can sit on the workbench, better than paper in that you can quickly search for a specific part. I'd just print out

Hi Mel For now, tweaking the band configuration parameters slightly to make it work, is perfectly fine. ?t won't damage anything else and if it allows a good calibration, go for it. The bigger

On 3/28/25 I had a CW practice / rag chew session on 20 meters. I worked three stations. I even worked some DX: Date / Time Call Bnd Frequency Mode Power Rec Snt Name SPC# Comments Off 3/28/2025

Hi all, Next monday, *March 31* is the next *QCX Challenge* , on the regular bands. Times are 1300Z, 1900Z and 0300Z (Tuesday). Time to get on the air with your *QCX, QDX or QMX* rigs! Use any

Hi Stan, Should we be adjusting band parameters just so that we can get a complete configuration run? If we cant get a complete configuration run, does that not signify that something is not quite

Mel, I don't know, but I'm wondering if there is a relationship. -- 73, Dan - W2DLC

I think it will be different for each QMX.? It may be associated with LPF parasitic issues or whatever.? I have no real clue why/how these settings affect the calibration. But please everyone, read

Hi Dan, Should we be adjust band parameter just so that we can get a complete configuration run? Because we cant get a complete configuration run, does that not signify that something is not quite

I could only get calibration on 80m to get beyond ~20% by using all the configuration parameters from the 40m band configuration for the 80m band, both frequencies and LPF.? Still required a lot of

I would expect they would look the same, I'm just wondering if the predistortion curve is related to the peak amplitudes permitted by the LPFs. Maybe moving the band edges and centers to center on the

I had a quick look at the 20M LPF curve and it looked the same. I didn't examine it carefully though. Ellis

I'm wondering if there is a correlation between the band edges and centers settings improving the curves and the actual LPF peaks. -- 73, Dan - W2DLC

Hi Jeff, I was afraid of that. While I do have an o-scope and could take readings, it would be an exercise in futility for me. Should the issue turn out to be one of those sub-microscopic components