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I’ve tried to power the mic externally, I didn’t know the QMX already provides bias voltage fir that. I will probably try to replace the stm32, if I can source one.

Appy 3.3V to the mic input?? Why????? The KEY? lines (dit/dah) they would not like DC applied to them as they are input direct to the micro.? ? Fo r SSB I think one is hooked to the A/D which is

Is Hans going to Dayton Hamvention this year? How about a troubleshooting class for the QMX and QMX+ product line? Some discussion to common problems and resolutions to the problems. It would be great

Hi Stan, thank you so much for your help, after the QMX died , first I thought I damaged the SMPS boards. I replaced them with the good working boards , but didn’t work. I started to thinking that

...and of course I got the wrong video link. (though that one is interesting, it's an earlier iteration) *Here's* the one I'd meant to post: https://www.youtube.com/watch?v=tqWAJBCBj9c

I came across this video elsewhere - hadn't seen it posted here and thought you might enjoy it. https://www.youtube.com/watch?v=P5jCYnwQscQ Looks like a custom bracket to hold the components

Allison, How about if I keep the amplifier on but remove the PTT cable.? The amp is on now, but not transmitting, and it's drawing 0.00 Amps. Jim K8DDV

First, a reminder to all:? Please DON'T CONNECT ANY EXTERNAL VOLTAGE TO THE QMX/QMX+ MIC/PADDLE INPUT. For electret mics, QMX/QMX+ already has an internal 3.3V bias voltage hooked up to the mic input

Without DC power you have no bias? for the diode switching so its high loss for RX and tx. -- Allison ------------------ Post online only, direct email will go to a bit bucket.

I've purchased the 50-watt amplifier kit, to be built for 80m, and bought assembled the 40m and 20m amps from Ray, VA7SK (very nice solder job, btw); on 40m it certainly makes a noticeable difference

With those settings turned on, you will be getting about 20dB lower of a signal from your mic to the audio path (compared to when the setting is turned off) - so it may be reacting with other

Yes, checked 80m also and it looks the same. I’ll have to look at phase predistortion, it is currently whatever default is, on I assume? 73, Robert, WA2T

Hi Jim, L501 or C504 failure can cause these symptoms. ?Make sure to have about 2 ohms continuity on l501 at the pcb pads. ?It’s a little difficult to test C504 in circuit. ?These big

Too bad - I was hoping that L504 or L514 was broken, since they are so easy to replace. To test L501, the 330uH choke, I would first test it for proper continuity through the circuit card by probing

I noticed when I have EQ turned on, that I get choppy audio.? This happens when "Use EQ" is set to yes.? It persists while I am using the terminal or when I am out of the terminal or even when usb

Jerry, When I look at the uBitx LPF, its structure is the same as that of a "shunt first" input Chebyshev LPF.? Does that mean it shunts the high frequencies to ground instead of a "series first"

Hans, I'll do it and post the updated PDF. Now, please, go on your holiday! ? Dave WI6R [email protected]> wrote: -- *https://www.qrz.com/db/WI6R*

Adam, I would not do that as the low-pass filter is designed to attenuate the harmonics of 20-meters so the second and third harmonics of 40-meters will exceed regulatory requirements. Gary W9TD

Hello, I uploaded the charts of the simulation to https://github.com/dl4pj/qmxfiltersim The simulation now creates all charts at once and is easily customizable. Now I can start with my experiments

I'm one of those people posting about 20.? I re-ran all three calibrations for 20 one at a time and have been able to make QSOs I'm also having issues with sensitivity on 12 m and 10 m.? I didn't