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Its safer to use 7805 on dc input jack and not trying your luck.

Interesting.? It looks like the processor is having a hard time controlling the 5V power supply.? It shows that it is using close to the 'max' duty cycle, which would be to increase its voltage, but

I am trying out my QMX mid-band that I built. It is connected to known working coax, to the QRP Labs dummy load I built last night. SWR is 1.4-1.5. Main issue: I can hear my key’s sidetone but

Someone Please Help ME! The QMX Mid Band model I assembled on Saturday also cannot resolve the loud RX noise. I was able to receive the CW signal sent by placing the QCX-mini next to it. I was happy

Hi Jerry, this makes sense. I will try to double check if the length is compatible with the three toroids and if they are okay I will use the smaller one for the coils you listed. Thanks. Giuseppe

Ok so as I'm a beginner as was misusing WSJT-X big time apparently, that's why I was convinced my transmissions didn't worked.. Now it looks like it's working as I made some contact. But still the 5V

That sounds like a solution! Kapton tape works for me for clamping pressure when testing without a case lid.

I had couple of field days - 4 hour long in ft8 mode and with those voltage drops. No spms or mosfet issues. My general complain about my own solution was that although ATU tunes the antenna - it does

Hi Sardar, Yes agreed, unless the sidetone is turned up loud. Also in received mode, if the ATU is still powered and not RESET the relays will be in the last state. 73, Dave

I do not think lm386n should exhibit high volume in TX mode. -- 73, Sardar (AC8L, 4K6SA, VA3DUA).

Dave, I did an empirical test of a continuous load by keeping Qmx+ in swr tune mode and playing with a non-resonant whip length to keep ATU confused. Then I repeated the same with 4.6w, key pressed. I

I have used Talentcell 3000 mAh packs on both QMX and QMX+ for over a year with good results. They come from Amazon and include a charger and cable..$23. Fully charged they provide 12.2 volts. Mike

Greg, this looks now just like a decently strong LB QDX, I don't think there's anything to worry about, especially if you don't plan to use 60m. Enjoy! -Nate N8BTR

Good ideas Ludwig and Stan, I'll try adjusting the values in the 22k - 22k voltage divider that generates the ADC_5V output.? Perhaps provide some drive from the PWM_5V signal, then the ADC_5V signal

Hi Sardar, Cal, I might be wrong, but my understanding is that the VCC (5V) used on the Companion board and ATU is sourced from the SMPS on the QMX+ main board. From the G6K-2F-Y datasheet for the 5V

I got the C542/68pf cap from a UK seller on ebay so it's hopefully here within a week or two. Toroid winding is the next step :-)

I have come to dislike the tiny wall warts as they contain switching supplies that are noisy. The heavy transformer based ones are very quiet but I find that they are often very unregulated and many

I suppose the ideal might be to use exactly the right iron on each joint, but hardly seems worth the trouble. It is a good idea to have two irons if you happen to have two hands, makes it easy to

Sorry, it being the QMX+ enclosure and gps. -- Phill EA5JHA

Hmmm, no excuses! Scope set to x10 and it looks like I've managed to switch the probe to x1 before testing. Thank you both so much for the help, greatly appreciated. Still no output so moving on to