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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

Hi Don, I will try with hot glue(as Ivica suggested), it seems somewhat the best compromise for having the toroids not bending (I don't anticipate any extreme abuse) and if needed I could still think

Quick questions for those in the know . . . QDX Rev 4 - 9V build, 9V power supply. Can the 5V power supply/rail safely sink another 31ma? I think there's room in the QDX for a small, DC 5V, 25mm

Thanks for the follow-up Nate. I believe I agree with you about the QRPGuys meter - especially on 30M AND 60m. I reran TX tests today with my Elecraft DL1 dummy load and measured via DMM using: -- a

Don't forget to document the part shortage, so that you do not forget later and wonder why 160 meters doesn't work...... 73, Don N2VGU

It is likely that to obtain optimum results you may need to use a different tip, temperature or both for the grounded end of some components.? I do rework/prototyping for my clients and I will often

The only tougher colors to match are shades of white, metallics are a nightmare as well. (Former body/paint shop worker). Brady make P-Touch tapes in white-on-clear, which looks surprisingly good when

PROGRESS! FB GREG KI4NVX

Looking good. I started and finished building my QMX+ yesterday. The torroid winding is always a daunting task for me but I completed this one in record time. May all your magic smoke stay contained

One data point. I have one of those 30v 10a CVCC bench power supplies from Amazon similar to this: https://www.amazon.com/LW-K3010D-Adjustable-Switching-Regulated-Spectrophotometer/dp/B07512KQDW It's

Completed 2.5/2.6/2.7

Lasse, This is the time to use Google for capacitor identification information. Print out every one that you find and keep handy. You will need it if you continue with this hobby. Then step #2……

I would not make any blanket statements about wall warts vs any other form factor, it's what's inside that counts.? We used thousands of fairly inexpensive wall warts at work some 20 yrs ago with