The cases are all 3D printed by Al and the faceplates are photopaper with cutouts done with an Xacto knife. (The Morse Code tutor is not and is the same case we used for the Antenna Analyzer project

My Flukes 87s... show .655V at 11MegOhms... And 3.55V when testing diodes. Both show the same. And what do yours show? Thanks!

Too many to list but just get another voltmeter and measure across the leads yourself.

Congratulations! Can't wait for the book. In the meantime, can you divulge the source for those neat looking cases housing your projects?

PLEASE LIST these multimeters that put 12V on the testleads. Thankyouverymuch! de SkipF, NT1G

I think this has been mentioned before but be careful when checking for shorts around IC's. Some multimeters feed out up to 15 Volts across the test probes which can blow a sensitive IC

And check D1 is supplying 3.5 volts to IC1 73 Alan G4ZFQ

This means that IC2 is not communicating with IC1. Check that pins 27, 28 of IC2 are soldered and connected correctly. Also check around IC1 very carefully with a glass. There have been reports of bad

Not positive on the QCX, but on all other devices from here that I've built, it means the micro isn't talking to the synthesizer (Si5351A). Check solder connections. 73 Mike N0QBH

Good evening I have finished my QCX 40m and I gaet an error. After the waming up the display shows "SI5351A error" Any other get this kind of error? Thank you

To all; Just wanted to dot I's/ cross T's on information about my QCX that I finished 2 days ago. My initial post indicated I had problems when starting Peak BPF. I was told

Thanks for the preview Jack. Now I know where all my spare money and time will be going next summer. Looks like some interesting projects. Hope the book does well. Art N4EZZ

All: I've been rattling on about the "new Projects" book off-and-on for about a year. Al (AC8GY) and I are sending the book to the publisher (ARRL) on Friday, completely finished and ready to go! The

Good morning Ron, Thanks for the note back - much appreciated. I'm going to check the RF output of the QCX today. The features packed into this little radio are incredible! I still need to erect an

Hi Jim. That single lever keyer will work the same in all three modes supported by the QCX. Since it doesn’t have the ability to squeeze to get Dit and Dah inputs simultaneously, it won’t activate

I'm brand new to this forum and this is my first message. I'm getting back into amateur radio after a very long hiatus. I had a blast building the 40-m version of the QCX. I have a Vibrokeyer

Hi Alan, Game over as I don't have a replacement for IC3. I did order another 40 QCX and i will take all the experience and now with skills at voltage checking, do better next time. Again thanks and

George, That's enough to tell it is going to TX mode. You need to remove IC3 and test the voltages on it's pin 4 and pin 12 pads, RX and TX modes. IC3 can be removed by carefully cutting each leg

Summary: check for shorts between legs of the surface mounted devices before you start (additional cautionary note to add to manual?) Background: I first bought and built one 40m QCX - all worked

D!1 at output is 3.3 and IC1 pin 1 is 1.8 assuming that is top right pin.