I read "horror" stories about a bad - , not -, half working QDX's. But against those few incidents mentioned here in the group there must be hundreds of hams with QDX transceivers which are running as

I have completed the build of QMX #008! Now the search of the shop to locate a 12V source to power it up. I've read the concerns of not exceeding 12V - and the 13.8V on the bench is too high. SLA batt

I built 2 of the 10A Power Amplifiers and in testing I managed to fry both of them. For testing I connected the input to an RF signal generator (BK-Precision E-200D) and the output to a 50Ω resistor.

Sometimes slippery little capacitors are packed really tightly together and are very difficult to hold for removal. This has worked for me. 1. Tie a slip knot noose in a 8 inch piece of dental floss (

Hi all Hannes DL9SCO (Palm Radio keys) is visiting for a few days and we took a QMX out for an afternoon of mountain portable operation here in SW Turkey. Had great fun on 20m CW. TA4/DL9SCO had 8 QSO

I just successfully finished building two qmx's. I haven't checked out the sensitivity or plots yet. Never built a qdx so am unfamiliar with things such as plots... Anyways a little reading and I'll b

Hello, Does anyone know the part number I could use to find the right 47uH axial inductors used in the QMX? I need to get a few more. The ones I was able to buy from Amazon turned out to be too large.

Hey Hans and the gang; I finished up my QMX (serial number 100) on Tuesday evening and added in the ALPHA firmware load the following/yesterday evening. Here's my list of "Mis-Steaks" (including sugge

This month, a year will have passed since my brother Robb (N2VJO) presented me with a QDX as a birthday gift. A very thoughtful gift indeed; for he purchased a pair of them on the premise that we coul

Well, my QDX may not be on *ALL* bands but give me time ! 72, Bill, N4QA

I did comparison BPF scans of my QMX (rev 1) with my QDX (rev 2, f/w 1.4). QDX scans look good, QMX okay on 80, 60, 40, & 30m, but poor on 20m. Readings pretty much match my CW estimates of sensitivit

Looking for help to get my 10W HF Amp working. I am able to set quiescent current for PA stage but can't get any output. I suspect there is a problem with the driver stage. Measured voltages are:- Q20

I've been trying to connect my qdx to a linux installation on an Inovato PC. Ikeep getting a connection error. Since I'm a bit lax in my linux skills, I thought I'd try on a laptop that I've used for

I've built three QDX units so far and they all work fine, but now I've hit a snag on #4. Rev 3a PCB, I removed the short at the very beginning of the build. Built for 9 Volts. Power-on with a 7.5 Volt

The following files and folders have been uploaded to the Files area of the QRPLabs@groups.io group. /DK5LV/QSX amp Messung_neu.xlsx By: Henning Weddig <hweddig@...> Description: my new measurements o

Awesome little radio. Made a few FT8 contacts and some local CW exchanges…. There’s a lot of magic in that little box! Just the big knobs to contend with……maybe I can borrow little knobs from my QCX?

Hans: Soldering completed. Mechanical assembly performed to ensure everything fits, no minor adjustments. Question, clean the boards, or not? Your recommendation is solicited. Use Kester SN62PB36AG02

Hello all Just want to share my experience with replacing IC2 5V voltage regulator with DC/DC converter. I put in Traco TSR 1-2450 DC/DC converter which is designed to be a direct replacement for 7805

I saw it once but can't put my mitts on it now. I know it'll be awhile before it ships but I'd like to keep an eye on the progress Glen - KE7FD -- Glen - KE7FD

Hello all. Here's a question...My QCX+ 40 has apparently forgotten how to send paddle at anything less than 20 WPM. No matter how I set the Keyer Speed, it still runs at 20 ( as reported on RBN). I've