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Way to go, David ! These QDX rigs are the greatest ! 72 for me and you ! -- Bill ( The Butcher ), N4QA

Charles, How does the ripple look during large current draw when the TX is key'd up? After responding to Pierre's post I got to thinking about capacitor banks on the output to make the drain

I'm relaxed again. Really a good, very good trx. After replacement I could work DX on 17m?. 10 V and 3 Watts. That's enough at the moment. I hope not to kill it again.? I think, the high Band qdx

Yup, been there, done that, got the t-shirt, now have a spare unit for my trouble. I’m so used to autoranging power supplies that I never even saw the yellow sticker advising me that it was set to

Another 30m Q for my sweet li'l QDX. Tnx N0AAS. 72 !

I have a QDX-M and after the final PA transistors and IC5 blew, I replaced them. Anyway, I also amended the configuration in firmware and put the 10m QDX-M on to the 20m band (no other changes made so

To all, I use 2 Mean Well LRS-150-12 PSUs to power my gear and haven't had any problems except one of them produces a high-pitch WHINE when there isn't enough of a load on it. I have them set to

0.1 mm space is a bit tight for the via opening. The pins have part of a mm tolerance on diameter and solder is cheap... Maybe a quarter mm larger diameter to make fitting the part easier... Have

Doh!... Yes, I am... duh sorry for the brain freeze...? I'm feeling better now (grin) Thank you Evan

Mel, Just as an FYI, with my QDX outputting between 2W-3W (I don't have my test records handy, but I know that it's between those power levels) and a 50W PA built for 20m supplied with 13.8V, I get

Glenn, Are you confusing the QDX or QMX with the QCX+?? The QCX+ is a CW rig that can do CW WSPR.? WSPR does not need a computer nor a PTT signal to operate.? It is configured in the QCX+ memory

Great! thanks Mike... That makes me wonder how the rig is switched from xmit to rcv when using one of the digital modes?

On the QCX rigs the PTT is an output. See the QCX+ assembly manual page for your particular rev board as it changed and you need to use the proper wiring for your revision. -mike/w1mt

I'll make an assumption.. the "PTT" jack on the rear of the QCX+ is an input for when you're using a CAT device or some sort of PC software. What I need is a contact closure on transmit, like most

I just read on another thread that T1 rarely needs adjusting on the 20m version. ... continuing my build... just finished installing that boat load of caps!?The assembly manual is absolutely

Next version, hopefully pin spacing corrected and also the holes have a 0.9mm size now. I am having an hard time creating the 3D model in FreeCAD, chamfer is not working and the 3d model is

Thanks Bob, I will correct it, always willing to learn. I found somewhere else it was a 0.7" spacing, then 0.75" and I probably didn't correct it. For the hole, where did you find it? I guessed

Just a point of clarification, the BS170 is not driving 50 ohms. There is a transformer in between that reduces the impedance by the square of the turns ratio. And the turns ratio is the ratio of the

The difference between 3 and 5 watts is rather miniscule (for instance, you are copied at -14 or -15 dB instead of -13 dB); why not simply run the QDX at 10 volts?? K2LYV's calculation would then be

Dave and I have discussed this at length; there are a large quantity of chewed-up textiles from our discussions. To add to his comments,? his calculation below is based on 50 + 0i? ohms, which is a