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Evan, With your observations and suggestions I am quite sure now that my Q5 turned his head away when I was trying to PTT trigger the PA for the first time from an unmodified QDX.? But I have not

Hans, somehow the Moderator Notifications must have been changed for this group. It is not easy to find these settings.??You can check / change these notifications by first going to the main page

If there was a conduction cooled version that would be mounted on a surface :) Stewart/G3YSX >

Will, The maximum current that the 50watt amp input should need would be 7ma.? The current would also go down as the voltage goes down due to a lack of drive capability.? This supports your

Hi Marc, As Dan stated, the first step is to connect to a dummy load and verify that the current in receive mode is less than 140ma.? If not, you will need to remove the 4 BS170 MOSFETS and try

How would I test this on my two amps. I had made the assumption that because I got the same results on two different amps (20m and 40m version), that the issue had to be with the QDX. I do know that

QDX transmitter at N4QA gets its very first reception report via PSKReporter !

Hi all, Just to report: Q5 was a bad guy pushing the PTT line to 2V.? I don't know the reason for the Q5.? I left the 100R parallel to R10 in the QDX in as I think this way the switching is more

I just received an Orange Pi 3 LTS and installed WSJT-X on a Debian image. CAT works fine but the soundcard setup is missing the "alsa_input.usb-QRP_Labs_QDX..." entries for both input and output.

Marc, have you tried putting it on a dummy load and measuring the output from the dummy load using a DVM? The best way to do this is using the terminal applications to transmit, so you can eliminate

Looking for some troubleshooting steps.? I can measure V,A,R,C,L.? No scope. 9V build, after build and testing, I had power output on all 4 bands.? I put it in the case and lost 20M transmit, may

The PC, Willie !

QSL. Evan. I just now adjusted ps vdc to 10.0 and now power out is 4.5 watts? ?perfectly legal for QRP ! Tnx, 73, Bill, N4QA

So, what changed? 73, Willie N1JBJ

Hi Bill, Good news on figuring out the issue.? I recommend dropping the voltage supplied to the QDX to keep the output under the recommended 6watts maximum.? If your power supply is not adjustable,

Hot dawg ! Have a good match on 80m and getting 7 entire watts from QDX ! VDC drops from 12v to 11.8 on xmit and she's pulling about 900 ma xmit. AS Rod Stewart always says " Tonight's the night !"

EUREKA ! Now we're getting somewhere ! I use three PCs around here for various purposes - two Dell core i3 machines w/ Win 11 Home and this one, a Dell core i5 machine running Win 10 Home. Hmmm...

Thanks for the post, printing custom decals, how cool. I have a lot of homemade cases and don't always remember which jack or knob is which. Here is the knob that I printed. It uses 3mm or 1/8" set

Tnx, Ken. The only program I have tried to key QDX with is WSJT-X. And, I still can't seem to find any audio setting, slider, Windows etc that is not already set to maximum. Someone suggested trying

Hi all, Time to confess... I have deleted my last message because I made some mistakes at writing my measurements results in post.? Here they are: 1) I measured now the voltage at the PA PTT line