Re: QDX PTT to QRP LABS Amp
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
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Bojan Naglic
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#90681
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Re: What to do when the moderator is busy working VK* on 20m.
#qdx
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
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Michael VE3WMB
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#90680
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Re: BS170 MOSFETS
If there was a conduction cooled version that would be mounted on a surface :) Stewart/G3YSX >
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Stewart G3YSX
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#90679
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Re: QDX PTT to QRP LABS Amp
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
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Evan Hand
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#90678
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Re: QDX v3 Lost transmit on 20/30/40
#troubleshooting
#qdx
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
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Evan Hand
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#90677
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Re: QDX PTT to QRP LABS Amp
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
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NT5AT - Wilson
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#90676
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
QDX transmitter at N4QA gets its very first reception report via PSKReporter !
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n4qa at_hotmail.com <n4qa@...>
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#90675
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Re: QDX PTT to QRP LABS Amp
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
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Bojan Naglic
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#90674
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QDX soundcard settings on Raspberry Pi or Orange Pi?
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.
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Paul Egan
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#90673
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Re: QDX v3 Lost transmit on 20/30/40
#troubleshooting
#qdx
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
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Daniel Conklin
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#90672
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QDX v3 Lost transmit on 20/30/40
#troubleshooting
#qdx
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
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Marc N8LO
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#90671
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
The PC, Willie !
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n4qa at_hotmail.com <n4qa@...>
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#90670
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
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
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n4qa at_hotmail.com <n4qa@...>
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#90669
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
So, what changed? 73, Willie N1JBJ
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William Smith
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#90668
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
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,
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Evan Hand
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#90667
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
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 !"
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n4qa at_hotmail.com <n4qa@...>
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#90666
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
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...
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n4qa at_hotmail.com <n4qa@...>
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#90665
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Re: Artwork for "Manual Days" Chinese Antenna Tuner
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
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_Dave_AD0B
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#90664
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Re: QDX: Receiving great but needs more audio output gain in order to xmit for more than 250 milliseconds.
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
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n4qa at_hotmail.com <n4qa@...>
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#90663
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Re: QDX PTT to QRP LABS Amp
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
By
Bojan Naglic
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#90662
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