NEW DEVELOPMENT: New T1 winding procedures for QDX were announced. "WTS (Weird Twisted Sister)" winding instruction for 9V / "RWTS (Really Weird Twisted Sister)" winding instruction for 12V are compared favorably with the conventional T1 winding instruction in the manual. These reportedly get you slightly better RF output. But, it sounds like these solve many conditions that blow MOSFET finals. This is my favorite video build for the QRP-LABS' QDX. I think I better double check whether I used the larger gauge wire for winding L14. (I had a surplus bit of larger gauge wire and barely enough to finish the other toroid coils.)
I just streamed this video, I bought 2 Version 3 QDX Transceivers from Hans, and assembled one back in June when I got it but never hooked it up to anything to test. This morning I worked WB2JNQ in FN30 from FN42. Then this evening I built the second kit, and later this morning I'll test that one out also. Worked no issues, but can't feed it more than 12V or it will get HOT HOT HOT!!! 73 de Matt NA1Q
Josh, Great job doing that build live. Much braver sole than I. My trick for removing enamel is to burn it off before I place the parts so one, I know it is good and so I don't overheat the board. I just use a big blob of solder on the iron and you can smell the enamel when it burns off. Then I scrape any residue with an Exacto knife.
I used to watch Louis Rossmann fix Macbook circuit boards. He doesn’t do much of that (You Tube) right now. He has difficulty getting parts. He should change to HAM radio kits. (He is now in Texas) You have the advantage of fresh new boards in a kit with genuine parts. Maybe you could work together on some videos.
I had to do a "minor" repair on my 2 meter 1kw linear that involved lifting the board off the heat spreader. I used some Arctic Silver MX2 thermal compound under the output transistor and idle temps in the amp dropped 5 degrees F and when running 750 watts SSB(I never push to max output, amps run longer and cooler) abut 20F cooler. Using a quality compound vs the cheap generic silicone paste can make a difference!
Built my QDX a couple of weeks ago, first ever build. You mention a couple of times about using this for Winlink, however since the QDX only supports FSK (because of how it's implemented) the doc states this won't work. In fact, thinking perhaps that was a "theoretical" issue, I have tried Winlink with no success. However, I have been able to do Winlink with my truSDX on 20, 30, and 40. I think it's the difference between "real" SSB vs digital only FSK and how the signal is sampled in the QDX.
My OCD forced me to stop watching after capacity C20 was skipped. I don't know if that is an obsolete cap on the board or whether the kit was missing a capacitor or whether Josh just missed it. But I just kept staring at that black C20 spot. He picks it back up and installs it around 1:32:15 in the video.
I have built 3 of these with out issues. One V1 and 2 V3's. Full power output on all 3. Alot of fun to build but not a beginner kit by any means.
I enjoy the kit builds . Thank you for doing them.
NEW DEVELOPMENT: New T1 winding procedures for QDX were announced. "WTS (Weird Twisted Sister)" winding instruction for 9V / "RWTS (Really Weird Twisted Sister)" winding instruction for 12V are compared favorably with the conventional T1 winding instruction in the manual. These reportedly get you slightly better RF output. But, it sounds like these solve many conditions that blow MOSFET finals.
This is my favorite video build for the QRP-LABS' QDX. I think I better double check whether I used the larger gauge wire for winding L14. (I had a surplus bit of larger gauge wire and barely enough to finish the other toroid coils.)
Just finished this kit, and glad you put a video on it. Thanks!
I just streamed this video, I bought 2 Version 3 QDX Transceivers from Hans, and assembled one back in June when I got it but never hooked it up to anything to test. This morning I worked WB2JNQ in FN30 from FN42. Then this evening I built the second kit, and later this morning I'll test that one out also. Worked no issues, but can't feed it more than 12V or it will get HOT HOT HOT!!!
73 de Matt NA1Q
Josh, Great job doing that build live. Much braver sole than I. My trick for removing enamel is to burn it off before I place the parts so one, I know it is good and so I don't overheat the board. I just use a big blob of solder on the iron and you can smell the enamel when it burns off. Then I scrape any residue with an Exacto knife.
I used to watch Louis Rossmann fix Macbook circuit boards. He doesn’t do much of that (You Tube) right now. He has difficulty getting parts. He should change to HAM radio kits. (He is now in Texas)
You have the advantage of fresh new boards in a kit with genuine parts. Maybe you could work together on some videos.
I had to do a "minor" repair on my 2 meter 1kw linear that involved lifting the board off the heat spreader. I used some Arctic Silver MX2 thermal compound under the output transistor and idle temps in the amp dropped 5 degrees F and when running 750 watts SSB(I never push to max output, amps run longer and cooler) abut 20F cooler. Using a quality compound vs the cheap generic silicone paste can make a difference!
Built my QDX a couple of weeks ago, first ever build. You mention a couple of times about using this for Winlink, however since the QDX only supports FSK (because of how it's implemented) the doc states this won't work. In fact, thinking perhaps that was a "theoretical" issue, I have tried Winlink with no success. However, I have been able to do Winlink with my truSDX on 20, 30, and 40. I think it's the difference between "real" SSB vs digital only FSK and how the signal is sampled in the QDX.
Ahh great point.
Love kits. 👍👍👍❤️👍👍👍
Learned heaps!!! Thank you! 👍💥
My OCD forced me to stop watching after capacity C20 was skipped. I don't know if that is an obsolete cap on the board or whether the kit was missing a capacitor or whether Josh just missed it. But I just kept staring at that black C20 spot. He picks it back up and installs it around 1:32:15 in the video.
Lol. It got in
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