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QMX 60-15m Rev 4 troubles

 

I am happy to report that a bad 22 gauge wire connection appears to have been the remaining problem with SWR.? To resolve the problem, I discarded the enamel wire primary and went with a bare copper wire and a 1 mm i.d. x 2 mm o.d. PTFE tube to make the installation a lot less prone to my ham-handedness at the installation of the primary "winding".? I've attached pictures of the soldered transformer and a 'transmit' reading into a dummy load for all 5 bands. In fact pretty much all of my sweeps now look better than before.? I'm going to button the boards up into the case and see how it performs when connected to an antenna.? For completeness sake and to potentially help others, I'll also post all of my sweeps in the next day or two (especially if the transceiver actually works on the air!).? Thank you so much for helping me get there.? I think a 2 cm piece of tubing and 10 cm of bare 22 gauge wire added to the kit might resolve a lot of issues with improper installation of T501...

73!
Spencer WD4AWD
 

Great for hanging in Spencer!

Greg


On Thu, Jun 13, 2024 at 5:40 PM, Spencer WD4AWD
<sehochst@...> wrote:
I am happy to report that a bad 22 gauge wire connection appears to have been the remaining problem with SWR.? To resolve the problem, I discarded the enamel wire primary and went with a bare copper wire and a 1 mm i.d. x 2 mm o.d. PTFE tube to make the installation a lot less prone to my ham-handedness at the installation of the primary "winding".? I've attached pictures of the soldered transformer and a 'transmit' reading into a dummy load for all 5 bands. In fact pretty much all of my sweeps now look better than before.? I'm going to button the boards up into the case and see how it performs when connected to an antenna.? For completeness sake and to potentially help others, I'll also post all of my sweeps in the next day or two (especially if the transceiver actually works on the air!).? Thank you so much for helping me get there.? I think a 2 cm piece of tubing and 10 cm of bare 22 gauge wire added to the kit might resolve a lot of issues with improper installation of T501...

73!
Spencer WD4AWD

 

Hello Spencer,

congratulation. You did a great job. Enjoy your new toy.

73, Ludwig
 

On Thu, Jun 13, 2024 at 06:19 PM, @Ludwig_DH8WN wrote:
Hello Spencer,

congratulation. You did a great job. Enjoy your new toy.

73, Ludwig

Thank you Ludwig for your excellent help!? You did a great job, too!

Oh, and a connection to an end-fed half wave on the RBN network... IT LIVES!



73,
Spencer WD4AWD

 

Oh, you reached a station in south Germany, only around 300 km away from me.

73, Ludwig
 

Excellent! I checked my logs and we've had 7 QSOs from March 2024 to a couple days ago! The recent ones I was using a new built QCX. 72 de AI5DD?
 

The QMX is really working well.? I did a 'search and pounce" POTA activation this evening during ARRL Field Day using the FD exchange and was able to log about 19 stations in an hour on 15 and 20 m, including an ATNO for me:? Saudi Arabia!? This little transceiver is awesome!!

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