Dear SN3AK builders, I was part of the first group buy with 2 kits.
After building the kits I've tuned the RF filters according to the video by DL2MAN and the information in the efficiency topic and they are spot on.
I've also checked the low impedance filters and they are ok too.
But now comes the tricky part. Before I tuned the filters I've noticed efficiency figures reported by the truSDX between 67% en 78% I'm unable to get them any higher.
After tuning the RF circuit the RF output got a bit lower even and the efficiency drifted just a little bit.
I am very curious what your findings are with the built of this kit and there efficiency figures.
Here are mine:
12V before tuning filters
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80M * 6,77 W * 70,7% Eff
60M * 4,77 W * 78,5% Eff
40M * 4,22 W * 75% Eff
30M * 5 W * 73,7% Eff
20M * 3,7 W * 67,4% Eff
12V after tuning filters
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80M * 6,1 W * 78% Eff
60M * 4,66 W * 79% Eff
40M * 3,99 W * 76% Eff
30M * 4,71 W * 73,5% Eff
20M * 3,76 W * 67,1% Eff
The accuracy of the output in Watts and Efficiency are within 5~10% based on measurements with an external power/RF meter. So I don't think it's the T1/T2 combo but it lies somewhere else.
Please let me know what your efficiency figures are measured in a dummy load.
P.s.
The radio works with the current Efficiency figures I was able to make a few contact in the EU on CW en SSB without any remarks on audio/signal integrity just using the internal mic/speaker and a simple (resonant) end-fed.