Bag of parts, enclosure, labels, parts list, schematic
- Assembly was straight forward except winding of the main toroid. Fortunately there are a few other sites out there with good winding information and pictures.
- Wiring of the trimmer caps was a little tight during soldering.
- Holes had to be drilled in the enclosure but was easy enough to do with the provided labels.
- The knobs provided use a strange combination of nuts, washers, and screw to secure them to the trimmer capacitors.
Operation and Comments:
- The knobs keep working their way loose.
- This was the first Chinese kit to totally fail for me (see Update below). It seems to work but I loose half the power in both receive and transmit when using it. Also the inductor switch only has an effect in the first 2 positions. I can see the LED dim but only when the 2 capacitors are fully meshed.
- Measured the 2 trimmer capacitors and they check good. I have heard some complaints of non-working trimmers in other kits.
- Re-wound the toroid twice.
- I have even tried to re-wire it from a T to PI configuration with the same results.
- Removing the LED meter board did not affect tuner performance.
- Next step will be to remove the toroid from the switch and check the switch (forgot to do that on the second re-wind). Also purchasing a better L-meter to check the toroid.
- Update – It was a faulty switch! Strange effect as the switch rings true on a continuity test but applying RF is a different story. With the new switch it’s working as advertised.