This is a cute little QRP rig that covers 40m, 15m, 10m and 6m.
They’re hard to find and they’re even harder to find intact and not-broken.
It’s a single conversion radio, 8.83MHz IF
FM is an add-on (FM-430 module, like the TS-430)
general coverage receive is an add-on (GC-10)
The Max forward power is first set at 15W, and then tuned for 10W of
Then CW (and hopefully FM; still figuring that out) are limited to
10W using a separate pot, rather than also using ALC.
If you tune the output power max to 10W, then you’ll only ever see
4-5W of max voice power!
ALC min/max calibration is purely for the meter; there isn’t an ALC
min/max setting based on the voice input. The only feedback into the
ALC line comes from the forward power pot and associated circuitry.
Known Schematic/PCB Differences
I’ve found that C61 and R31 on the control board are inverted on
the PCB - C61 goes to the junction of L28/R32, then the ground of C61
goes to R31, that then goes to ground
The two pairs of resistors in the TX mix on the RF board are indeed
crossed on the PCB; the silk screen and layout is wrong!
The service and user manuals should be used together to figure out
what’s going on.