Very cool! We have never used a voltage-doubler in a carrier control, but we found that controlling the modulated power to both final and driver would slightly reduce the peak power. The problem is that a transistor will always drop a Volt or so from the circuit. The peak DC voltage on voice peaks will be a Volt and a half or so lower than it was stock. This reduces the peak power the final can muster. Not so different from the Uniden/Cobra 40-channel SSB radios. They used a NPN transistor in a Darlington pair both to modulate the DC power and control the carrier. Users would notice that the modulated peak power was always a bit less on AM than sideband. Naturally the AM-modulator transistor is not in line with the driver/final's collector power in sideband mode, putting an additional Volt and a fraction onto their collector circuits in sideband modes. Not enough difference to spit on. Just enough to see on a wattmeter. But people want what they want no matter how useless it may be. The fix is to modulate the radio's final directly and control only the driver's collector voltage. Sounds just as good. Reduces the heat-sink requirements for the carrier-control transistor in a big way.
Also found that powering the clockwise lug of the carrier-control pot from the cathode of D9 would goose it to swing the same at any carrier setting. Since our whole setup is downstream from D9 it needs an electrolytic cap in parallel with it so the audio peaks have a low-impedance path to the driver's collector.
Always more than one way to skin a cat. Found I preferred the simpler approach.
Way cool!
73
