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No winter field day for me. I'm loving the sunshine state.

Enjoy your experimentation also.. I don't "sling solder" until I've had my morning coffee, cheers! & Kind Regards PS this thread has served its purpose. PM's work great for shout-outs too. Edit: the PC-122XL modulator is not setup like the 148, compare the schematics. Look where the audio...

I've played around with & without the 220 Ohm from emitter to collector, I should try 390 Ohm just to see if I observe any changes in the way it operates. The regulator runs cooler with the resistor. It seems (I'm bad at recording data at home) I had more average power with the resistor, but...

Cool, I didn't know that a copy was floating around of his early build. Yeah I never got an opportunity to join the CB Tricks forum, so I don't know anything about the discussions that took place there. The modulator more closely resembles what is found in the Grant XL/Cobra 148 GTL, looking...

Okay no worries, I must've misread or misunderstood something.

You put the needle at the "CAL" mark, then flip the switch to "REF" while still holding a dead key. Sorry if you already know this, just trying to help.

20Hz - 20 KHz Would be 4 channels at once. 5KHz between the two sidebands, is 10 KHz wide or one channel. 10 KHz of audio frequency gets you at two channels width. 15 KHz of AF, gets you to 30 KHz wide, or three channels. and 20 KHz of AF between the two sidebands would have you at 4 channels...