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“the same theory could be used for outdoor mounted part 15 transmitters using a 3 meter whip.”
The TH 5 has that. Just connect it to a whip instead of the wire.
The “line” side wont be 50 ohms, more like 2 and less on the hots to neutral and above 50 from isolated earth ground to neutral.
The very wide swing of inductance that occurs on the power grid would require a sampler also capable of “seeing” this wide variance. Not that big of a deal really….but…these variances happen in time intervals and durations from microseconds to hours. Most of the changes take place when the grids are well loaded (evenings/mornings).
Now the trick would be to have the auto-sampler-coupler be capable of tracking these changes closely to maintain maximum RF transfer efficiency, but at the same time constantly provide the transmitter a proper match..ie 50 ohms while the auto-sampler-coupler compensates for the “line/neutral” side of the system.
Another consideration is that the coupler needs to perform as a low Q, high pass filter, and do that while auto-adjusting and maintaining the match to the TX. This is to isolate the TX from the grid and prevent 60 cycle AC energy from feeding back into the output of the transmitter, which would otherwise modulate the final and produce hum.
Hope that gives some guidelines for your great idea for an automatic CC coupler. Go for it!!! 🙂