I guess that I would start with the core nearly falling out of the top of the coil and adjust in from there until it nearly bottoms out... cover the entire range.
With the transmitter antenna disconnected, trying to get a signal to a couple of vintage sets 15 ft away might be pushing the distance limit somewhat... do you have a nice sensitive little portable radio that you can put *very* close to the transmitter?
jr
Last edited by jr_tech; 08-09-2013 at 08:17 PM.
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