> The antenna coil of my xtl radio, made of 30x of 660/46 Litz on a 4" styrene > plumbing coupler, rigged a la' Tuggle front end (double ganged air variable, > one gang tunes ground, the other gang tunes the coil and antenna)..
The crystal radio genre is interesting to me. Do you have a schemetic of that somewhere? I've often thought that a long enough antenna could pick up enough RF to power an amplifier for the front end as a regeneration set. When I was a kid, I remember putting a diode and some sort of meter between a long wire and ground, and got a reasonable current. Run out two or more longwires in different directions. Use one for the desired signal and the others as power pickup for the regen amp. I have some *big* silver plated copper edge-wound coils from some old broadcast transmitters and antennas. One is roughly ten inches in diameter and a foot long on the windings. About 250mh, IIRC. It came from a 1940-vintage Western Electric transmitter. I have a bunch more of similar coils and some humongous air-variable caps, too. Those would have very low loss, maybe better than Litz wire. I think Litz is good at LW, and less effective on BCB. Interesting project, if I *ever* have some free time. Craig Healy Providence, RI _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
