Hi John, I think Lyle Kohler K0LER (?) has a version with the J310 on his site. I have seen cases were J310s were placed in paralled to get better IMD performance and maybe lower noise but that is not a problem at LF. They do work well but like all voltage probe antennas need mounting high for best performance. Another fairly popular antenna in the LF field is a circuit by Roelof Bakker PA0RDT where the whip is replaced by a square inch of PCB pad. This has proved exceptionally good in some noisy urban appartments and hotel rooms mounted out off the balcony on a length of cane.
Alan G3NYK ----- Original Message ----- From: John Miles <[EMAIL PROTECTED]> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: 20 July 2007 04:55 Subject: Re: [time-nuts] Active LF Antennas > > > Since the article and FAQ on the AMRAD site were > > written, the split bobbin transformer is has become > > available from Digi-Key. You don't have to special > > order it. > > > > I was glad I ordered 10 of the Crystalonics JFETs for that project. Four of > them were defective as delivered (D-S short). You can save some bucks by > going the J310 route first and upgrading to the CP666 only if you actually > have IMD problems. > > -- john, KE5FX > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.