Hi Also consider that there is a maximum practical Q for a rod antenna. Past a certain point the Q goes up because the flux is better contained. For an antenna to work, the flux can't be fully contained. Simply put, a toroid or pot core will make a very high Q inductor. Both make really lousy antennas.
Bob On Oct 19, 2010, at 5:54 PM, Poul-Henning Kamp wrote: > In message <[email protected]>, Brooke Clarke writes: >> Hi: >> >> I've been winding a number of loops for WWVB and have one that looks >> good on test equipment. > > You should do a test where you warm the rod+windings in your hand, > I found the center frequency would drift significantly with even > minor temperature changes. > > It would of course not be unreasonable to temperature compensate a > ferrite rod antenna, but I have been wondering if it would be > possible to build a SDR receiver for 60kHz (or 77.5kHz) where the > CPU autotunes the high-Q antenna based on the detected signal, but > have not gotten the necessary round tuit. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
