In message <4f64f279.4040...@arcor.de>, ehydra writes:
>Marek Peca schrieb:
>> This was almost the only reason for ferrite rod -- simplicity and
>> attenuation of TVs, some LCDs, 50Hz etc.
>
>If you make the antenna about 10x bigger you can omit the whole ferrite.
I have used two antennas, an unloade air-coil, actually plastic-lid-coil:
http://phk.freebsd.dk/loran-c/Antenna/
and a vertical monopole based on a Chris Trask design I can highly
recommend:
http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf
In my implementation, it covered DC to 200MHz until I low-pass'ed it.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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