[time-nuts] Active LORAN antenna

paul swed paulswedb at gmail.com
Fri Aug 26 23:37:06 UTC 2011

Thanks for the link. Just ordered parts.
Talk about cheap! Mouser electronics had all of the TO92 parts.

On Fri, Aug 26, 2011 at 3:27 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

> In message <4E57CBEE.3000509 at pacific.net>, Brooke Clarke writes:
> >You might consider the AMRAD active antenna that they designed for the
> >136 kHz ham band.
> If you want to build an active monopole, Chris Trasks "secret" design
> is far better and far more manageable than the AMRAD:
>        http://www.home.earthlink.net/~christrask/Paper007.html
> I built this one with BFQ19+BQ149+J174+J310 all in SMD parts.
> (J270 is a better choice than J174 which tends to forward bias)
> With my primitive measurement methods, it was flat to 100 MHz
> and tapered off just short of 800MHz.
> In the other end it reliably pulls out the Russian ELF (OMEGA like)
> navigation system down around 10kHz.
> Chris mentioned that a kit might be underway, but I havn't seen
> any sign of it anywhere...
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at 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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