[time-nuts] LORAN C antenna thoughts from the group

J. Forster jfor at quik.com
Tue Dec 21 18:59:30 UTC 2010


I remember reading somewhere that the envelope of the LORAN pulses was
shaped to reduce the transmitted BW.

Does anybody have a reference for that, and relatedly, what does the BW of
the antenna have to be? Typically, loops are about 90 KHz to 110 KHz, but
can that be narrowed down?

Best,

-John

==============


> In message <AANLkTikgJbL4Yvpifgp8eDFQFiRacaARMxHi5jqSoU=h at mail.gmail.com>,
> paul
>  swed writes:
>
>>OK now that I can actually receive the 90070 chain in the US. What might
>> be
>>a better antenna then my whip and preamp?
>>A big loop and preamp? A tall vertical over a ground plane. Tried 67 ft
>> that
>>yielded little. How might reception be improved in the US?
>
> I built a trivial loop based on a design-idea I found at vlf.it
>
> 	http://phk.freebsd.dk/loran-c/Antenna/
>
> It's basically a loop with an AD797 amplifier and some power-filtering,
> didn't even write a schematic for it...
>
>
> --
> 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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