In message <[email protected]>, paul
swed writes:
>Is there a real advantage to a 4 or 6 foot big loop compared to a small
>loop?
>I use a 3 foot loop on wwvb/preamp and that works well.
There is a very good and simple explanation of the theory behind
loops here:
http://www.vlf.it/octoloop/rlt-n4ywk.htm
Sensitivity rises with the area of your loop, so doubling the diameter
gives you four times the signal, which may or may not be a relevant
low number of dB.
>One other point on the wavefrom on loran c. It was constructed to minimize
>the impact of skywave influence on the receiver. Essentially making it
>easier for the receiver to distinguish between the two. Thast what I hadread
>in the loran docs.
Yes, this is why you should always zoom in on the 3rd positive
zero-crossing. Inside the announced service areas, the skywave will
never arrive early enough to disturb the groundwave at that point.
>PS I thought the bw was +/- 10KC and even wider.
Yes, it is, but the amount of actual energy once you get past
+/- 10kHz or 15kHz is very very limited.
The perfect bandwidth is where the S/N of the loran-C signal
is 1:1, but I have never found a good way to determine that
automatically.
--
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.
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