Thanks will read the link. Think I have in the past but did not have a need. I might guess 4 db would be quite helpful in this effort. I still have some garbage I am seeing that I will need to hunt down. But its not within the house so that really makes things interesting.
On Tue, Dec 21, 2010 at 5:14 PM, Poul-Henning Kamp <[email protected]>wrote: > In message > <[email protected]<aanlktimsqshe%[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. > _______________________________________________ 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.
