In message <53bc56fc.3030...@rubidium.dyndns.org>, Magnus Danielson writes: >Hej Poul-Henning, > >On 07/08/2014 09:59 PM, Poul-Henning Kamp wrote: >> In message <53bc4b9f.6040...@rubidium.dyndns.org>, Magnus Danielson writes: >> >>> I have a FS700 sitting here, but no antenna. There should be other >>> signals than LORAN-C/CHAYKA available, such as DCF77, MSF60 and the 162 >>> kHz signal from outside Paris. It would be pretty straight-forward to >>> put up a frame and make a number of turns of wire, and put a low-noise >>> amplifier up in the attic. What existing projects should I look at or >>> take inspiration from? >> >> http://phk.freebsd.dk/loran-c/Antenna/ > >What is your loading on the coil? How many turns? Schematic?
No loading, I wanted flat frequency response. No ideas how many turns, it's not critical. >Cooking up a low-noise amplifier for these frequencies seems relatively >simple, but it is always nice to see what others have done. I just winged it, I looked at the stuff at VLF.IT then the AD797 data sheet and when it worked well enough I stopped. I have also built a "monopole" antenna, based on the schematic on page 6 in this article by Chris Trask: http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf The performance is astonishing: it pulls in everything from the Schumann resonances and ~10kHz russian "Omega-like" naviagation to 100 MHz FM radio, but also every source of noise you can imagine in your neighborhood. In difference from the loop which needs none, this antenna needs a really good earthing. -- 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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.