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Re: Antenna for LW

Posted: Fri Feb 01, 2019 11:44 pm
by Mike2459
I'll try out the JT9 decoder this evening. I forget what the mode is called (JT6?), but I used to have a lot of fun decoding stuff on 6 Meters using meteor scatter. Then local noise levels started getting bad and ended that.

Re: Antenna for LW

Posted: Mon Feb 11, 2019 10:01 pm
by illllm
i posted LW receiving video here

viewtopic.php?f=10&t=4120

Re: Antenna for LW

Posted: Sat Jun 08, 2019 7:47 pm
by mike0agner
If you want to learn about LW and what you can hear, the Longwave Club of America, which has been around for a very long time, is the place to be. It specializes, as the name suggests, on stuff 530 khz and down. The URL is: https://www.lwca.net/

Re: Antenna for LW

Posted: Tue Jul 02, 2019 10:26 am
by Ian1951
I am not sure of your electronic skills but this paper by the CIA is interesting and deals with ferrite core ELF antennas.
https://www.cia.gov/library/readingroom ... 0007-0.pdf

There is an iogroups page devoted to loop antennas, many of which can be used at ELF/VLF/LF
https://groups.io/g/loopantennas/topics
You have to join but the gang there is very knowledgeable and their files section has antenna designs and how to for everything from ELF through HF.

While not directly related to receiving VLF/LF, the Chinese have built an antenna over 1400 square miles in size.
https://www.cbsnews.com/news/china-comp ... es-report/

I bet the locals receive the signals on their dental fillings.

Re: Antenna for LW

Posted: Sat Jul 06, 2019 6:24 pm
by sdrom33
The US navy has been using VLF with giant antennas to communicate with submerged submarines since the sixties of last century. They have three sites around the world for this very purpose.

Loop antennas are certainly more efficient in VLF than "relay tuned 15' noise reducing vertical antennas", even Dallas Lankfort, the guru of useless pocket antennas, realised this fact.