Antenna for LW

Useful information regarding antennas for SDR products.
Mike2459
Posts: 322
Joined: Mon Jul 24, 2017 8:24 pm

Re: Antenna for LW

Postby Mike2459 » Fri Feb 01, 2019 11:44 pm

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.

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illllm
Posts: 56
Joined: Wed Jan 23, 2019 10:26 pm

Re: Antenna for LW

Postby illllm » Mon Feb 11, 2019 10:01 pm

i posted LW receiving video here

viewtopic.php?f=10&t=4120

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mike0agner
Posts: 15
Joined: Sat Jun 01, 2019 2:42 am

Re: Antenna for LW

Postby mike0agner » Sat Jun 08, 2019 7:47 pm

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/

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Ian1951
Posts: 7
Joined: Mon Jun 03, 2019 5:36 pm

Re: Antenna for LW

Postby Ian1951 » Tue Jul 02, 2019 10:26 am

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.
Last edited by Ian1951 on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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sdrom33
Posts: 119
Joined: Sun Dec 09, 2018 4:38 pm

Re: Antenna for LW

Postby sdrom33 » Sat Jul 06, 2019 6:24 pm

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.

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