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VLF amateur radio
4 December 2014 | by Being involved in VLF amateur radio is a very specialised activity requiring special (but low cost) kit to be successful. Casual listening is highly unlikely to be successful. Long distance reception of amateur VLF signals usually involves looking for signals using Spectrum Laboratory software locked to a VLF MSK signal so that very narrow bandwidths can be looked at for hours or days on end.
Most amateur VLF tests are done on 8.27kHz as this is unallocated spectrum in many countries.
News about amateur VLF activity can be found at https://sites.google.com/site/sub9khz/ . There has been very little amateur VLF work done this year but amateur VLF signals have crossed the Atlantic.
Tests using utilities assisted earth-mode do not involve big loading coils. Just under 6km has been achieved with just 5W using this mode, before I had my stroke! The kit was simple too. See https://sites.google.com/site/sub9khz/earthmode .
One of the things I am really looking forward to, when fit again, is some more field work with VLF using earth-mode.
One Response to “VLF amateur radio”
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- Matt W1MST, Managing Editor
Hi Roger
I hope you are doing ok? I came across this program for VLF receive
using just a soundcard and I wondered what you thought about it.
Here is the link
https://sites.google.com/site/sm6lkm/saqrx/
And here is a youtube video
https://www.youtube.com/watch?v=UrJ77GiBNQw
If it works ok It just might get more hams listening on VLF
Cheers Roger
73 from Mark