SWEDISH VERY LOW FREQUENCY (VLF) TEST TRANSMISSION ON 17.2 kHz

OK, I've downloaded that tiny software and ran it. Amazing! Now, to build a basic coupler/protection ckt, and hook up an antenna! This should be interesting!

 

RESULT OF THE 17.2 KHZ VERY LOW FREQUENCY TEST TRANSMISSIONS.

Hi VE4CY here are the test transmission results,

Hi N1NKM here are some VLF internet receivers that will give you an idea of what frequencies are active.

The SAQ Sweden Morse code (CW) test transmission on 17.2 kHz was heard in Russia (Moscow), England (Sheffield), Portugal (Lisbon) and the USA (Boston).

The spectrum display of some of these receivers are on the Internet site of the World Wide Lightning Location Network WWLLN http://webflash.ess.washington.edu/

For example if you click on the Brisbane (Australia) Very Low Frequency receiver spectrum display you can expand the image and you will see the frequencies along the vertical axis.
0 kHz is at the bottom and 24 kHz is at the top.

The horizontal axis shows the time. You will see a yellow horizontal line below 20 kHz. (That was the colour when I saw it at 0200 UTC, the colour indicates the signal strength). This is the spectrum display of the VLF signal of the 1000 kW Royal Australian Navy submarine broadcast station at Exmouth, North West Cape, Western Australia on 19.8 kHz.

Good listening!

Sam VK2BVS, 6O0A
Email somaliahamradio@yahoo.com
Web http://somaliaradio.blogspot.com

 

LF band (10 to 300 kHz) upconverted to HF Receiver

If you want to use a real radio. Here is a very cheap kit.
http://jacksonharbor.home.att.net/lfconv.htm
The kit claims to use IF's in the ham bands and tune the LF band (10 to 300 kHz) which will be upconverted to HF
Most Ham Receivers are Deaf below 400khz
the site also has the LF Converter Schematic Diagram and manual. If you have a lot of parts in your junkbox it could be homebrewed for nothing.
73 and HNY see you in the CW Pileups
Larry
VQ9LA

 

listening to these frequencies

Hello to all,

I just stumbled upon this thread and am rather interested.

I own an Icom PCR-1500, which will receive down to 10 KHz and its connected to several antennas (one of which covers down to 10 KHz).

I guess my primary question is, what mode are most of the transmissions
in the 10 KHz to 100 KHz range (AM, SSB...?) I've spent numerous hours scanning these frequencies for any kind of transmission but just don't seem
to find anything but static.

So if someone here could give me some pointers or tips on when/how to tune in these frequencies, maybe recommend a good antenna, I'd really appreciate it.

Thanks,
Tory W.

 

The vast majority of activity in the VLF range is CW. There may also be some slow-speed, narrow-band RTTY or PSK type signals, but certainly no voice comms.

 

Software is located: https://sites.google.com/site/sm6lkm/saqrx

 

SAQ on 17.2 kHz - January 03. 2011

Hello all

Now first time with simply SAQrx - Panoramic VLF receiver v0.6, from SM6LKM :

http://www.youtube.com/watch?v=D1v7Iv_YO78

Very good worked with Mini Whip antenna - PA0RDT

Regards

73, Joze s52ab

 

In Europe there is some. There's some very high power AM broadcast stations around 160-190 kHz. I listen for them once in awhile.

http://www.w0btu.com/files/misc/AMANDX longwave broadcast stations.html

 

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Apache/2.2.3 (Red Hat) Server at web.telia.com Port 80

 

Very interesting - I might have to give that a shot in a little while! And hello to VK2BVS from a fellow North Shore boy - ex of Champion Rd Gladesville and a Balmain Tigers supporter since birth (now turned to the dark side - rugby union..)

Scotty M6OZI