Some more VLF Stuff I found

Shortwavewave · #1 (**permalink**) 10-17-2009, 06:37 PM

Well Im not totaly sure this sample(mp3 in a zip file) is RTTY it seems a bit fast, or if its just some odd ball tones, with some static crashes, which is odd because there arnt any storms near me within 500miles at least.

Latly my VLF setup has been like this....using a Zoom H2 recorder much like the setup of a sound card rcvr, the the only diffence is I cant select the freq just yet. I use adobe audition to convert the sample type so a program called Winrad can open it, then thats when I select the freq I want.

In all reality even using my Zoom H2 I can still tell if there is somthing worth recording. I hooked up the antenna to the ground of my car while I was recording and was able to listen to the "RPMs of the engine" not very interesting but Im just telling yall this because I know for sure this VLF Sound Card Stuff actully works. Now how well, or how sensitive it is we wont be able to tell untill I get some real evidence worth showing and bragg about

What I am trying to catch is "whistlers, dawn chours, and some odd ball stuff like that" No luck there but I have heard some weird stuff I wasnt able to hit the record button quick enough.

So has anyone else experimented with this stuf???

Shortwavewave · #2 (**permalink**) 10-17-2009, 10:18 PM

I think im going to make a Blog or GeoCities website to post my finds....idk Ill have to think about it.

kb2vxa · #3 (**permalink**) 10-17-2009, 11:13 PM

I can't tell what that sound is but those aren't static crashes. They're noise spikes caused by random electrical discharge, you can see the high amplitude and extremely short duration on your Audition waveform display. Lightning crashes are of much longer duration, a burst of hash rather than a spike. That's why they're called crashes, like dumping a handful of shot on a hardwood floor.

Shortwavewave · #4 (**permalink**) 10-18-2009, 12:03 AM

Quote:

Originally Posted by kb2vxa

random electrical discharge

Care to explain more??? Ive never heard them quoted, or refered to as this??

See I thought It wasnt lightning crashes but no power lines were around and the nearest ones were about 8miles from where I was, but it is still static right?

I was just in a field of grass.....no man made anything anywhere.

ka3jjz · #5 (**permalink**) 10-18-2009, 10:01 PM

If you are really interested in this extra low stuff, you want to join the Longwave Club of America. There are many really talented folks there that knows a great deal about whistlers and natural noise phenomenon. 73 Mike

k9rzz · #6 (**permalink**) 10-19-2009, 12:11 PM

I'm thinking military rtty. What freq. did you hear this on? I mean, it's not like there's pirates down there running rtty to their buddies. Freq. = ID

Shortwavewave · #7 (**permalink**) 10-19-2009, 04:41 PM

LOL, it was 21khz, with about 300hz bandwidth or baud rate.

I am getting very serious about this VLF, I find myself up at all hours of the night listening to static, waiting for a flippin "whistler" LOL

k9rzz · #8 (**permalink**) 10-20-2009, 08:13 PM

It ain't hard - Google: STATIONS, ITU LICENCES
AND SERVICES BELOW 22 kHz

STATIONS, ITU LICENCES

kb2vxa · #9 (**permalink**) 10-20-2009, 08:55 PM

Originally Posted by kb2vxa
random electrical discharge

"Care to explain more??? Ive never heard them quoted, or referred to as this??"

I don't understand what there is to explain about an extremely broad term that encompasses a wide variety of arcs and sparks. Switches opening and closing, static discharge from petting a cat, what? The air crackles with electricity so it's impossible to be specific in the case of random pops and clicks.

MSM_Maria · #10 (**permalink**) 10-21-2009, 04:04 PM

This is MSK mode of data transmission. Baud rate must be equal exactly 200.
Baud rate in Your record is differ a bit, it means that You have some problems with sound card - not precise sampling rate. In generall, such signals in VLF are usually broadcast station for connection with submarines.
Such transmission is usually well coded.

With best regards, Maria.

p.s

FSK, GFSK, MSK, GMSK and some other modes. - this is the good article about FSK, GFSK, MSK, GMSK and some other modes.

Shortwavewave · #11 (**permalink**) 10-22-2009, 02:11 AM

Quote:

Originally Posted by kb2vxa

Switches opening and closing, static discharge from petting a cat

Switches in the middle of a field 30miles from the nearest town? and 8 miles from power lines?

Im not an expert, but it seems kinda hard for switches and someone petting there cat that far away, by that logic I sould be hearing every VLF thing going on, including the static a car tire makes traveling on the road.

Do me a favor Warren please remove your humor and just explain to people what it is you are talking about, if you feel you dont want to then dont, dont complain about it.

k9rzz · #12 (**permalink**) 10-22-2009, 10:46 AM

Well, if it's not lightning and it's not static ... it must be ... *Gulp* .... aliens. What else could it be??

Shortwavewave · #13 (**permalink**) 10-22-2009, 04:22 PM

I never said is wasnt static...but petting a cat? Really? Yeah if you were right next to it...

As I recall you can hear lightning hundreds of miles away, regular, and these things im trying to catch called whistlers "which is lightning".

zz0468 · #14 (**permalink**) 10-23-2009, 01:43 PM

Warren's point about petting the cat was that there are an almost infinite number of noise sources, they can't all be identified, and some of them will propagate for hundreds or thousands of miles. And yes, you'll probably hear switches 30 miles from town.

Shortwavewave · #15 (**permalink**) 11-03-2009, 12:15 AM

Hello all, update, not sure If I should start another thread but my site/blog is up and running.

Check it out if you like.

Radio Wave Listener