[GreenKeys] Teletype on 4.004 Revisted

[epvgk at limpoc.com]

On Sun, Nov 24, 2013 at 10:22:18PM -0600, Ron Kolarik wrote:
> The mystery signal is also on 5339kHz. I've got it running in 2 panadapter windows
> and they are identical. 4004 is S-9+10  5339 is S-9+. The loop isn't up for the winter
> so no null/peak possible with the current antenna. I'm in Nebraska. 0419z
> 
> The hardware is most like "glass" TTY and not mechanical. This looks a lot like
> the encrypted stuff that used to reside on the 30m band. Someone told me that
> one was NAVY from Maine I think.
> 
> Ron
> K0IDT

I think from reading about this stuff a while back that these 850Hz shift FSK signals 
(and there seem to be lots of them on HF) are encoded using a protocol called 
STANAG 4481 FSK. The datastream is apparently encrypted with KG-84 encryption equipment. 
http://en.wikipedia.org/wiki/KG-84

eric

> 
>   ----- Original Message ----- 
>   From: Larry 
>   To: greenkeys at mailman.qth.net 
>   Sent: Sunday, November 24, 2013 7:14 PM
>   Subject: Re: [GreenKeys] Teletype on 4.004 Revisted
> 
> 
>   On 11/24/2013 6:10 PM, Charles Ring wrote:
> 
>     To me the interesting part is that this signal has been there, completely unchanged, since 1968 or probably earlier. Same speed, same shift, same every observable characteristic. This, long after the original hardware would have become unrepairable from lack of parts and/or people with the needed skills.
> 
> 
> 
> 
>     On 11/24/2013 1918, Duncan Brown wrote:
> 
>       it is strong in upstate NY also.  I can hear it in the house on a portable with the whip down all the way.
> 
>       Maybe we need to set up a DF net.  Anyone have an AN/PRD-1??
> 
>       Duncan
>       USASA 31J
> 
> 
>       On 24-Nov-13 18:41, NNN7DXB at aol.com wrote:
> 
>         Richard:
> 
>         Thanks for that report. That 4.004 RTTY is still there again, right on time,
>         and sounds close enough to be in the next room here in SC. Very strong
>         and very clear. 
> 
>         I am amazed you can hear it in Los Angeles. We know from another in
>         the group that it is (was) also heard in Indiana. 
> 
>         Dave
>         ------------------------------------------------------------------------------------------------
> 
> 
>      
> 
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> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.htmlOne thing about its long term residency on that freq, it keeps people wondering what it is all about.  Apparently so far no one has figured that out.  Including the Chinese or Ruskies.
> 
> 
> 
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