[GreenKeys] Strange RTTY Signal on 29.684

[UEOGUY]

Well I would try, but there are so many more qualified, I yeild!

Just Bob! 

----- Original Message ----
> From: Peter Gottlieb <nerd at verizon.net>
> To: Greenkeys <greenkeys at mailman.qth.net>
> Sent: Saturday, June 7, 2008 10:19:58 PM
> Subject: Re: [GreenKeys] Strange RTTY Signal on 29.684
> 
> For someone who is very deep into certain aspects of these incredible 
> machines I am about to ask a few very basic questions.
> 
> How is the frequency of the signal determined? 
> Is it the mark or the space? 
> How can you tell on such a signal what is the mark or space?
> How did you determine there is a 78 bit autocorrelation?  What software 
> did you use?
> How about the baud rate?
> 
> Over here in NY I find many similar types of signals and had been told 
> many times they are encrypted.  Indeed, they are not normal 5 or 8 level 
> code as there seems no way to set up to receive without framing errors.  
> Unfortunately, every time I find some real solid signal it is one of 
> these.  I would love to be able to copy, even if I can't decode.
> 
> Peter
> 
> 
> John Vendely wrote:
> > The FSK signal I mentioned in my earlier reply to Geoff's posting is 
> > still present, 24/7, from the direction of Cape Canaveral Air Force 
> > Station. Apparently a ground wave system, the signal is quite strong 
> > in that vicinity, and fairly weak 35 or so miles down the coast at my 
> > QTH.  The exact frequency is 29.824536 Mc, with 100 shift, 82 baud.  
> > The signal is not completely random, but shows a 78 bit 
> > autocorrelation.  Of course, it's not baudot RTTY in the sense we 
> > normally think of, and therefore probably not of burning interest to 
> > most of us on this list.  But it's a specialized, narrow-shift, low 
> > baud rate FSK signalling system of some interest, especially given the 
> > paucity of true RTTY on the air these days.  I have no idea of its 
> > purpose, but further statistical analysis might shed some light on 
> > this.  It would be interesting to know if Geoff's "mystery" FSK signal 
> > shows the same characteristics, indicating the system might be in 
> > widespread use, perhaps by the military, or NASA.  Whatever the case, 
> > it's an interesting choice of frequency, which probably also has some 
> > relationship to its purpose...
> >
> > 73,
> >
> > John K9WT
> >
> >
> > ----- Original Message ----- From: "Geoff Fors" 
> > To: 
> > Sent: Friday, June 06, 2008 1:53 AM
> > Subject: [GreenKeys] Strange RTTY Signal on 29.684
> >
> >
> >> Out here in central California we are picking up a Baudot RTTY signal on
> >> 29.684 MHz which runs 24 hours a day, 7 days per week, continuously.  It
> >> appears to be encrypted.  It's coming in on ground wave as the signal is
> >> about the same strength, day or night.  I haven't taken a look at the 
> >> signal
> >> yet as far as speed, shift, etc..
> >>
> >> Anybody have a suggestion what this might be?  10 Meters is an exclusive
> >> authorization, not a shared band, so it shouldn't be anything 
> >> commercial. I
> >> am guessing it's some sort of military use, although how much Baudot 
> >> gear
> >> would the military still be using these days?
> >>
> >> Geoff
> >> WB6NVH
> >>
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