[GreenKeys] [Fwd: Re: Questions about some signals on the air.]

Sat May 26 23:59:46 EDT 2012

-------- Original Message --------
Subject: Re: [GreenKeys] Questions about some signals on the air.
Date: Sat, 26 May 2012 20:27:46 -0700
From: tony j. podrasky <tony.podrasky at gmail.com>
Reply-To: tony.podrasky at gmail.com
To: John Vendely <jvendely at cfl.rr.com>
References: <DBAAF8EB6D73495EBA85D9054F54F9FF at VALUED20606295> 
<4FC04E3B.4030604 at gmail.com> <4FC11B36.7080101 at cfl.rr.com>

Hey John;

That's it!

That's exactly what it does. I figured that out a while back
after listening to it and writing some stuff to decode it.

Every one else - now that I know it is a KG-84 I did a GOOGLE:

  http://mt-milcom.blogspot.com/2010/01/how-to-recognize-kg-84-encryption-in.html

UE,
W6ESE - tony
NNNN
ZCZC

John Vendely wrote:
> Tony,
> 
> If it's 75 baud, 850 shift, it is likely to be NATO STANAG-4481, which 
> is a 75 baud synchronous teleprinter system, virtually always with 
> online encryption using the KG-84.  When "phasing", the KG-84 sends a 
> sequence of mark/space reversals followed by a preamble which is easily 
> recognizable, then pseudorandom data.
> 
> If it's 50 baud, 250 shift, it could be the Russian Navy system known 
> colloquially as "36-50".  It's a specialized synchronous teleprinter 
> code that runs 50 baud, 250 shift, and occasionally idles at 36 baud.  
> It is virtually always encrypted, and frequently goes into "phasing" 
> sequences consisting of 50% duty cycle mark/space reversals.  It's an 
> old mode which is still in widespread use, with many ship and shore 
> stations on many frequencies throughout the HF range.  It is not baudot 
> code, of course, and cannot be copied on 50 baud baudot equipment.  I 
> have decoders here which will decode it, and have monitored these 
> stations on various occasions.  I've monitored 36-50 signals 
> periodically over the years, but have heard only a very few cases in 
> which they transmitted in the clear running test tapes, or with operator 
> chat (op-chat) about circuit setup.
> 
> There's essentially nothing to copy from either of these systems...
> 
> 73,
> 
> 
> John K9WT
> 
> On 5/25/2012 11:30 PM, tony j. podrasky wrote:
> 
>>Hello Richard et al;
>>
>>I haven't listened (right now) but I am assuming it is a signal that:
>>
>>o runs 850 Hz shift
>>
>>o sounds like about 35-66 WPM - but has a "stutter" where some pulses
>>    are slightly longer once and a while.
>>
>>o just before it drops carrier it goes into a 50% duty-cycle mark-space tone
>>    toggle for about 5 seconds.
>>
>>o then drops the carrier.
>>
>>o then comes back on and does it again.
>>
>>--
>>
>>I have chased this signal, found the identical transmission (using dual
>>receivers) on other frequencies. It is EXTREMELY strong where ever I
>>find it. And I've examined the signal with all the tricks I have at
>>my disposal and haven't been able to find rhyme nor reason of how
>>it works.
>>
>>I had researched all over GOOGLE and can not find anyone who can
>>give me any useful information about it.
>>
>>I'd pay up to ten kilobucks to be able to decode it - if the data
>>was of any interest.
>>
>>It REALLY, REALLY bugs me that it is so strong and I can't decode it.
>>
>>UE,
>>W6ESE - tony
>>NNNN
>>ZCZC
>>
>>
>>Richard Knoppow wrote:
>>
>>>      I am using MMTTY and receiving on an R-388.  AT about
>>>10.430 I find a very strong RTTY signal which seems to be
>>>there most of the time. I can't find any combination of
>>>settings that decodes into anything but nonsense.  What is
>>>this?  Is it encrypted and if not how do I go about
>>>receiving it.  I've run into other non-ham signals that are
>>>similar. Please forgive my ignorance.
>>>
>>>
>>>--
>>>Richard Knoppow
> 
> 
> 
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-- 
Tony J. Podrasky | This "telephone" has too many shortcomings to be
                  | seriously considered as a means of communication.
                  | The device is inherently of no value to us.
                  |                         -Western Union memo, 1877

-- 
Tony J. Podrasky | Even Popeye didn't eat his spinach
                  |    until he absolutely had to.