[GreenKeys] Teletype on 4.004 Revisted

Mon Nov 25 20:35:50 EST 2013

here is another station with the same info at 8677.4 (close).  I can 
hear both the 4 mc and the 8 mc station simultaneously and matching the 
tones up makes it easy to duplicate what i'm hearing on either channel.

Larry
W0OGH

On 11/25/2013 5:34 PM, John Vendely wrote:
> I did DF the 5339 kc station a few years ago, though not with great 
> precision, and I don't recall the exact bearing.  However, the signal 
> I heard at that time was coming from southeast of my QTH on the Space 
> Coast of Florida (Brevard County, about 35 mi. south of Cape 
> Canaveral).  I didn't have any lines of bearing from any other 
> locations with which to triangulate, but that one LOB might suggest a 
> location in Mexico. I can recall only that the LOB was too far to the 
> south to be coming from within the U.S. unless it was on the southern 
> Gulf coast of Florida.
>
> It's true that for decades, the U.S. Navy had several HF transmitter 
> sites transmitting the Fleet Broadcasts on numerous frequencies to 
> various sectors of the world, and that these persisted as backups long 
> after the Fleet Broadcast had gone to satcom.  Perhaps some still 
> exist.  However, the U.S. Navy HF broadcasts were 75 baud, and this 
> station appears to be 50 baud.
>
> I could get an approximate LOB on the 14373.5 transmitter mentioned in 
> one of the posts, using the log periodic here.  If 4004, 5339, and 
> 14373.5 are indeed all carrying the same data, as suggested, this  
> might shed some light on things.  I don't currently have anything 
> capable of taking a decent bearing on the 4 and 5 Mc frequencies.
>
> Regarding the earlier posts mentioning older encryption gear like the 
> KG-84, some of these systems are still in use, in some cases in 
> modernized form.  For example, the Harris PRC-117G VHF/UHF manpack 
> transceiver contains a few of the older encryption systems, including 
> KG-84B.  These crypto units, once chunky pieces of standalone 
> hardware, can now be contained in a small section of an FPGA inside a 
> modern software-defined radio.
>
> There's little point in attempting to decode any of this stuff. 
> However, some, like the old KW-7 and the KG-84, have an easily 
> identifiable sync sequence.  Such systems can be identified if the 
> system occasionally re-syncs, but unless you have NSA-like 
> capabilities, you're not going to get anything decodable out of these 
> transmissions.  Upon rare occasion, however, some stations run test 
> sequences in the clear for troubleshooting purposes, and if you're 
> really patient and willing to collect huge quantities of data, these 
> can sometimes be observed.
>
> 73,
>
> John K9WT
>
> On 11/24/2013 11:37 PM, epvgk at limpoc.com wrote:
>> 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:
>>>
>
>
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