[GreenKeys] Teletype on 4.004 Revisted

[Richard Knoppow]

----- Original Message ----- 
From: "Jim Haynes" <jhhaynes at earthlink.net>
To: <NNN7DXB at aol.com>
Cc: <greenkeys at mailman.qth.net>
Sent: Sunday, November 24, 2013 9:30 AM
Subject: Re: [GreenKeys] Teletype on 4.004 Revisted


> My understanding is that modern crypto equipment emits a 
> continuous stream
> of random-looking bits and they keep it up regardless of 
> whether there
> is traffic, so as to foil traffic analysis.
>
> When the transmission starts at precisely 5PM it may be 
> running in
> parallel with transmission on another frequency used 
> during the daytime,
> so the receiver can switch frequencies without a break in 
> traffic.
>
> jhhaynes at earthlink dot net

     I hear those same signals in Los Angeles.  I think I've 
also heard them on other frequencies, for instance near 8 
mhz but didn't make any notes. Same thing here trying MMTTY 
both A and D and some other programs, it _sounds_ like 
regular RTTY but isn't. It decodes (if I can use that term) 
to nonsense. If this is encrypted military traffic it would 
be interesting to know who is using it and why. Evidently 
plain old HF has some advantage over satellite for somebody. 
Goes along with the "counters".


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com