[GreenKeys] GreenKeys Digest, Vol 72, Issue 6

[Gary Buda]

IT has been years since I've been on RTTY.  I kinda soured on it because of 
all the glass tube operators and their inability(read that unwillingness) to 
limit the line length and software vendors who assume everyone is on glass 
tube RTTY and don't even have a way for their software to do an auto CR/LF to 
accommodate those of us who prefer the mechanical machines.  I suppose I could 
figure out how to set up my stunt box to automatically do CR/LF but I haven't 
bothered yet. 

Gary WA0NDN
NNNN

On Monday 04 January 2010 11:00:22 am greenkeys-request at mailman.qth.net wrote:
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> Today's Topics:
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>    1. Re: SB-2244 TTY patch panel (Bill Horne)
>    2. QSO's (Teletypeparts at aol.com)
>    3. ASR-33 70 (Dave Hunter)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 03 Jan 2010 12:44:18 -0500
> From: Bill Horne <ehorne at speakeasy.net>
> Subject: Re: [GreenKeys] SB-2244 TTY patch panel
> To: greenkeys at mailman.qth.net
> Message-ID: <4B40D772.5060004 at speakeasy.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I think it's just a throttling mechanism to slow the machines down while
> the rotors align in the crypto gear.
>
> Bill, W1AC
>
> On 1/3/2010 11:52 AM, Brooke Clarke wrote:
> > Hi:
> >
> > It may be related to TEMPEST.  A mechanical TTY machine generates RF
> > signals at each on or off transition.  If a bunch of machines are
> > synchronized so they all have a transition at the same time then their
> > TEMPEST emanations may get mixed up.
> >
> > Have Fun,
> >
> > Brooke Clarke
> > http://www.PRC68.com
> >
> > Jim Haynes wrote:
> >> Some implementations of Teletype with crypto equipment required that the
> >> stepping the Teletype keyboard or tape reader at a fixed rate.  In the
> >> Model 28 parts books you'll see mod kits to adapt things for
> >> "synchronous pulsed operation".  A large station might have a TD stepper
> >> facility consisting of a baud rate generator and then a bunch of boxes
> >> that send out TD stepping pulses to all the TDs.
> >>
> >> I don't know why it was this way.  I don't have any first-hand knowledge
> >> of crypto equipment, but I did once buy some TD stepping equipment at
> >> a surplus sale.
> >>
> >> Where this is done each TD or keyboard has to have its usual loop and
> >> then a loop for the stepping pulses.  So I'm guessing what you have
> >> provides for switching both the signal and the stepping pulses.
> >>
> >>
> >>
> >> jhhaynes at earthlink dot net
> >>
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