[GreenKeys] TTY word counter

[Richard Knoppow]

     I am showing my ignorance but I assume the boxes with a dial that 
looks like a timer one sees on M19 machines is a character counter or 
something of the sort so that someone punching a tape knows when to 
insert carriage returns and line feeds.

On 4/12/2016 6:35 PM, Jim Haynes wrote:
> That's interesting.  I'm sure Teletype had some word counters in the
> product line, but they probably counted actual spaces and newlines
> rather than just all characters.  But then they counted words from the
> keyboard and this thing presumably counts words from incoming traffic.
>
> I see it uses the oscillator-transformer-detector scheme that was more
> or less the standard way to get DC isolation of the TTY loop before
> we had those wonderful opto-couplers.  In even earlier times there
> was an isolator consisting of a gas discharge tube surrounded by an
> electromagnet carrying the loop current.  The magnetic field from
> loop current would disrupt electron paths so they couldn't get from
> cathode to anode of the gas discharge tube.
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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