[GreenKeys] Speed Converters

[telegrapher at att.net]

SOunds like Hoff's UT-4.  Had all those features and the analog meter to 
tell you when the FIFO's were approaching 80 characters at which time it 
would start to garble the output.  I had a very nice one that along with 
the ST-6 i acquired from a fellow in Texas in the mid to late 70's.  I 
think it's now up in SOuth Dakota.  Great little unit.  Speed conversion 
up/down as well.

larry
W0OGH


jhhaynes at earthlink.net wrote:

> 
> 
> 
> jhhaynes at earthlink dot net
> 
> 
> n Wed, 14 Jun 2006, Keith Densmore wrote:
> 
>> Hi Y'all
>> Back around 1980 ASCII  to baudot (and vica versa) speed converters 
>> were common. Some were built into the FSK converter and some were 
>> seperate. Does anyone have one of the  seperate units either homebrew 
>> or commercial or a construction article about the same.
>>
>> Thanks,
>> Keith, VE3TS
> 
> Just recently Jack had a Black Box speed and code converter on sale on 
> ebay.
> 
> Back in the 70's or so there was a design for a box that used FIFO
> integrated circuits so you could run your Model 28 at 100 WPM and
> use it in amateur RTTY at 60 WPM.  I often advocate this to people
> looking for 60 speed gears for their Model 28s, as it is more
> impressive to the public to be able to run the 28 at full speed
> 100 WPM and then for radio use the speed converter takes care of
> things.  Plus the speed converter acts as a regenerative repeater,
> and that is advantageous especially in radio reception.
> 
> Receiving of course is easy since the printer at 100 WPM stays ahead
> of the data stream at 60.  It's for transmission that you need the
> FIFO buffer since the keyboard is running faster than the radio can
> transmit the characters.  The box I'm thinking of had an analog
> meter on it to show you how full the buffer was getting, so you
> would not overflow it if you could type that fast.
> 
> I guess the modern way to do this would be to use Gil's circuit board
> and a microcontroller, rather than FIFO chips.
> 
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