[GreenKeys] Dovetron TTY speed converter

[joeduerbusch]

I have a Dovetron TSC-1000 Speed Controller with manual if anyone can use
it.  It was used with a Model 43 ASR back in the day.
It is nice and clean, could pass for new.  But it has been 20 years or more
since it was used last.

Joe K0BX


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On Fri, Dec 18, 2015 at 9:59 PM, Jack <wa2hwj at att.net> wrote:

> ZCZC
>
>
>
> Great find, Nick.
>
>
>
> There was an article in Ham Radio magazine in the 70’s that described
>
> a speed control for a governed motor TTY. I believe it was a Kleinschmidt
>
> TT-98. It required the construction of an optical encoder “wheel”.
>
>
>
> Another simple way to control speed is a variation of the UT-2 UART-based
>
> speed converter. This simple version doesn’t need any FIFO buffering if
>
> the speed is always being “up-converted”.  The TTY is a set for 100 WPM
>
> and the converter up-converts 60-66-75 wpm thru the UART.
>
> If speed conversion is needed both ways, then buffering is needed.
>
> The Flesher TS-128 provided that type of conversion as does the
>
> “fully-loaded” Dovetrons. Some of the Tempest Dovetrons can
>
> up-convert.
>
>
>
> Some Model 28 RO military TTY’s came with the LMU-10 governed
>
> motor that could be mechanically adjusted for different speeds. This
>
> version had a tachometer on the motor hooked to a calibrated meter so
>
> the speed could be “dialed in”.
>
>
>
> Jack K2TTY
>
>
>
> NNNN
>
>
>
>
>
> *From:* GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] *On Behalf
> Of *Nick England
> *Sent:* Friday, December 18, 2015 2:49 PM
> *To:* Greenkeys <greenkeys at mailman.qth.net>
> *Subject:* [GreenKeys] Dovetron TTY speed converter
>
>
>
> I just came across and scanned a Dovetron TSC-1000 Speed Controller manual
> (just a few pages and schematics actually).
> http://www.navy-radio.com/manuals/tty/dovetron-tsc1000-spd_cntlr.pdf
>
> Perhaps of interest to folks in the recent discussion about running 45.5
> baud machines at 50 baud. It is an AC>DC>AC gadget for changing the
> frequency and voltage feeding your synchronous TTY motor.
>
> FWIW the original manual is now available FTGH.
>
> Cheers,
>
> Nick England K4NYW
>
> www.navy-radio.com
>
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