[GreenKeys] Dovetron TTY speed converter

[Alf Fisher]

Hello Jack,
Yes I found the article on electronic speed control for RTTY machines.
Its the August 1974 issue starting at page 50 .
73
Alf
G3WSD

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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