[GreenKeys] Kleinschmidt tuning fork at Fair

[Duncan M. Brown]

John,

Teletypewriters (both Teletype Corp & Kleinschmidt) used in military
tactical operations were designed to operate from local power sources,
(such as generators) that might not be well regulated. A series-governed
motor was used that could be adjusted for the proper speed. (Even though
TTY is a non-synchronous system, the motor speeds of all units in a network
need to be fairly close for optimum operation.)  For fixed station
operation, a synchonous motor keeps the TTY machine locked to the 60 cycle
line.

The series-governed motor has a disk on one end that has dots painted on
it. You look at the dots through a slot in the vibrating tuning fork and
adjust the motor speed until the dots stop moving.  

The vibration rate of the tuning fork must be a fraction of the motor
speed, so a KLI tunning fork won't work with a Teletype Corp. machine and
vice versa.  But the 180 vps tunning fork will work on all KLI machines.

73 & have fun,

Duncan Brown, K2OEQ
USASA  31J

Chief TTY operator & repairman
AWA Electronic Communication Museum
http://www.antiquewireless.org/






> [Original Message]
> From: John Hensley <w5jv at hotmail.com>
> To: <greenkeys at mailman.qth.net>
> Date: 20-Sep-09 12:54:16
> Subject: [GreenKeys] Kleinschmidt tuning fork at Fair
>
>
> Looks like Fair Radio has some tuning forks in for the Kleinschmidt
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350253679198
> How exactly were these used ??
> _______________________________________________________________