[GreenKeys] Western Union Model 32 Results

[Duncan M. Brown]

The tempest version of the Dovetron was supposed to go down to 1000Hz, the
only circuitry difference being the change of the pot from 2000 to 2500
ohms.  So adding 500 ohms or so in series with the Mark VFO pot should get
you down to 1070 for test purposes.

73 & have fun,

  --Duncan, K2OEQ


> [Original Message]
> From: Larry Tighe <larryradio at worldnet.att.net>
> To: <greenKeys at mailman.qth.net>
> Date: 20-Jul-08 15:33:00
> Subject: [GreenKeys] Western Union Model 32 Results
>
> Some results from playing with the W.U. modem;
>
> 1070 cycles is the idle tone from the tty or Mark
> 1270 cycles is the space tone when sending or rotary dialing
> 1830 cycles from the C.O. is the ringing and/or connect tone
>          to seize the machine turning it on.
>
> Am I correct in thinking every machine had different tones and therefore 
> could all be on a common "pair" just responding to their own unique tones?
>
> Unfortunately, the 1070 freq. is below the Dovetron's ability to tune for 
> Mark.  There doesn't seem to be any way to change the freqs.  Could be 
> unique to the printed circuit card in the box on the wall.  More
research. 
> Any input on this is appreciated.
>
> lar
>
>
> Larry
> www.antiquetelephone.com 
>
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