[GreenKeys] Northern radio tone keyer type 153 model 2

[Tom Dawson]

Those were 85 Hz Shift and were used in Frequency Division Multiplex TTY 
links.  The Plug in also contained the frequency sensitive parts of the 
discriminator.

73

Tom
WB3AKD
----- Original Message ----- 
From: "John D. Kopke" <jdkopke at cablespeed.com>
To: <greenkeys at mailman.qth.net>
Sent: Friday, April 24, 2009 4:20 PM
Subject: [GreenKeys] Northern radio tone keyer type 153 model 2


> What shift do these normally operate at ? Would it be possible to build 
> the filters
> if they were not  available? Thanks
>
>
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>