[GreenKeys] TTY Keying a CE 100V

[Larry Tighe]

Gene,

I hooked a polar relay in series with my loop to extract the data from the 
loop and apply it to my transmitter.  In my particular case, I key the AFSK 
oscillator in a Dovetron to get the AFSK into my audio input of the Sunair 
exciter.

In your case, I guess you just connect the closed circuit of the polar relay 
into the polar input.  A reminder, I had to supply the DC voltage required 
for biasing the polar relay so I used pieces of an ESU i.e., the power 
supply and the polar relay mount.  Too, I isolated completely the polar's 
contacts from the rest of the module.

Lar
----- Original Message ----- 
From: "Eugene Hertz" <ehertz at tcaf.org>
To: <greenkeys at mailman.qth.net>
Sent: Friday, April 21, 2006 11:35
Subject: [GreenKeys] TTY Keying a CE 100V


Hello all,

I am getting dangerously close to having my first station in operation 
having recently passed the general exam to get on HF.  I have teletype 
machines 28ASR and 28KSR in a loop with an ST6 providing loop current.

I would like to key my 100V from my TTY loop. I know the 100V has two 
inputs, FSK-1 and FSK-2 according to the manual, it mentions that FSK-1 is 
for use with a polar relay and FSK-2 is for use without a polar relay.

Can anyone give me a circuit diagram of how I can key the 100V with my 60ma 
TTY loop? One gentleman suggested that I need to use the loop to key either 
a relay or such, but I wonder why CE made two inputs with the distinction of 
what kind of relay to use for each if the end result was simply OOK (or 
short/open the FSK input contacts).

Anyone have experience running a tty loop with the 100V?
thanks in advance!

I have posted this same message on the following qth.net lists (sorry if you 
belong to all three): Central-electronics, greenkeys, boatanchors

See you on HF !
Eugene kc2nwg




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