[GreenKeys] W.U. F1/F2 Telex sub-set

[Jack]

Kevin,

I'm guessing it might be a WU version of a Bell 103 type modem. It should
use the standard Bell tones (the modem works in full duplex, with one
set of tones transmitting while it can receive the other set of tones
from the other end. I believe the tones were 2025/2225 and 1070/1270
- 200 HZ shift).  The calling modem has to be in the "originate" mode and
the answering modem in the "answer" mode for the tones to work.
That rotary switch might be used for loopback testing.

73,
Jack K2TTY



-----Original Message-----
From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Kevin H. Phillips
Sent: Monday, January 8, 2018 1:35 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] W.U. F1/F2 Telex sub-set

I need some help with a "mystery" piece of equipment I have.  I have two or three of them that came with Model 32 Telex machines I acquired from different sources.  I will try to attach photos of it.  Ken Gartland has kindly given me a lot of information and Wayne has been giving me great advice, as usual, trying to get a 32 working for i-Telex.  This apparently was a "modem like device" used to send Telex signals over regular telephone lines after DC loop lines were discontinued.  The device has AC power, a 3-wire cable that connects to Terminals 8 & 9 (the loop connections) on the back of the Model 32 call unit, plus Ground, also a 4-wire telephone-type cable with modular connector on one end.  The thought is that these were activated (if that's the right
term) by frequency sets from one end of the line.  What I am thinking of doing is trying to use one, or more, of these devices to test my 32's to see if they will work for i-Telex.


Here are some of the questions I have:

1.  What were the frequencies of the tones used?


2.  Are the tones shifted or constant?


3.  Can I use a computer to generate the tones?


4.  Can I use AFSK tone generators on some of my T.U. equipment such as the HAL ST-6000 or 8000?


5.  Could I connect two of the devices back to back, or with machines on 
either end, to simulate sending/receiving Telex messages?


I hope these questions are phrased understandably.


Thanks,


Kevin Phillips

W5TTY



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