Care and Feeding of Telex Radio Dispatch Systems
C-6200 Setup
Phase 4 Design, Inc.
Dave Grant / dgrant@hostnw.net
425.402.7308
11/5/2010 Page 10 of 18
The C-6200 TX output circuitry has a DPDT relay that is used to connect and disconnect the TX
output transformer from the TX line based on PTT status. This allows a very large number of
consoles to be attached to the line in parallel, because only the transmitting unit will be directly
connected to the line. When not transmitting, the DPDT relay is connected to 600 ohms or open
circuit depending on the number of console connected in parallel to the line. If only one console is
attached, this unit should have J9 (Line 1) or J3 (Line 2) in the “A” position. This makes it the
effective master and terminates the line with 600 ohms. If there are more than one console connected
in parallel, one console should be designated as the master by placing J9 (Line 1) or J3 (Line 2) in
the “A” position and the remaining consoles should be designated as a slave and should have J9
(Line 1) or J3 (Line 2) placed in the “B” position. In this manner, the impedance looking back into
the parallel configuration of consoles is still 600 ohms.
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