User's Manual

Rev. 02
CST38 User Manual
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REAR PANEL
7) CONNECTOR: antenna (N-F type connector).
8) CONNECTOR: modulation audio input (XLR3-F type connector).
The audio input line is transformer balanced and floating.
 pin 1 = ground;  pin 2 = AF-a input;  pin 3 = AF-b input.
9) - 6.3 mm, standard jack
type).
The transmission is allowed when the central pin (hot) is connected to external ring
(ground).
Note #1: in the standard version of CST 38, when the PTT plug is not inserted, the carrier
is still activated.
Instead, when the CST 38 is provided with the optional VOX 38  Voice Activated Circuit
board, the carrier is activated automatically only when the input audio-signal reaches the
activation-threshold pre-set in the VOX 38 board. However, the external PTT circuit (if
connected) can override the VOX 38 device and force the CST 38 in continuous
transmission.
10) CONNECTOR: dc power input (10.5 ÷ 16 Vdc).
( pin 1 = +Vdc,  pin 2 = ground).