Computer Automation Technology

Positive Current Transmitter PTT

All CAT controllers key the transmitter by grounding the PTT line. However some transmitters require a positive DC voltage to key. In these cases, a switching device must be installed between the transmitter and the controller's push to talk output. Use caution when connecting an external PTT drive device to your controller.

Note: To prevent damage to the PTT integrated circuit, do not apply +12VDC directly to pin 10 on your controller.

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