User's Manual
Table Of Contents
CST38 User Manual
Rev. 02
6
OPTIONAL
VOX 38 - Voice Activated Circuit board
This device is useful to switch on automatically the carrier of the transmitter only when the
circuit is mounted on a printed-circuit
board, that has to be factory-mounted in the transmitter.
Once the modulation audio signal reaches the pre-set threshold, the transmitter is
activated.
When the modulating audio signal is not more present, the carrier is switched off again,
after a pre-set delay time. Consequently the relevant MicroEar receiver is muted by its
built-in squelch circuit, preventing the listening of unwanted noise.
Two pre-setting values can be adjiusted by means of relevant screwdriver-trimmers
situated on the printed-
VOX 38 board, mounted
on the CST 38 main board