With the VOX transmitter function, the transmitter will turn on whenever sounds of a certain loudness activate
it. Thus, it allows hand-off operations and you can listen as long as you want until you feel like talking, which will
activate the transmitter and be transmitted.
The speech processing function of a transmitter alters your voice as it travels into the microphone. The speech
processor isn't a voice scrambler, but it will trim the high and low frequencies off of your voice and allow it to be
more easily understood over the radio.
The attenuator was also used as an example at the beginning of this section. Its function is to reduce the
amount of signal that is received at the receiver. As a result, the attenuator function is handy if you are listening to a
radio station that is extremely close and/or powerful.
These forms of operation are all related to being able to transmit and receive at the same time. With simplex
operation, you can either receive or transmit. With duplex operation, you can transmit and receive at the same time
(usually via the use of split channels).
If you listen to the HF bands for extended periods of time, waiting for a station to appear, the background noise
could be very annoying. The squelch function is a headache preventer; it turns off the audio of the receiver until a
signal with sufficient strength turns the audio on.
39
The SGC Building, 13737 S.E. 26th St. Bellevue, Washington 98005 USA
P.O. Box 3526, 98009 Tel: (425) 746-6310 Fax: (425) 746-6384
© 1997 SGC Inc.
SPEECH PROCESSING
ATTENUATOR
SIMPLEX/DUPLEX OPERATION
SQUELCH
VOX (VOICE-ACTIVATED TRANSMITTER)
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