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Figure 10-3: Information Display
10.12 DIGITAL VOICE OPERATION
Digital voice programmed systems have three (3) different voice modes: clear (analog), digital, and
private (encrypted). The voice modes are programmed on a per-group basis within each trunked system
and on a per-channel basis within each conventional system.
10.12.1 Clear Mode
The Clear Mode is a voice mode in which the radio transmits and receives only clear (analog) voice
signals. These analog signals are non-digitized and non-encrypted. Clear mode transmissions can be
monitored easily by unauthorized persons.
Groups or channels programmed for clear operation cannot transmit or receive digital or
private messages.
10.12.2 Digital Mode
The Digital Mode allows the radio to transmit and receive digitized voice signals. Digital signals provide
improved weak signal performance and cannot be easily monitored with a standard receiver. Groups and
channels programmed for digital operation transmit only digital signals. Message trunked group calls and
individual phone calls (I-Calls) are answered back in the mode in which they were received assuming the
call or hang time is still active. Individual phone, all call, and emergency calls are transmitted clear if the
digital mode is disabled or inoperative.
1. If receiving an analog message trunked call, the radio responds in the analog mode during the hang
time on the working channel.
2. If receiving an analog I-Call, the radio responds in the analog mode during the hang time.
3. When using the *WHC* feature to respond to an I-Call (after the hang time has expired), the call is
transmitted in the mode defined by the system mode as programmed for the current system if the ID
being called is not in the I-Call list. If the ID is in the I-Call list, then the call is transmitted as defined
by the I-Call mode programmed in the list for that ID.
The overdial DTMF tones are not available while in the Digital Mode.
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