User's Manual

Table 5 – Transmit/Receive Mode Compatibility

for Aegis/ProVoice Operation

GROUP/CHANNEL

PROGRAMMING

(TRANSMIT)

CLEAR

RECEIVE

DIGITAL

RECEIVE

PRIVATE

RECEIVE

CLEAR Yes No No

DIGITAL Yes Yes No

PRIVATE Yes No Yes

NOTE

Conventional Aegis or encrypted channels require Channel

Guard on the channel to operate correctly.

Clear Modes

Aegis clear and ProVoice clear modes are identical voice modes 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

easily be monitored by unauthorized persons. Groups or channels

programmed for clear operation cannot transmit or receive unencrypted digital

or private messages.

Aegis/ProVoice Digital Mode

Aegis/ProVoice digital mode allows the radio to transmit and receive digitized

voice signals. These digital signals provide improved weak signal

performance and they cannot be easily monitored with a standard receiver.

Groups and channels programmed for Aegis or ProVoice digital operation

transmit only digital signals. Private calls cannot be received or transmitted

when the radio is in the Aegis or ProVoice digital mode because the radio

does not know the cryptographic key used.

Message trunked group calls and individual calls will be answered back in the

mode they were received, assuming the call or hang time is still active.

Individual, phone, all and emergency calls will be transmitted clear if digital

mode is disabled or inoperative.

1. If receiving an analog message trunked call, the radio will respond in

analog mode during the hang time on the working channel.

2. If receiving an analog I-Call, the radio will respond in 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 will be transmitted in the mode defined by the system

mode as programmed for the current system if the ID being called is not in