User Manual

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If a secure call is in progress elsewhere and the user has not logged in, the
bottom of the dwell display will alternate between “No Access” and the alias
of the radio that is currently engaged in the secure call.
3.12.2 Manual Encryption
Two or more users can manually encrypt a call, if enabled, without an
established encrypted talk group. A pre-determined key and a DTMF
microphone are required at each radio.
NOTE
The key must be pre-determined by the users prior to
making a manually encrypted call on a talk group. It can
be between one and sixteen (1 - 16) digits and it is entered
into the radio using the keypad on the DTMF microphone.
If two communicating radios have different (manually-
defined) keys, receive audio at each radio will sound
garbled.
With manual encryption enabled, unencrypted radio users on the talk group
can still make standard voice (unencrypted) calls on the talk group. However,
if a unencrypted user attempts to transmit on the talk group when one of the
encrypted users is already transmitting on the talk group, the unencrypted
radio will sound a deny tone and “No Access” will appear in the display. Also,
the encrypted user can hear standard unencrypted calls, but cannot respond
while still manually encrypted.
CAUTION
Do not set a talk group for manual encryption if it has
been set for encryption by the network administration
personnel.
Perform the following to transmit or receive manually encrypted calls:
1. Press *32 on the DTMF microphone keypad.
2. Enter the key (up to 16 digits).
3. Press the # key.
NOTE
Due to inherent qualities of the DTMF microphone, there
is a two (2) second delay between entering the encryption
key and manual encryption feature taking affect.
4. To end manual encryption, press *33#.
If a user is engaged in a call on a talk group that has been manually encrypted
at the radio level, the user will see “Secure Call” on the bottom of the dwell
display.