54
Tone Encode Transmission
In conventional mode two keys can be defined to be tone encode triggers. If
either one of the pre-programmed tone encode triggers is pressed, a pre-
programmed tone sequence will be transmitted on the current system and
channel. (See
Emergency Operation
if
E
key is used.) The
TX
indicator
will light during tone transmission and a beep will sound at the end of the
transmission. If enabled, audible side tones will be heard in the radio speaker
as well. If PTT is pre-programmed as one of the triggers, the microphone will
become active for voice communication after the tone sequence is complete.
Tone encode will be transmitted with Channel Guard if one is defined, and
tones are always transmitted in clear voice mode, even if the channel is set for
digital or private (see
VOICE MODES
). Digital or private voice transmission
will resume normally after the tone transmission.
SCANNING CONVENTIONAL CHANNELS
Channels that have been previously added to the scan list, on a per system
basis, may be scanned. The selected channel is scanned (if enabled through
programming) whether or not it is in the scan list. Each conventional system's
channel scan list is retained in memory when the radio is turned OFF.
The scan rate will vary depending upon the number of channels in the scan list
and whether or not the radio is programmed to scan for channels with
decoding enabled. Fewer channels will result in a faster scan rate. If
programmed for dual-priority scan operation, the priority-one, priority-two
and the remaining scan list channels are scanned. Once a signal is detected
and the correct encoded squelch signal is decoded (if programmed), the radio
receives the message and displays the received scan channel. At the same
time, scanning continues on the priority-one and priority-two channels. Should
the priority-one or priority-two channel carrier, regardless of encoded squelch
decoding, be detected while a non-priority channel is being received, the
display name is updated and the received channel is switched to the priority
channel. Scanning of the priority-one channel will continue if a message is
being received on the priority-two channel.
While receiving a call on a non-priority or a priority two channel, the radio
periodically checks the priority one and two channels. If Scan with Channel
Guard is enabled, the radio will use Channel Guard to decide whether to un-
mute on a priority channel. The radio will stop, on squelch detection, on a
priority channel. In normal operation, the radio will un-mute only on detecting
the correct Channel Guard; otherwise, it will remain muted until the priority
channel call and hang time have ended. An optional feature allows the radio to
continue scanning upon the detection of the wrong Channel Guard on a
priority channel. The user can then select the rate this channel is scanned until
the call there ends.
Содержание Orion
Страница 1: ...Operator s Manual LBI 38888 Rev N Mar 05 Orion Mobile Radio ...
Страница 79: ...NOTES 79 ...
