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2.6.6 CONVENTIONAL MODE SCANNING
As with LTR mode scanning, if a conventional
system is selected with roaming disabled, only
conventional and LTR systems in the scan list are
scanned. LTR-Net systems are not scanned. If roaming
is enabled, only LTR-Net systems are scanned if an
LTR-Net locality is detected (see Section 2.6.4).
Each conventional system selects a radio channel,
each system is scanned in order. Call Guard squelch is
detected if the monitor mode is disabled (see Section
2.11.2). If the monitor mode is enabled, all calls occur-
ring on the channel are received.
A feature called Adaptive Tone Scan (ATS) is
used when scanning conventional channels. If no
carrier is detected, the channel is scanned for only 40
ms. If a carrier is detected, searching for Call Guard
signaling occurs (if programmed). If the tone type of
Call Guard squelch is programmed, the channel is
monitored for 180-420 ms. The shorter time is when
the tone is outside certain limits, and the longer time is
if it is at or near the programmed value. If digital type
is programmed, approximately 350 ms is required to
determine an invalid code (less time is usually
required to detect valid codes).
2.6.7 SCAN LIST PROGRAMMING
General
NOTE: The selected (displayed) system and group are
always scanned, even if they have been deleted from
the scan list.
NOTE: Deleting LTR-Net systems from the scan list
also deletes them from locality searching when
roaming, even if scanning is disabled (see Section
2.9.4).
The scan list status of the displayed system is
changed by pressing FCN S.A/D, and the scan list
status of the displayed group is changed by pressing
FCN G.A/D. The displayed system is in the scan list
and scanned normally when
displayed group is scanned when
illustration in Section 2.6.2).
is displayed, and the
is displayed (see
2-15
Deleting a system only temporarily deletes the
groups associated with that system because when a
system is added back into the scan list, the original
group scan list is again active. Scan lists can be
programmed even when scanning is disabled and
while listening to a message. If a system or group is
deleted while listening to a message, scanning resumes
after the receive delay time expires (if applicable).
2.6.8 SAVING SCAN LIST
If the menu mode SCN SAVE parameter is
enabled (see Section 2.5.2), the user can select if scan
list changes are saved or not saved. If "On" is selected,
changes are saved as they are made and the scan list
does not change when power is turned off. Conversely,
if "Off" is selected, they are not saved and the default
scan list status of all systems and groups is reselected
when power is turned on. If the menu SCN SAVE
parameter is not selectable, the scan list save mode is
fixed in the default mode selected by programming.
2.6.9 SCAN DELAY AND CONTINUE TIMERS
Receive Delay
When a message is received while scanning, there
is a programmable delay of 0-7 seconds before scan-
ning resumes. This delay is called the Receive Delay
Time, and it prevents scanning from resuming or a
message on some other system or group from being
received before a response can be made . This delay is
also in effect if a control is changed while scanning
such as selecting another system/group. This timer is
reset each time another call is received.
NOTE: Scanning does not resume if it is disabled,
such as by selecting the monitor mode.
Call Delay Time
The receive delay time controls the scan delay
until the transmitter is keyed and then the Call Delay
Time controls the delay. This time is programmable
for 0-7 seconds, and it ensures that a response to your
message is heard instead of some other message occur-
ring on another system/group. The Call Delay Timer
remains active for the remainder of the conversation,
and controls when normal scanning resumes, even if
additional responses are received.
OPERATION
November 2001
Part No. 001-7240-001
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