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When responding to calls in the scan mode, the 
programming of the Talkback Scan parameter deter-
mines if a response always occurs on the talk group 
of the call (Active Group) or the Selected Group if 
they are different. Transmissions at other times 
always occur on the selected talk group.

•

Each talk group can be programmed to select one of 
the programmed scan lists or “No List” (scanning is 
disabled). If scanning is enabled and the selected 
channel does not permit scanning, it is automatically 
enabled again when a channel is selected that 
permits scanning.

•

Up to 256 scan lists, each with up to 256 talk groups 
from the same system can be programmed. The 
selected scan list can be temporarily changed as 
described in Section 4.9.4 and edited as described in 
Section 4.9.5.

•

In addition to calls on channels in the scan list, 
pages, private/unit calls, and telephone* calls are 
received while scanning. Private and telephone calls 
are not interrupted by priority messages. 

6.12.2  PRIORITY TALK GROUP SAMPLING

One talk group in the scan list can be designated a 

priority talk group by programming or it can be the 
selected talk group. When scanning, messages on a 
non-priority talk group are interrupted by messages on 
the priority talk group. Priority scanning must also be 
supported at the system level for it to occur as 
programmed in the radio. 

The dynamic regrouping feature allows a 

dispatcher to change the current talk group or switch 
mobiles to a predefined regrouping channel to receive 
an important message. When the console issues a 
regroup order, the transceiver switches to the prepro-
grammed regroup talk group. If the lock mode was not 
specified, the selected talk group can be manually 
changed and the previous talk group is reselected if 
power is cycled. If a locked regroup command is 
received, the displayed talk group cannot be changed 
manually or by cycling power. It can be changed only 
after a clear order is received from the console. 

Dynamic regrouping operates as follows:

1. When this command is received, alternating tones 

sound and the transceiver automatically changes to 
the regrouping channel and “DYN REGRP” is 
displayed. 

2. Manually select the channel corresponding to that 

alias. If this is not done, transmission still occurs on 
the new channel, but the alternating tones sound 
each time the PTT switch is pressed.

3. Talk and listen as usual. The dispatcher cancels 

dynamic regrouping which is indicated by a short 
tone. If a standard channel is not selected after this 
occurs, transmission is not allowed if the talk group 
is assigned as a dynamic regrouping talk group only. 
If it is assigned as a normal talk group, normal trans-
missions are allowed. 

6.14.1  INTRODUCTION

As described in Section 3.8.3, the SmartZone

®

 

mode provides wide area coverage by allowing 
roaming between SMARTNET and conventional sites. 
The P25 Trunked mode can provide access to a single 
trunked site or roaming between several trunked sites. 
Operation in these modes is the same as just described 
in the preceding sections (6.1-6.13) with the following additional features:

6.14.2  BUSY OVERRIDE

The busy override feature is enabled at the system 

level by the system manager and is not a program-
mable radio feature. It allows a call to be placed even 
if not all sites you are calling have a free traffic 
channel. The only sites guaranteed to be included are 
the Critical Sites and the sites where a Critical User is 
located. This feature operates as follows:

1. Assume that you have attempted to place a call and 

the system was busy (“BUSY” displayed and busy 
tone sounded). 

2. Release the PTT switch and then press it for 5 

seconds or more. If a chirp tone sounds with the PTT 
switch pressed, busy override is occurring.