Uniden Br330t Wideband Trunktracker Scanner Owners Manual

21
Understanding Scanning
units which transmit the correct tone along with their 
signal can “talk” to the repeater.
CTCSS and DCS are also used in areas that receive 
interference where there are several stations with 
output frequencies close to each other. When this 
occurs, you might hear multiple communications on 
the same frequency. The stations might even interfere 
with each other to the point where it is impossible to 
clearly receive any of the stations. A scanner 
equipped with CTCSS and DCS...

22
Conventional Scanning
Conventional scanning is a relatively simple concept. 
Each group of users in a conventional system is 
assigned a single frequency (for simplex systems) or 
two frequencies (for repeater systems). Any time one 
of them transmits, their transmission always goes out 
on the same frequency. Up until the late 1980s, this 
was the primary way that radio systems operated. 
Even today, there are many 2-way radio users who 
operate using a conventional system: 
•Aircraft
• Amateur radio...

23
Understanding Scanning
Simplex Operation
Simplex systems use a single frequency for both 
transmit and receive. Most radios using this type of 
operation are limited to line-of-sight operation. This 
type of radio is frequently used at construction job 
sites, and with inexpensive consumer radios such as 
GMRS/FRS radios. The range is typically 1-8 miles, 
depending upon the terrain and many other factors. 
Repeater Operation
Repeater systems use two frequencies: one transmits 
from the radio to a...

24
What is Trunk Tracking?
Your BR330T is designed to track the following types 
of trunking systems.
• Motorola Type I, Type II, Type IIi hybrid, 
SMARTNET, and PRIVACYPLUS analog trunking 
systems, which are extensively used in 800 MHz 
communication systems. 
• LTR trunking systems
• EDACS SCAT trunking systems
• EDACS trunking systems
When tracking these types of systems, you might want 
to remember that your scanner can track more than 
one trunking system at a time and scan conventional 
and...

25
Understanding Scanning
full, so new users were not able to take advantage of 
the technology as quickly as they wanted. 
Trunking solved this frequency shortage by allowing 
multiple groups to use the same set of frequencies in a 
very efficient way. While each type of trunking system 
operates a little differently (see the next few sections), 
they all work on the same basic premise: even in a 
system with a lot of users, only a few users are ever 
transmitting at any one time. 
Instead of being...

26
Types of Trunking Systems
Trunking systems divide a few frequencies among 
many different users, but the way that each system 
does this is slightly different. This section describes 
some of the technical data behind Motorola, EDACS, 
and LTR trunked radio systems.
Motorola Trunking
While there are different types of Motorola trunking 
systems, they all use the same basic trunking method. 
The system consists of one control channel (or as 
many as 4 per system but only one is active at any 
one...

27
Understanding Scanning
subfleet talk groups; instead they use a 5-digit ID for 
each talk group. 
Type IIi Hybrid — these systems support a mix of both 
Type I and Type II users. Like Type I systems, you 
must know the system’s fleet map to ensure proper 
tracking.
EDACS Trunking
EDACS trunking works in much the same way as 
Motorola trunking with a couple of major differences.
In an EDACS system, each frequency used by the 
system is assigned a Logical Channel Number (LCN) 
so that less data needs to...

2801-062. 01 identifies the agency as the police 
department, 06 identifies the fleet as the West district, 
and 2 identifies the subfleet as the dispatch channel. 
While these assignments are somewhat arbitrary and 
vary from system to system, there are many resources 
on the web for finding the assignments for most 
systems. Because of the logical hierarchy of the AFS 
system, your BR330T lets you assign wildcard ID’s 
that let you, for example, use only one ID memory to 
identify all units in either...

29
Understanding Scanning
the LTR data matches a talk group ID that you have 
stored in the talk group ID list and have not locked out. 
LTR systems are frequently programmed so that each 
radio has a unique user ID.
I-Call (Motorola/EDACS)
I-calls are direct unit-to-unit transmissions that are not 
heard by other system users. Your BR330T can 
receive I-call transmissions. See “Setting I-Call 
(Motorola and EDACS Systems Only)” on Page 85 for 
more information about monitoring I-call transmissions....

30•http://svartifoss2.fcc.gov/reports/index.cfm 
*
 - 
conventional frequency information on file with the 
US Government
•http://groups.yahoo.com/group/BR330T 
* - a 
group for people interested in discussing the 
BR330T.
* - These web sites are not affiliated with Uniden 
Corporation.