Uniden Bc250d Widenband Scanner Owners Manual

EDACS systems often provide users with an Emergency
mode on their radios. Users in trouble can alert the dispatcher
and other units and get priority access to the radio system.
When a user activates Emergency mode, EMERGENCYwill
flash the display during the entire transmission. At the
beginning of each transmission it will sound a distinctive
emergency alert tone three times. To turn Emergency Alert
ON/OFF, enter into the Menu mode. Select 2:SCAN
OPTION/ 2:TRUNK- select Bank number -
9:EMERGENCY  ALT/...

LT R®Reception
LT R®Tracking
LTR®(Logic Trunked Radio) systems are trunking systems
used primarily by business or private communications service
providers, such as taxicabs, delivery trucks, and repair
services. These systems encode all trunking information as
digital subaudible data that accompanies each transmission.
Users on an LTR system are assigned to specific talkgroups,
which are identified by the radio as six digit numbers. 
These numbers are in the form AHHUUU, where:
A= Area code (0 or 1)
H=...

Motorola Reception
Motorola Tracking
There are really two types of Motorola trunking systems.
These are usually referred to as Type I and Type II systems.
Type I only occurs on some 800 MHz systems. All VHF, UHF
and 900 MHz trunking systems use Type II.
One important distinction between these two systems is the
amount of data transmitted by each radio when its push-to-
talk button (PTT) is pressed. Every radio in a trunked system
is assigned a unique ID so the central site computer can
identify it when...

systems usually accommodate fewer users than Type II
systems.
Even though there are many Type II systems, Type I systems
are still in use. There are also Hybrid systems which are a
combination of both Type I and Type II. Your scanner defaults
to monitor Type II systems, but its possible to select a
Preprogrammed Fleet Map or create a Custom Fleet Map for
your area.
For VHF and UHF Type II trunking systems, you will need to
know the base, spacing frequencies and offset channels. 
See page 72 for details....

Note: You will now begin to see Type I Fleet-Subfleet IDs.
For example, 100-12, 100-9, 000-12, 400-8, etc. 
See User Defined Fleet Maps in the Appendix for
more information about Type I IDs.
How do you know if the preset map is correct? You will have
to listen to see if youre following complete conversations. 
If not, you should try another preset map.
Programming a Fleet Map
You may want to read User Defined Fleet Maps in the
Appendix before programming a Fleet Map. It contains a
detailed explanation of...

Setting the Base, Spacing Frequencies and
Offset Channel for Motorola
VHF/UHF Trunked Systems
To properly track Motorola VHF and UHF trunked systems
you must enter what is known as the base, the spacing
frequencies and offset channels for each system.
To find these out, check the scanner.uniden.comor
www.bearcat1.com/free.htmand other web sites and
frequency resources.
To enter the Base, Spacing Frequencies and Offset Channel:
(You can set up to three sets of these, but almost all systems
only use one...

73
Note:•If the system is not tracking properly, you may need
to try a new Base Frequency or Offset Channel or
you may be missing frequencies from the system.
•You can set up to three Base, Spacing and Offsets
for Motorola VHF/UHF trunked systems.
Toggling the Status Bit
On Type II trunking systems there is a method by which
specialized types of communications utilize unique talkgroup
numbers. An emergency call will occur on a unique talkgroup
from its primary assignment, for example. Because the
BC250D...

PLAN 2: If the last three digits of frequencies are less than
869.0000 and end in one of the following three digits (125,
375, 625, or 875) and if ANY other frequencies end in (000,
250, 500, or 750) use Plan 2.
PLAN 3: If the last three digits of ALL the frequencies in
use end in one of the following three digits (000, 250, 500,
or 750) use Plan 3.
PLAN 4: If the last three digits of frequencies are less than
866.0000 and end in one of the following three digits (000,
250, 500, or 750) and if ANY other...

75
Disconnect Tone Detect Option (End Code)
When this function is disabled, the radio looks for squelch
before returning to the Control Channel instead of waiting for
the Disconnect Tone. Only in rare instances will you need to
adjust the default settings.
The condition to return to Control Channels depends on
whether the signal is present or not.
To set this function to ON / OFF, select 2:SCAN  OPTION
/ 2:TRUNK- select bank number - / 0:END  CODE.
Select 1:DETECTor 2:IGNORE.
BC250D  11/6/2 11:37 AM...

APCO Project 25
Reception
APCO Project 25 is a modulation process where voice
communications are  converted into digital communications.
This conversion is similar to the technology used with digital
mobile phones. There are several types of Project 25 systems
available! Systems the Uniden BC250D supports are listed
below.
- Conventional – one frequency with digital voice.
- Trunked with analog control channel and digital voice –
Many frequencies shared by many departments and the
control channel is...