Bedienungsanleitung Uniden BCD325P2 (Seite 16 von 132) (Englisch)

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• Motorola Type I

• Motorola Type II

• Motorola Type IIi Hybrid

• Motorola Type II Smartnet

• Motorola Type II Smartzone

Omnilink

• Motorola Type II VOC

• LTR Standard

• Project 25 Standard

• Motorola X2-TDMA

• P25 Phase I and Phase II

• EDACS Standard (Wide)

• EDACS Narrowband (Narrow)

• EDACS Networked (Wide/

Narrow)

• EDACS SCAT

• EDACS ESK

When you program Motorola/P25 and EDACS system frequencies into the scanner,

one frequency is the control (or data) channel, and the rest are voice frequencies

shared by all the users. There may be 3 or 4 frequencies assigned as (primary or

alternate) control channels but only one control channel will be active at a time.

These scanners will allow you to program just Motorola/P25 control channels into

the trunking system and the voice channels will automatically be found (but not

programmed). EDACS systems need all the frequencies for the system programmed

and with the correct LCN (Logical Channel Number) assigned.

The control channel continually transmits to the field units and has a sound similar to

listening to a boat engine over the phone (in manual mode; you won’t hear this when

you are trunking the system.) This control channel is also a good check to see if you

can trunktrack the system. If you can’t hear a control channel when you step through

the trunking frequencies (in manual mode) or can hear dropouts or interference,

you either are too far away to receive the control channel and the system or there is

some interference source that will inhibit tracking and reception. Motorola systems

are limited to a maximum of 28 frequencies per site. EDACS systems are limited

to 25 frequencies per site. Motorola and EDACS systems can be either analog,

digital, or mixed (digital and analog talkgroups). Mixed Motorola systems should

be programmed as Motorola systems and not P25 digital systems. That way the

talkgroup options will allow you to select if it is a digital or analog.

LTR systems work a little differently. LTR systems typically do not have a dedicated

control channel. This type of system encodes all trunking information as digital

subaudible data that accompanies each transmission. The frequencies also have to

have the LCN (Logical Channel Number) programmed for the scanner to trunktrack

properly. Each repeater has its own controller, and all of these controllers are

synchronized together. Even though each controller monitors its own channel, one

of the channel controllers is assigned to be a master that all controllers report to.

Each of these controllers sends out a data burst approximately every 10 seconds so

that the subscriber units know that the system is there. This data burst is not sent at

the same time by all the channels, but happens randomly throughout all the system

channels. If you listen to the frequencies of an LTR system in manual mode (not

trunking), on every channel in the system you will hear this data burst that will sound

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