Harris M7300 Series Bedienungsanleitung
ECP-3406
M7300 Scan Model
Mobile Radio
User’s Guide
for Orleans County, NY
Training Session Notes
Trunked Radio System
ECP-3406 page 3
Project 25
Interoperable digital radio system standard
Intended for all public safety LMR bands
(VHF, UHF, and 800 MHz)
Developed Jointly by:
TIA
Association of Public-Safety Communications Officials (APCO)
National Association of State Telecommunications Directors
(NASTD)
Various agencies of the Federal government (FED) in the early
90’s to improve spectral efficiencies
TIA/EIA Standard in 1999. Under TIA/EIA-102
ECP-3406 page 4
Project 25 Benefits
Key benefits sought by the user community:
–Competitive procurement of equipment
–Interoperability of equipment
–Spectrum efficiency
–User-friendly operation equivalent to today's public
safety equipment and common across all bands,
system configurations, services, and
manufacturers
ECP-3406 page 5
* SAFETY ITEMS *
DO NOT...operate the mobile radio when someone is outside the vehicle
within two feet of the antenna. This is a recommendation from OSHA
that applies to any type of radio transmitter such as a cellular
telephone, CB radio, our old radio system, or our new radios.
DO NOT...operate the mobile radio if any of the antenna connectors are
loose. This is a basic safety precaution. If the antenna cable or
connectors are loose, please place a service call for repair.
DO NOT...operate the mobile radio near or in an area where blasting is
taking place. Anyone using radio controlled explosives must post
signs. If you see a caution sign about blasting in the area, you must
turn your radio off. This applies to any radio equipment capable of
transmitting: phones, CBs, etc.
DO NOT...operate the mobile radio in an explosive atmosphere. The
radio is an electrical device with switches that can cause an explosion
in an explosive atmosphere. If you can operate your vehicle or any
power tools, it is safe to use the radio.
ECP-3406 page 6
Operating Rules and Regulations
The Federal Communications Commission sets all rules for two-
way radio use. All users of two-way radio equipment should be
familiar with these basic rule requirements.
It is a violation of FCC rules to interrupt any distress or
emergency message
Any use of profane or obscene language is prohibited
It is against the law to send false call letters or a false distress
or emergency message
All messages must be brief and limited to the business need
It is a violation of FCC rules to send personal messages,
unless in an emergency
The FCC requires that radio systems be identified by use of
the assigned Call Letters –the radio system does this
automatically
ECP-3406 page 7
Conventional vs. Trunked
Computerized Assignment of Channels
Service Employee
Customer
Conventional Trunked
Service Counter
Service Counter
ECP-3406 page 8
Why Trunking?
Improves spectral efficiency
Relieves the user from managing the channel
Encourages cross agency / shared communications
Establishes communications privacy
Encourages private communications
Discourages eavesdropping by scanners
Establishes “queuing” rather than “waiting”
Enables priority use during busy times
Trunking:
ECP-3406 page 9
Trunked Radio System Features
Digital Control Channel
Multiple Working Channels
< 0.5 Second Access
Group & Individual Voice Calls
Logical ID (LID) for each radio
Late/Delayed Entry
Emergency Calls
Queuing with Priority
Unit Enable/Disable
Wide Area Coverage
ECP-3406 page 10
???
Communication Range
Many factors affect range:
Site Location
Urban Clutter
Reflections/Multipath
Ducting over Water
Heavy vegetation
Weather
Frequency
ECP-3406 page 11
Multisite - What the Radios Do
Units inform the System of their location:
Each time the Radio is powered up
Each time a System selection is made
Each time a Group selection is made
When Radio detects a high bit error rate on the Control Channel,
Radio will look for another site (algorithm programmed in radio),
Automatically switches to new site when criteria met
Site 1 Site 2
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