IDAS™ Digital Simulcast

Wide Area Coverage on a Single Pair of Frequencies
The IDAS Simulcast synchronizes multiple repeater sites for seamless wide area repeater coverage using just apair of frequencies, regardless of the number of repeater sites in the network*. Each repeater site in the system
is simply composed of only a network controller, GPS antenna and repeater. No external timing reference unit,
no additional modulation unit or other equipment is required.
* The maximum number of sites for an IDAS Simulcast system is 32.

Simulcast System

Multi-Site Conventional System
Site 1f1(Frequency)

Site 1

f1

Site 2

f2

Site 2

f1

IP Network(Private or VPN)

Site 3f3

Site 4

f4

IP Network(Private or VPN)

A unique pair of frequencies is requiredfor each repeater site.

Site 4Simulcast Repeater Site

f1

Site 3(Up to 32 sites per system)

f1
Master repeater(Controller)

IC-FR5300 series

Overlap area

UX-241 GPS Antenna
UC-FR5300 #14

A pair of frequencies coverage(1 unit required per channel)*Note: Private IP Network or VPN Tunnels through the Internet.

Seamless Coverage
Simulcast repeaters transmit a signal on the same frequency and atthe same time with GPS synchronization. Using the digital signal,
the IDAS simulcast system can greatly reduce signal degradation in
overlapping areas. By tuning the timing of the repeater transmission, overlapping signal areas can be adjusted relatively simply.

Repeaters transmit a downlink signal in sync at the same frequency.

Simulcast Selects the Best Signal
Uplink signals received by each repeater site are first collectedby the Master Repeater (Controller) through the network. The
best uplink signal is selected and distributed to all repeater
sites to be retransmitted.

Abundant IDAS Radio Lineup
All NXDN™ compatible IDAS radio terminals can be used on theIDAS simulcast system. In addition, the radio terminals wait for acall without scanning, so the battery consumption can bereduced. It extends the operating time, when compared to aconventional multi-site system.
No external devices, software or license is requiredfor IDAS Simulcast

No complex settings areneeded to use IDAS
Simulcast

UplinkDownlink

Downlink

Downlink

Masterrepeater

The master repeater selects the best signal to downlink.

Scalability and Flexibility
Installation and maintenance of a simulcast system could not beeasier. You can effortlessly expand the coverage area by justadding repeaters. Additional pairs of frequencies are not required.
Those repeaters can be integrated into the network with simple
setup (no reprogramming of radio terminals is necessary).

6.25 kHz FDMA Technology is ideal for Simulcast
In a simulcast system, there is an overlapping area where multiple signals arrive
from two or more repeater sites. Delay spread means the time difference
between receiving the signals, according to the distance from the respective
repeater sites. Delay spread can make received audio unintelligible, similar tomultipath fading, which reduces repeater coverage.

Delay spread tolerance = 60 μs

Symbols

Simulcast Delay Spread
1 mile; 5.37 μs

Symbol duration

15 miles; 80.55 μs

Signals received at the radio
about 75 μs apart
Radio terminal

TimeIDAS, 2400 symbols/second. (4800 bps = 6.25 kHz NXDN)

Simulcast Site 2

The IDAS Simulcast system sends digital voice and data in 4800 bps using
4-Level FSK, and 6.25 kHz very narrow bandwidth FDMA technology. Symbol
duration is about 420 microseconds (μs). This long symbol duration affects verysmall Inter-Symbol Interference (ISI). As a result, the delay spread tolerance ofthe IDAS Simulcast system is about 60 μs. The simplicity of a non-linear
transmitter and GPS synchronization enables an FDMA digital system toachieve wide repeater coverage as an analog FM simulcast system.
By comparison, the delay spread tolerance of a DMR/P25 Phase 1 system isabout 30 μs, the coverage radius is reduced by a similar amount. In a P25
simulcast system, a more complex Linear Simulcast Modulation system isrequired to maintain a better tolerance to delay spread and for greater repeater
coverage.

Symbol duration
Delay spread tolerance = 30 μs

Symbols

Simulcast Site 1

Time
DMR/P25 Phase 1, 4800 symbols/second. (9600 bps = 12.5 kHz)

Application Example — Highway, Railroad Communication Solution
The IDAS Simulcast system provides mobile communication along a highway or railroad.
You can communicate all the way on the same channel.

RoIP Gateway

VE-PG4
Provides an interconnection withan IP Phone, LTE radio,
WLAN radio and analog radio.

Repeater site
Repeater site

IP Network(Private or VPN)

Remote Communicator

Repeater site

RC-FS10A virtual radio/simple
dispatcher software ona Windows ® based PC.

Seamless coverage

Operations room
• Remote monitoringIDAS™ DIGITAL SIMULCASTVHF REPEATER

UHF REPEATER|FR5300|FR6300

FEATURESREAR PANEL VIEW

• 136–174, 400–470, 450–512, 450–520 and 330–400 MHz• 50 W output power at 50% duty,
25 W at 100% duty cycle operation (Ambient temperature: 25˚C)• 32 channel capacity and 5 programmable buttons• 19-inch rack mount design, 2U height low profile design• Two RF modules in one unit* (* UR-FR5300 or UR-FR6300 required.)• PC programmable through an IP network* (*UC-FR5300 required)• D-SUB 25-pin accessory connector• CW-ID transmitter• SNMP/SYSLOG• Simple simulcast setup and maintenance through a web browser

GPS Antenna

Ethernet

Optional UC-FR5300

Installation space for an optional
channel module

RX Antenna
External Speaker

TX Antenna

D-SUB 25-Pin

REQUIRED NETWORK BANDWIDTH

To a DC Power source

40 kbps × number of repeater sites or a minimum of 100 kbps is required.
For example, 40 kbps × 5 repeater sites = 200 kbps

REQUIRED ACCESSORIESOPTIONAL ACCESSORIES(for an IDAS Simulcast system)(for the IC-FR5300/FR6300 series repeaters)

IDAS NETWORK CONTROLLERSIMULCAST SOFTWARE

GPS ANTENNAUC-FR5300 #14
Includes CF-FR5300SC

CF-FR5300SC
Supplied with UC-FR5300 #14

UX-241 Cable length 5 m,
16.4 ft

CHANNEL MODULES
UR-FR5300 :136–174 MHz, 50 W
UR-FR6300 : 400–470, 450–512, 450–520,

EXTERNAL SPEAKERS
SP-35: 2 m, 6.6 ft cableSP-35L: 6 m, 19.7 ft cable

330–400 MHz, 50 W

Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the United Kingdom, Germany, France, Spain, Russia, Australia, New Zealand and/or other countries. IDAS, IDAS logo aretrademarks of Icom Incorporated. NXDN is a trademark of Icom Incorporated and JVC KENWOOD Corporation. Windows is either a registered trademark or a trademark of Microsoft Corporation in the United States and/or other countries.
All other trademarks are the properties of their respective holders.

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