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The radio provides half-duplex voice communications, and both half- and full-duplex data
communications. Voice communication is accomplished via a “push-to-talk” (PTT) type microphone and
a speaker connected to the mobile radio’s control head.
For data communications, the radio has an industry-standard TIA/EIA/RS-232 serial interface port for
connecting optional data-type equipment, such a Mobile Data Terminal (MDT), a laptop PC, a third-party
display, or a key-entry device. This port works seamlessly with equipment from popular manufacturers
and off-the-shelf applications. OpenSky employs User Datagram Protocol over Internet Protocol
(UDP/IP) data packet transfers, providing “plug and play” connectivity for data-type devices.
700 MHz operating bands of the radio include the two 3 MHz wide repeater output bands from 764 to
767 MHz and 773 to 776 MHz, and the two 3 MHz wide repeater input bands from 794 to 797 MHz and
803 to 806 MHz. The mobile can operate only on the narrowband channels within these bands and, as
previously stated, transmit output power is limited to 300 milliwatts.
800 MHz operating bands of the radio include the Specialized Mobile Radio (SMR) and the National
Public Safety Planning Advisory Committee (NPSPAC) radio frequency channels. This includes the 806
to 825 MHz repeater input band and the 851 to 870 MHz band used for repeater output and talk-around
communications. These bands provide a total of over 830 possible channels spread over the
806 - 824 MHz mobile transmission and 851 - 869 MHz mobile reception bands.
The radio has a built-in Global Positioning System (GPS) tracking receiver. GPS provides quick and
accurate unit location information to dispatchers via the radio network. The GPS receiver determines the
unit’s location and the radio transmits it to the radio network. The GPS antenna may be integrated into the
mobile transmit/receive antenna (a “combination” antenna) or it may be separate from the mobile
transmit/receive antenna.
The radio meets or exceeds many tough environmental specifications included within military standard
MIL-STD-810F, automotive industry standard SAE-J1455, the radio industry standard TIA/EIA-603, and
the radio standard established by the U.S. Forest Service.
OpenSky employs Adaptive Multi-Band Excitation (AMBE™) voice-coding technology developed by
Digital Voice Systems, Inc. AMBE allows the radio to deliver exceptional voice quality, even in weak
received signal areas (i.e., “fringe” areas).
OpenSky radio network also uses Time-Division Multiple-Access (TDMA) modulation technology. This
technology allows multiple radio users to share a single RF channel. In addition, a single RF channel can
support simultaneous digital voice and data communications.
This manual contains installation procedures for the mobile radio, and the CH-103 and CH-103PA control
heads. These procedures cover the mounting and cabling of the equipment as well as the testing of the
radio and control head. Interconnect wiring diagrams are included at the rear of this manual.
CAUTION
M/A-COM recommends the buyer use only a M/A-COM authorized
representative to install and service this product.
The warranties provided to the
buyer under the terms of sale shall be null and void if this product is installed or
serviced improperly, and M/A-COM shall have no further obligation to the buyer for
any damage caused to the product or to any person or personal property.