LMM3115 - Mobile Radio
The LMM3115 is a 25 watts PEP mobile radio
designed to operate on 5 kHz channel assignments. A modulation scheme named Linear
Modulation is used, which is spectrally efficient and provides a medium well suited to the
varying propagation effects (e.g. multipath and Doppler) encountered in a typical mobile
environment. The radio is capable of both voice and data use, with data rates of up to
14.4 kbps achievable.
The LMM3115 operates in two frequency simplex modes
on the 200 channels in the 220 MHz band, (221-222 MHz mobile transmit, 220-221 MHz mobile
receive). The radio employs digital signaling and trunked operation using the Advanced
Digital Network Trunking (ADNT) system, based on the UK specification MPT1327.
The LMM3115 provides the following features:
RS 232 Port
The radio is field programmable, allowing it to be
customized for both the system it is to be used on and for the particular user. The mobile
can withstand vibration, shock and temperature extremes typically encountered in a mobile
environment. The unit consists of a die-cast alloy chassis and an injection molded ABS
front panel display.
The LMM3115 supports a number of
different data facilities including control and communications via the serial port on the
back of the unit.
Short Data Message Type 1 (SDM1)
These are two digit Status Messages that can be sent from the front panel of the display.
Long Data Messages (LDM)
These are messages up to 1200 bytes that are sent over a traffic channel in terminal mode.
High Speed Data
These are messages of a length limited only by call time that are sent over a traffic
channel at speeds up to 14.4 kbps. Once a high-speed data call is set up, data can be both
sent and received, depending whether the transceiver is in Tx or Rx mode.
|LMP3215 Portable Radio
The LMP3215 is a new, feature-rich, highly
advanced portable that has been specially developed for the 220 user. Its unique styling
and rugged construction provides unparalleled reliability. Simple-to-use multi-functional
controls, an alphanumeric backlit display and several battery choices that can provide up
to a 12-hour duty cycle make this radio easy to use. Features included are emergency,
status, identity calling and data facilities. The power output is also programmable from
0.1 to 5 watts in six steps.
Available accessories include battery charger,
leather case, speaker microphone, antenna, and vehicle kit.
The LMP3215 provides a fast 14.4 kbps, V32 modem
data facility that utilizes state-of- the-art 128 QAM trellis coded modulation techniques.
No forward error correction is used and real data throughputs are considerably faster than
other systems. The data rates are dynamic in that they vary according to signal
conditions, thus ensuring reliable data communications. The RS232 port enables instant
connection to computing and data terminals such as palmtops, laptops, PDAs and bar code