User's Manual

TS4000 Radio Modem User’s Manual TS4000 Overview 3
transmit attack time (amount of time to initiate a transmission) does not have to
increased excessively.
For some frequency bands, there are multiple options for the radio module
channel spacing and bandwidth.
Channel Spacing
The channel spacing defines how close together the channels are within a band
(i.e. 12.5 kHz). To use channels with a certain channel spacing, the radio
module’s frequency synthesizer must be programmable to multiples or sub-
multiples of the channel spacing. The TS4000 radio module should be ordered
based on the channel spacing of the channels to be used.
Channel Bandwidth
The channel bandwidth is the amount of frequency spectrum that the radio
transmit signal is allowed to occupy (i.e. 16 kHz). This bandwidth must be
controlled in order to minimize the interference between users on adjacent
channels.
Transmit Channel Bandwidth
For the TS4000, the data rate and the type of modulation control the transmitted
channel bandwidth. Therefore, it is important that the TS4000 is setup so that its
transmitted bandwidth is less than that prescribed for the channels being used
(See Radio Setup, Licensing).
Receive Channel Bandwidth
The receive filters of the TS4000 radio module are designed for a specific
channel bandwidth. The radio module should be ordered with a receive filter
bandwidth that matches the bandwidth of the channels used.
Note that if multiple channel bandwidths are to be used, then the radio module
should be ordered for the channel with the highest channel bandwidth. This may
result in less than optimal performance on channels with narrower channel
bandwidths.
The TS4000 is available in either a standard or watertight enclosure (see
Appendix D - Case Dimensions).
The standard enclosure has four external connectors; an antenna connector, a
power connector and two serial port connectors.
The watertight enclosure is environmentally sealed and is designed to withstand
dust, rain and water splashes.
Caution: The watertight enclosure should not be submerged in water.
The watertight enclosure has two external connectors; an antenna connector and
an interface connector that provides the serial port and power connections. The
interface connector is a 19 pin LEMO connector. The mating connector for this is
a LEMO FGG.2B.319 series connector.
The TS4000 has two serial ports that provide a data connection between the
TS4000 and the host equipment. The serial ports are standard RS-232
Channel Spacing and
Bandwidth
Enclosure
Standard
Watertight
Connections
Serial Port