User's Manual

TS4000 Radio Modem User’s Manual TS4000 Overview 4
asynchronous serial interfaces and are setup as DCEs. The serial ports provide
all the standard RS-232 handshake lines. In addition, the TS4000 provides a
number of configuration options that allow the serial port line usage to be
customized for different host equipment (see Serial Port Configuration Options).
Signal Levels
Serial port 1 can be configured for either RS-232 or TTL signal levels. To change
the signal level setting, the modem must be opened and the four jumper plugs
next to the serial port connector moved to the desired position (See Appendix A -
Serial Port, Appendix E - PCB Component Locations, Appendix F - Internal
Jumper Block).
Standard Case
The serial port connectors are standard 9 pin subminiature D with female pins.
These ports can be mated to with standard PC serial cables. To minimize
emissions and interference, the serial cables used should be good quality
shielded cable (See Appendix A - Serial Port).
Watertight Case
The watertight case provides the serial port connections through a single sealed
interface connector (See Appendix A - Serial Port).
A variety of antennas can be used with the TS4000, but it is important that the
antenna provides a 50 ohm load at the radio’s operational frequencies. In
addition, all cabling used with the antenna must be good quality coaxial cable with
a 50 ohm characteristic impedance.
Caution: The modem should never be allowed to transmit without an
antenna or dummy load attached to the antenna connector.
Standard Case
The standard case comes with a 50 ohm female BNC antenna connector.
Watertight Case
The watertight case comes with a 50 ohm female TNC antenna connector.
The TS4000 requires a DC supply voltage between 9 and 28 volts. Note that the
minimum supply voltage depends on the particular radio module in the TS4000.
In addition, the power (watts) used by the TS4000 also depends on the particular
radio module.
Switching Voltage Regulator
Internally, the TS4000 has a high efficiency switching voltage regulator (as
opposed to a linear voltage regulator). The switching regulator minimizes the
amount of power that the TS4000 requires. Also, the power required (watts) is
independent of the input supply voltage.
Power Supply Current
The power supply current required depends on the input voltage used. This can
be calculated with the following formula.
Max Power Supply Current (amps) = Max Power (watts) / Input Voltage
Antenna Connector
Power Connection