Operations Manual

DESCRIPTION 2-1
O&M of the MCC-545B PACKET DATA RADIO
12/2000
2.0 DESCRIPTION
2.1 General Description
The MCC-545B Packet Data Radio provides versatile communications from fixed or mobile
sites. The 545B can be used for sending and receiving messages, position reporting, data logging,
or other specific applications. Designed to operate over a fading groundwave and an intermittent
meteor burst communications channel, the unit's low standby-power consumption (<1 watt)
makes it ideal for remote locations or mobile operation.
The 545B features rugged construction in a weather-resistant enclosure that measures 10.6 " x
4.0" x 2.42" and weighs less than 3.5 pounds.
A photograph of the 545B is given in Figure 2.1.
The unit operates in a half-duplex mode and contains a solid state Tx/Rx switch that allows a
common antenna to be shared for both transmit and receive. It can be operated with a single
frequency or on two separate frequencies.
The unit utilizes three phase locked frequency synthesizers to set the Tx and Rx frequencies.
The operator can set the frequency to any authorized frequency (10KHz steps) within a 2 MHz
band. A factory-trained technician is required to retune the transmitter and synthesizer if
operation outside a 2 MHz band is desired. The unit can be factory tuned across the full 37 to 50
MHz band
2.2 Send and Receive Messages
The 545B provides full text message capability. With a portable operating terminal, or a PC
running terminal emulation software, you can exchange messages with any other Remote Station
in the network.
Messages may be plain text or binary data. They can be routed to single or multiple destinations
or, to a Host Computer or Data Center.
2.3 Data Logging
The 545B can be programmed to acquire, store, and transmit data from the various I/O signals
noted below. Any analog or digital input can be used to trigger a transmission or to set a discrete
output level. Output levels can also be set hi or low via a command received from a distant unit.