Laird Controls North America Inc. MRF220 사용자 설명서

 

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12/2003, CATTRON-THEIMEG

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Page 3 of 6 

Depending upon the System Operating Frequency, the RCR 'Gold Box' may incorporate a 220 MHz  or 
a R3HNX (450 MHz band) Transceiver Board.  

The Transceiver Board is a multi channel, synthesized RF receiver with a  Liquid  Crystal  Display 
(LCD).  Additionally, it has a built in RF transmitter for ‘POLLING

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’ data transmission. The receiver 

section incorporates a microprocessor and uses Digital Signal Processing (DSP) techniques to 
selectively recover digital messages using CATTRON-THEIMEG

™

 protocol.  The receiver section also 

has LED indicators for: 

•

  Power ON 

•

  Carrier Detect (RF signal or carrier is present) 

•

  VCO Lock (receiver locked on freq.) 

•

  Data (received message data) 

•

  Q-sync (synchronization pulse)  

The RF Power Amplifier Board  is a high power RF amplifier that connects between the R3HNX 
Transceiver Board  and the Antenna Connector.   An on-board LED indicator shows when transmitted 
digital RF ‘POLLING

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’ data from the transmitter section  is being amplified and sent to the RCT.   Note 

that systems operating in the 220 MHz Band do not require this board.  

Opening the front door of the RCR enclosure and removing the 'Gold Box' lid will expose the 
Transceiver Board, and in the case of a R3HNX MHz transceiver board, the ‘companion’  RF Power 
Amplifier Board.   Referring to Figure 1-1 and Table 1-1 below, transceiver and amplifier board LED 
indicators  indicate system status and are particularly useful to the technician when troubleshooting and 
adjusting the transceiver.