DIGITAL CHANNEL MODULE (CMD) User’s Manual and Tune Up Procedures 8A074X06 Rev.
REVISION RECORD REV # 0 ECN # DESCRIPTION Preliminary Release DATE August 1, 2003 PROPRIETARY STATEMENT © 2003, Futurecom Systems Group Inc. Printed in Canada. All Rights Reserved No part of this document, or any software included with it, may be reproduced and distributed without the prior written permission of the copyright holder. Futurecom Systems Group Inc.
TABLE OF CONTENTS About this document................................................................................................................ 4 Notes, Cautions, Warnings, Dangers................................................................................... 4 Safety Information ................................................................................................................... 5 FCC Class A Digital Device or Peripheral User Information .............................................
About this document This document describes the operation of the Futurecom Digital Channel Module (CMD). It provides setup guidelines and outlines the programming options which are accessible through the programming software (6A074X01). Notes, Cautions, Warnings, Dangers Throughout this manual, you will see Notes, Cautions, Warnings and Dangers. Their meaning is as follows: Note: A clarifying statement that expands on the text that follows.
Safety Information FCC Class A Digital Device or Peripheral User Information NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
This product does not contain customer serviceable components, therefore never disassemble the product IMPORTANT If an outdoor antenna is connected, make sure the system is always grounded to allow for protection against voltage surge and built-up static charges. Outdoor antennas should always be located away from power lines. DANGER Never alter the AC cord or plug! If plug does not fit outlet have a qualified electrician install a proper outlet.
Radio Frequency Energy Do not operate the transmitter when a person is outside of the vehicle within two feet of the antenna! Failure to heed this warning may result in burns or related physical injury to the person.
CMD Technical Description Main Features The Digital Channel Module (CMD) is a synthesized, microprocessor-based, high performance, RF channel selective repeater with 30 Watt output power capability. It is available in the VHF, UHF and 800/900MHz bands. It is designed to receive a single RF channel, filter and amplify the channel signal and retransmit it.
Principle of Operation The CMD consists of four main blocks – Front End, IF section, Power Amplifier and Controller. The Front End consists of band-pass filtering and low-noise amplifier. The sensitivity of the Front End is -120dBm. After the Front End, the RF frequency is downconverted to 109.65MHz by a mixer stage followed by BP filtering, amplification and another mixer downconverting to IF 450kHz.
CMD Installation (19” rack mount only) The CMD is easily installed by plugging it into the Eurocard format card cage. The CMD is powered through its card cage back plane. The card cage back plane DC wiring must be connected to nominal 27.6VDC. Slave CMDs Slave Shelf CMD Programming Introduction The Controller board EEPROM of the CMD contains the programmed Personality Data (PD) of the specific CMD unit.
Starting up the Programming Software After connecting the programming cable to the CMD serial port, run the programming software. Go to the Options pull down menu and select Ports. The following screen will be displayed: Ensure that the correct communication port is selected and set the Baud rate to 9600 b/s. If higher Baud rate is selected, ensure that the Baud rate scanning is set to Enable.
Important: When programming (or editing the personality of) the currently connected CMD, the user will be asked “Would you like to update the EEPROM” every time he / she tries to close the currently open programming screen. Select “Yes” if the changes need to be kept after the CMD is reset. For some of the changes to take effect the CMD must be reset. Programming the CMD Channel Spacing Prior to setting up the rest of the CMD parameters, the global channel spacing needs to be selected.
Setting up the CMD Maximum Gain The CMD can be used either as an On Channel Repeater (OCR) or as a translator. In the OCR mode, the CMD receive and transmit frequency is the same as opposed to the Translator mode, in which the receive and transmit frequencies are different. The Gain range is 70 to 140dB in OCR mode and 70 to 165dB in Translator mode. However, the gain is limited by the isolation that can be achieved between the rest of the RF system i.e. cables, antennas, filtering etc.
CMD Front Panel Indicators The CMD front panel has several LEDs which provide the following indications: LED Label TX DIS LED Color RED DC ON GREEN TX ON GREEN RX ON GREEN PWR RED VSWR RED 8A074X06 Rev. Preliminary 21/08/2003 DESCRIPTION The TX DIS LED is steady on when transmit is disabled either by: Triggering the TX DIS switch which is located above the LED (accessible with a round tool 2.
CMD Specifications ELECTRICAL SPECIFICATIONS CMD VHF CMD UHF CMD 800 Frequency of Operation 136 – 174 MHz 403 – 512 MHz 806 – 960 MHz Sensitivity -120 dBm -117 dBm Input Carrier Detection Threshold -120 to -50 dBm -117 to -50 dBm Carrier Detection Adjustment Step 1 dB Max.
