8M074X01-01 Rev.1 User’s Manual 8M074X01-01 REV.
8M074X01-01 Rev.1 TABLE OF CONTENTS Page FCC / IC Compliance Statements.............................................................................xi 1.0 Safety Information ........................................................................................................1 2.0 General Radio Procedures Operating .....................................................................3 3.0 Specification .......................................................................................................
8M074X01-01 Rev.1 FCC Class A Digital Device or Peripheral - Information to User Ü 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.
8M074X01-01 Rev.1 1.0 SAFETY INFORMATION The following information may or may not be applicable to your product. In any case, precautions should always be taken when handling any electrical product. • This manual contains important safety and operating instructions, therefore keep this manual always on hand! • Prior to using any product, follow all warning, safety and operating instructions written on the product and in the user’s manual.
8M074X01-01 Rev.1 The operator of any mobile radio should be aware of certain hazards common to the of vehicular radio transmissions. operation A list of possible hazards follows: 1. Explosive Atmospheres To ensure safety, make sure that the radio is off while fueling the vehicle. When the radio is mounted in the back of the trunk, never have containers of fuel in the trunk of the vehicle.. 2.
8M074X01-01 Rev.1 2.0 GENERAL RADIO OPERATING PROCEDURES Industry Canada (IC) and the Federal Communications Commission (FCC). rules and regulations must be incorporated in the use of radio systems. Familiarity with these rules by the operator is essential for proper execution of the type of radio operation that is in question. Following these rules helps to eliminate confusion, assures the most efficient use of existing radio channels, and results in a smoothly functioning radio network.
8M074X01-01 Rev.1 3.
M074X01-01 Rev.1 DCS/CTCSS ü 4.0 INTRODUCTION This manual describes the Futurecom Channel Module (CMDUHF). The Channel Module is a synthesized, microprocessor-based, high performance radio unit. It is designed to increase the coverage area of an existing radio site by receiving and re-broadcasting from host to user (downlink), and from user to host (uplink). The operation of the Channel Module is fully transparent to the user of the host radio system.
8M074X01-01 Rev.1 5.0 MAIN FEATURES The Channel Module is a fully software configurable, synthesized, narrow band device, with 35 Watt output power capability. Its purpose is to receive a single RF channel, amplify and filter the channel signal and re-transmit it. The Transceiver (TS) stage receives a single channel off air using double heterodyne principle and downconverts the signal to an Intermediate Frequency .
8M074X01-01 Rev.1 The programming software allows to display on the computer screen the measured values of received signal power level, actual transmitted power level, VSWR on the Tx output port, and the internal temperature of the unit. 6.0 BLOCK DIAGRAM AND DESCRIPTION The block diagram of the Channel Module is shown in 8D074A14 drawing. The Channel Module consists of the following blocks: Transceiver, Power Amplifier and Controller module. 6.
8M074X01-01 Rev.1 6.2 POWER AMPLIFIER The Power Amplifier is capable of delivering up to 35 W output. A band-pass filter filters out of band unwanted signals. The driver and the power amplifier provide the required output power. The output power level is set under software control. The real output power is measured and compared with the desired output power level. An Automatic Level Control Loop adjusts the real output power to be precisely equal to the preset level.
8M074X01-01 Rev.1 7.0 SET UP 7.1 PROGRAMMING SOFTWARE INSTALLATION Futurecom 6A074X01 Programming Software must be installed on a personal computer which will be used for the Channel Module field system installation. The personal computer must run under MS-DOS operating system. Software must be installed only once before the first Channel Module installation. The following steps must be performed for the Futurecom Channel Module Programming Software installation: 1.
8M074X01-01 Rev.1 1. Make sure that the Futurecom Channel Module Programming Software is installed as described earlier. 2. Connect the Channel Module as described in Channel Module Connections section and power it up. It is recommended that the donor site transmitter is disabled during Channel Module settings! 3. Connect the personal computer to the Channel Module front panel RS-232 connector with Futurecom CM Serial Programming Cable, part number 7W038X61-01. 4.
8M074X01-01 Rev.1 7.4 BASICS OF GAIN SETTING The following Steps set the output power and gains in the Channel Module. (Note that setup must be performed for both the Downlink and the Uplink.) The basic rule for setting the gain can be summarized as follows: For OCR Mode (Receiver Frequency equals Transmit Frequency): The total gain of the Channel Module must always be less than isolation between receive and transmit antennas and cables. A 10dB minimum margin is recommended.
8M074X01-01 Rev.1 2. Set the frequency of operation in “Receiver Frequency” field and “Transmitter Frequency” fields to be equal to the Channel Module downlink transmit frequency. Frequencies can be entered by typing the value in MHz in the given field and pressing . 3. Set desired output power in “Tx Pwr Pot”. 4. Make sure that the donor site is not transmitting! 5. Key up the Channel Module by setting “PTT” ON. 6. Read “own” “?RSSI”.
8M074X01-01 Rev.1 15. Read “own” “?RSSI”. The difference between “Tx Pwr Pot” and “own” “?RSSI” is the Antenna Isolation. 16. Unkey the Channel Module by setting “PTT” OFF. 17. Set “RSSI CAS Threshold” at least 6dB higher than “own” “?RSSI” level. The “RSSI CAS Threshold” level should be as low as possible for maximum sensitivity. 18. Set correct frequencies of operation in the “Receiver Frequency” and “Transmitter Frequency” fields. 19. Exit “Block Diagram Menu” by pressing .
8M074X01-01 Rev.1 8.0 OPERATION 8.1 GENERAL The Channel Module does not require any supervision once it is installed and set up. The status of the unit is indicated by Front Panel Indicators: • TX DIS Indicator is a dual function indicator. • TX DIS Indicator is on when transmit is disabled as described later. • TX DIS Indicator is flashing when one of the synthesizers is out of lock (likely due to the Channel Module not being properly programmed). • DC ON Indicator is a dual function indicator too.
8M074X01-01 Rev.1 8.3 RESET RESET switch is accessed via the front panel hole with a round tool 2.5mm (0.1”) in diameter. RESET switch is used to reset the Channel Module in an unlikely event of malfunction.
8M074X01-01 Rev.1 9.0 CLEANING INSTRUCTIONS Never use an abrasive or a petroleum based solvent cleaner on equipment. The unit can be cleaned using a mild liquid detergent and water or a soft cloth with furniture polish.
8M074X01-01 Rev.
