Channel Module Product Description + The Channel Module is an RF channel selective repeater. It can be used in the On Channel Repeater (OCR) or Translator mode. As no base band demodulation, demodulation process lakes place within the Channel Module, signals are amplified with minimal distortion ond propagation delays. Different filtering characteristics and bandwidths can be provided to ensure compatibility with most types of analog/digital signaling formats and channel spacing.
Electrical Specifications LL Frequency of Operation 403-470 MHz Sensitivity -117 dBm Input Carrier Detection Threshold ~110 to -50 dBm Carrier Detection Threshold Adjustment Step 2 dBm Carrier Detection Attack Time <2 ms Maximum Gain Range On-Channel Repeater [OCR] 7010 120 dB (Programmable) Translate 70 to 160 dB AGC Range 70 dB AGC Attack Time <1 ms AGC Decay Time <1 ms Output Power TWto20W Output Power Tolerance -0dB, +1dB Duty Cycle 100% Output Frequency Stability On-Channel Repeater Pass band Frequency
B8M046X01-01 REV, 5 FCC Class A Digital Device or Peripheral information to User 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.
BMO46XU1-01 REV. S 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.
8MO46X01-01 REV, 5 The operator of any mobile radio should be aware of certain hazards common to the operation of vehicular radio transmissions. 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.
SM046X01.01 REV. 5 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 radii network.
3.0 SPECIFICATIONS SMALLPOX-01 REV. 5 Electrical Specifications CM VHF HP CM UHF HP | CM 800 HP Frequency of Operation 136174 MHz 403470MHz | 806.960MHZ Sensitivity min. -117 dBm Input Carrier Detection Threshold -120 0 -50 dBm Carrier Detection Threshold Adjustment Step 0.3dB Carrier Detection Attack Time <2 ms Maximum Gain Range On-Channel Repeater (OCR) 70 to 120 dB (Programmable) Translator 700 160 dB AGC Range 70 dB AGC Attack Time 0.
8MO46X01-01 REV. § 4.0 INTRODUCTION This manual describes the Future com Channel Module (CM). The Channel Module is a synthesized, microprocessor-based, high performance radio unit. It is designed to increase the average area of an existing radio site by receiving and rebroadcasting from host to user (downwind, and from user to host (linkup. The operation of the Channel Module is fully transparent to the user of the host radio system.
SM046X01-01 REV. 5 5.0 MAIN FEATURES The Channel Module is a fully software configurable, synthesized, narrow band device, with 20 Watt output power capability. It is available in VHF, UHF and 800/900MHz bands. Its purpose is to receive a single RF channel, amplify and filter the channel signal and re-transmit it. The Front End (FE) stage receives a single channel off air using double heterodoxy principle and down converts the signal to an Intermediate Frequency (IF) stage.
8MO46X01-01 REV. 5 6.0 BLOCK DIAGRAM AND DESCRIPTION The block diagram of the Channel Module is shown in 8D046A14 drawing. The Channel Module consists of four blocks: Front End, Intermediate Frequency, Power Amplifier and Controller module. 6.1 FRONT END Front End starts with a band-pass filter that filters out of band unwanted frequencies. It is followed by a low noise amplifier which can be switched inf out of the signal path under software control. A software 30dB controlled attenuation is next.
8M046X01-01 REV. 5 6.3 POWER AMPLIFIER The Power Amplifier is capable of delivering up to 20W 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 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.
BM045X011-01 REV. 5 7.0 SET UP 7.1 PROGRAMMING SOFTWARE INSTALLATION Future com 6A046X01 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 Future com Channel Module Programming Software installation: 1.
8MO45X01-01 REV, § 7.3 MODE OF OPERATION SETTING The procedure to set up the mode of operation for the Channel Module is as follows: L Make sure that the Future com Channel Module Programming Software is installed as described earlier.
SMO46X01-01 REV, 5 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 Down link and the Up link) 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. In addition, 10dB margin is recommended.
8MO45X01-01 REV. 5 3. Set the frequency of operation in “Rx Ck” field for the OCR mode. Set the frequencies of operation in “Rx Ch” and “Tx Ch” fields to be equal for the Translator mode. All frequencies are equal to the Channel Module down link transmit frequency. Frequencies can also be entered by typing the number in the given field and pressing . 4. Set “FE: Air” between 4 and 8dB. This setting can be higher than 8dB. S. Set desired output power in “Tx PWR Pot”. 6.
SMO46X01-01 REV. Key up the Channel Module by setting “PTT” ON. . Read “own™ “?RSI. The difference between “Tx PWR Por” and “own” “?RSI” is the Antenna Isolation, . Turnkey the Channel Module by setting “PTT” OFF. . Set “RSI CAS Th” at least 6dB higher than “own” “?RSI" level. The “RSS! CAS Th" level should be as low as possible for maximum sensitivity. Set correct frequencies of operation in the “Rx CA” and “Tx Ch” fields. Exit “Block Diagram Menu” by pressing .