ON-CHANNEL REPEATER (OCR) Users Manual 8A535X01 Rev.
REVISION RECORD REV # Preliminary Preliminary01 ECN # DESCRIPTION Original Release Original Release DATE June 8, 2006 March 23, 2007 PROPRIETARY STATEMENT © 2006,2007 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, Attentions, Important................................................................................................ 4 SAFETY INFORMATION ..................................................................................................... 5 GENERAL SAFETY INFORMATION..............................................................................
ABOUT THIS DOCUMENT This document describes the operation of the Futurecom On-Channel Repeater (OCR). It provides setup guidelines and outlines the programming options, which are accessible through the programming software (6A074X01). Notes, Attentions, Important Throughout this manual, you will see Notes, Attentions and Important. Their meaning is as follows: NOTE A clarifying statement that expands on the text that follows.
SAFETY 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 equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, can cause harmful interference to radio communications.
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.
Antenna Gain dBi dBd Antenna RF Power 1W 5W 10 W 15 W 20 W 25 W 30 W 37.3 W 0 -2.15 2.15 0 5.15 3 8.15 6 11.15 9 14.15 12 17.15 15 18 40 57 69 80 89 98 109 23 51 72 88 102 114 125 139 33 72 102 125 144 161 176 196 46 102 144 176 203 227 249 277 64 144 203 248 287 320 351 391 91 203 286 351 405 452 496 552 128 286 404 495 571 639 700 780 TABLE 1 OCR UHF MPE Safe Distances in cm for Various Antenna Gains Antenna Gain Antenna RF Power 1W 5W 10 W 15 W 20 W 25 W 30 W 37.3 W dBi dBd 0 -2.
G: numeric gain of antenna relative to isotropic radiator. r: distance to centre of radiation in cm. RF EXPOSURE DISTANCE LIMIT: r = (PG/4ΠS)1/2 = (EIRP/4ΠS)1/2 For General Population/ Uncontrolled Exposure: S = 0.2 mW/cm2 for frequency range of 30MHz – 300MHz. S = f/1500 in mW/cm2 for frequency range of 300MHz – 1500MHz. f is the minimum used frequency in MHz. As an example, let us consider a case of minimum frequency f = 380MHz, RF power P = 37.3W and an antenna with gain of 2.
RF Exposure Label 8A535X01 Rev.
OCR TECHNICAL DESCRIPTION MAIN FEATURES The On-Channel Repeater (OCR) is a synthesized, microprocessor-based, high performance, RF channel selective repeater with 30 Watt output power capability. It is available in the VHF, UHF, 700MHz 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 OCR consists of four main blocks – Front End, IF section, Power Amplifier and Controller. The Front End consists of band-pass filtering, low-noise preamplifier and adjustable PIN diode attenuators. The sensitivity of the Front End is -120dBm. After the Front End, the RF frequency is downconverted to an IF frequency by a mixer stage followed by BP filtering, amplification and another mixer downconverting to a seconf IF frequency.
OCR INSTALLATION The OCR is easily installed by plugging it into the Eurocard format card cage which can accommodate up to five OCRs. The DC supply wiring must be connected to nominal 27.6VDC. For more information on multi channel options call the Futurecom sales department to obtain a quotation. Master Shelf Slave CM-Ds Slave Shelf Master Slot 8A535X01 Rev.
OCR PROGRAMMING INTRODUCTION The Controller board EEPROM of the OCR contains the programmed Personality Data (PD) of the specific OCR unit. The PD file determines the functionality of the OCR and it can be created and / or modified by using the OCR programming software. CONNECTING AND DISCONNECTING THE OCR TO A PC 1. Plug the supplied programming cable into the “RS232” connector on the front of the OCR. 2. Plug the other end of the serial cable into the serial port of the PC. 3.
USING THE PROGRAMMING SOFTWARE FOR SETTING UP THE OCR STARTING UP THE PROGRAMMING SOFTWARE After connecting the programming cable to the OCR serial port, run the programming software. The following screen will be displayed: USING THE PROGRAMMING SOFTWARE ON-LINE For successful On-Line operation the OCR needs to be properly connected prior to commencing the programming / system setup: 1. The OCR must be plugged into the Futurecom subrack and supplied with proper DC power supply. 2.
IMPORTANT The OCR Power Output and CAS Thresholds determine the OCR maximum Gain, which must be at least 10dB lower than the measured overall system isolation. The isolation measurement and gain setting procedure is described in the Setting up the OCR Gain section of this document. SETTING UP THE OCR MAXIMUM GAIN The OCR has the receive and the transmit frequencies the same. The Gain range is 70 to 140dB in OCR mode.
The difference between the Tx power setting and the received “own” RSSI is the Antenna / system isolation. Unkey the OCR by setting PTT to OFF. Set the RSSI CAS Threshold to at least 10 dB higher than the measured “own” RSSI level (for example if the measured “own” RSSI level was -120dBm, set the RSSI CAS Th ON to -110dBm or higher). 8A535X01 Rev.
OCR FRONT PANEL INDICATORS The OCR 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 8A535X01 Rev. Preliminary-01 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.
OCR Specifications ELECTRICAL SPECIFICATIONS OCR VHF OCR UHF OCR 700 OCR 800 Frequency of Operation 136 – 174 380 – 512 764 – 806 806 – 960 MHz MHz MHz MHz Sensitivity -115 dBm -113 dBm Input Carrier Detection Threshold -115 to -80 dBm -113 to -80 dBm Carrier Detection Adjustment Step 1 dB Carrier Detection Attack Time <2 ms Max.
