USERS MANUAL For 48750 Series Cellular Repeater 200 Pondview Drive, Meriden, CT 06450 877 737-9675, Fax 203 821-3852, www.rfsworld.
Copyright 1993-Radio F requency Systems-All rights reserved.
Disclaimer All information and statements contained herein are accurate to the best of the knowledge of Radio Frequency Systems, but Radio Frequency Systems does not make any warranty with respect thereto, including without limitation any results which may be obtained from the products described herein or the infringement by such products of any proprietary rights of any persons.
USER’S MANUAL SERIES 48750 RF REPEATER AMPLIFIERS TABLE OF CONTENTS General Statements -------------------------------------------------------------------------------------- --------1 MPE Statement --------------------------------------------------------------------------------- 1 Field Alignment Statement ------------------------------------------------------------------- 2 FCC and DOC Certification----------------------------------------------------------------- 2 Product Overview and General Informati
USER’S MANUAL SERIES 48750 RF REPEATER GENERAL STATEMENTS MAXIMUM PERMISSIBLE EXPOSURE LIMITS THIS PRODUCT IS CATAGORICALLY EXCLUDED FROM ROUTINE ENVIRONMENTAL EVALUATION ACCORDING TO CFR 47 SECTION 1.1307. Repeaters like the 48750 generate radio signals and thereby give rise to electromagnetic fields. The installer is expected to have a complete understanding of CFR Title 47 sections 1.1307 and 1.1310. A brief discussion follows but is not intended to be a substitute.
USER’S MANUAL SERIES 48750 RF REPEATER mW per cm2. A higher level is specified for controlled areas in 1.1310 table 1 (A). Using a 10 dB gain yagi antenna (typical in about 80% of installations) and assuming the uplink is being driven to its maximum output power (+30 dBm), the resultant ERP is +40 dBm or 10,000 mW. OET Bulliten 65 provides the formula below for calculating the power density with the EPA reccomended factor for ground relfection: 1.
USER’S MANUAL SERIES 48750 RF REPEATER IWD 48750 XXXX XXXX PRODUCT OVERVIEW and GENERAL INFORMATION The 48750 series band specific Cellular Repeaters are designed to enhance radio communications in buildings, basements, tunnels and other RF shielded environments. The 48750 is tuned for A band only operation, the 48751 is tuned for B band only. These units work by receiving and amplifying the Base TX signals via a donor antenna directed at desired base site. This RF path is called the ‘downlink”.
USER’S MANUAL SERIES 48750 RF REPEATER ELECTRICAL / MECHANICAL SPECIFICATIONS SPECIFICATIONS 48750 Frequency, MHz 48751 Frequency, MHz Gain, no Attenuation, Typ. Gain Flatness, Typ. Manual Attenuator Range Output Limiter Range, automatic* Noise Figure, Typ. Composite Power** CDMA, TDMA Downlink 869-880 / 890-891.5 880-890 / 891.5-894 79 dB ±1.0 dB 15 dB 20 dB 9.0 dB +30 dBm +27 dBm Uplink 824-835 / 845-846.5 835-845 / 846.5-849 79 dB ± 1.0 dB 15 dB 20 dB 9.
USER’S MANUAL SERIES 48750 RF REPEATER INTERMODULATION PRODUCTS, AGC, AND OUTPUT POWER A general requirement exists within 47 CFR 90, Subpart I and 47 CFR 22, Subpart K regarding emissions outside of any particular channel of operation. As a general rule, there shall be no spurious emissions greater than {43 + 10 Log10 (Power Out watts)} dB below the carrier Power Out (dB) level. This is always equivalent to a fixed level of -13 dBm maximum spurious emission.
USER’S MANUAL SERIES 48750 RF REPEATER its limit include the presence of one or more very strong channels, a strong in-band noise source, amplifier oscillation, etc. INSTALLATION ISSUES ANTENNA ISOLATION Proper implementation of the antennas is absolutely crucial to the repeater system. Several important issues must be considered when selecting and implementing the antennas. The most important consideration, besides the obvious concerns for gain and area of coverage, is the antenna isolation.
USER’S MANUAL SERIES 48750 RF REPEATER INSTALLATION PROCEEDURE Review this entire manual Do not apply power until antennas have been connected to botht eh base and service area ports ! Install donor antenna, aligned with desired base site and measure base signal strength.
USER’S MANUAL SERIES 48750 RF REPEATER DIAGNOSTICS A green power LED will light up when AC power is supplied. If this fails, check power source and the the AC fuse located in the EIC plug. If the power source and fuse are OK then the internal switching power supply has failed and will need replacement. The Red LED indicates a summary fault from any of the fault conditions identified in the Test Points section. Specific action is describe in that section.
USER’S MANUAL SERIES 48750 RF REPEATER MAINTENANCE, REPAIR, AND WARRANTY PERIODIC MAINTENANCE There is no maintenance for the 48750. As long as the amplifiers are kept away from extreme temperatures and moisture, the amplifier should provide long-term, care-free operation.
USER’S MANUAL SERIES 48750 RF REPEATER THIS WARRANTY IS IN LIEU OF ALL OTHERS, EITHER EXPRESSED OR IMPLIED. No representative is authorized to assume for the Seller any other liability in connection with the Seller's products. Dwg xxxxx / Rev.
