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USERS MANUAL
48710 and 48722
Bi-Directional Amplifiers
200 Pondview Drive, Meriden, CT 06450
877 737-9675, Fax 203 821-3852, www.rfsamericas.com
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Table of Contents
Summary of Contents for Radio Frequency Systems 48710
- Page 1 USERS MANUAL 48710 and 48722 Bi-Directional Amplifiers 200 Pondview Drive, Meriden, CT 06450 877 737-9675, Fax 203 821-3852, www.rfsamericas.com...
- Page 2 Product material and specifications are subject to change without notice. All sales of the products described herein are subject to Radio Frequency Systems’s standard terms of sale and the specific terms of any particular sale.
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Page 3: Table Of Contents
USER’S MANUAL SERIES 48750 RF REPEATER AMPLIFIERS TABLE OF CONTENTS General Statements---------------------------------------------------------------------------------- --------1 Product Overview ----------------------------------------------------------------------------------- --------3 Theory of Operation ----------------------------------------------------------------------- 3 Block Diagram------------------------------------------------------------------------- 3 Electrical and Mechanical Specifications ----------------------------------------------- 4 Outline of Face Plate------------------------------------------------------------------ 4 Intermod, Output Power and AGC ------------------------------------------------------ 5 Table 1. -
Page 4: General Statements
USER’S MANUAL SERIES 48750 RF REPEATER ’ ’ • • • • • • Donor Antenna iiDwg 602300003500/Rev.1... - Page 5 USER’S MANUAL SERIES 48710 RF REPEATER “ ” “ ” 48710-22Manual.doc...
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Page 6: Product Overview
FIELD TUNE-UP, ALIGNMENT OR CALIBRATION The 48710 series repeaters are aligned and calibrated at the time of manufacture. These units are designed to retain this calibration for the useful life of the product. There is no field tune-up or alignment necessary. -
Page 7: Theory Of Operation
LNA stage. Overdrive limiting is provided by the AGC circuitry and set at the factory and so that the 48710 series will not exceed the FCC limits for spurious emissions The control board distributes DC power to the amplifier modules and monitors each module for any fault condition. - Page 8 USER’S MANUAL SERIES 48750 RF REPEATER ± ± ± ± < < , IEC-320 Socket ° ° INTERMOD, POWER , AND AGC A requirement exists within 47 CFR 90, 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.
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Page 9: Table 1. Typical Output Power
Table 4 lists the typical output power per signal which can be expected from the 48710 for a given number of active signal operating at equal input levels. For a donor site that has 16 signals, the full power per signal would be +14 dBm. -
Page 10: Ac/Dc Power
USER’S MANUAL SERIES 48750 RF REPEATER N um ber of Si gnal s 30. 0 1000 26. 0 22. 0 18. 0 14. 0 10. 0 6. 5 – – – – AGC AUTOMATIC SHUTDOWN When the automatic gain control circuit reaches its limit (20 dB), the power amplifier stage is shut down to prevent harmful distortion and potential damage to the repeater. - Page 11 Check the incoming signal before connecting. The 48710 will work with a wide range of RF input signal levels. Ideal levels on the down link are in the range of –70 dBm. These levels will provide the maximum output power while not causing significant ovedrive.
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Page 12: Antenna Isolation
USER’S MANUAL SERIES 48750 RF REPEATER ANTENNA ISOLATION ISOLATION BETWEEEN THE DONOR (BASE) ANTENNA AND SERVICE AREA ANTENNA SHOULD BE 20 dB GREATER THAN THE GAIN OF THE REPEATER AMPLIFIER. If the isolation is less than the amplifier gain, then positive feedback sufficient for oscillation is present in the system. Such oscillations will overdrive one or both amplifier chains and continuously activate the AGC auto-shutdown circuitry. -
Page 13: Periodic Maintenance
MAINTENANCE, REPAIR, AND WARRANTY PERIODIC MAINTENANCE There is no maintenance for the 48710. As long as the amplifiers are kept away from extreme temperatures and moisture, the amplifier should provide long-term, care-free operation. However, as a system periodically check all RF connections for corrosion, strain damage, and tightness and periodically check the AC power connections for integrity. - Page 14 Send components or units freight-paid with the Return Authorization Number on the outside of the package to: Radio Frequency Systems 4100 S.W. Research Way Corvallis, Oregon 97333 LIMITED WARRANTY The Seller warrants that, at the time of shipment, the products manufactured by the Seller are free from defects in material and workmanship.