Bi-Directional Amplifier System Part Numbers 48760 Operation and Installation Manual 200 Pond View Drive Meriden, CT 06450 U.S.A. Telephone (877) 737-9675 FAX (203) 821-3852 www.rfsworld.
DOC #: 602100022500 DOCUMENT TYPE: Operation and Installation Manual TITLE: REV: 0 PAGE 2 OF 17 Bi-Directional Amplifier System Proprietary Note: The information contained in this document is considered confidential material proprietary to Radio Frequency Systems and is solely for information purposes.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 3 OF 17 Bi-Directional Amplifier System TABLE OF CONTENTS GENERAL STATEMENTS .................................................................................................................................................... 4 MAXIMUM PERMISSIBLE EXPOSURE LIMITS ............................................................................. 5 PRODUCT OVERVIEW .......................................................
DOC #: 602100022500 DOCUMENT TYPE: Operation and Installation Manual TITLE: REV: 0 PAGE 4 OF 17 Bi-Directional Amplifier System General Statements Thank you for selecting this RFS product. We are confident that you will find this product in proper working order and meeting all stated specifications. If not, please contact customer service immediately at 1-800-321-4700 and we will resolve the issue without hesitation. Please read this manual.
DOC #: 602100022500 DOCUMENT TYPE: Operation and Installation Manual TITLE: REV: 0 PAGE 5 OF 17 Bi-Directional Amplifier System Maximum Permissible Exposure Limits THIS PRODUCT IS CATEGORICALLY EXCLUDED FROM ROUTINE ENVIRONMENTAL EVALUATION ACCORDING TO CFR 47, SECTION 1.1037. Signal repeaters like the 48760 bi-directional amplifier 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.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 6 OF 17 Bi-Directional Amplifier System Service antennas are also fixed mounted and covered by the same MPE considerations as the donor antenna. However, this assumes that the area is always general population/uncontrolled and that the minimum distance in most installations will be less than 3 feet. According to Table 1(B) of Section 1.1310, the power density at 894 MHz is 0.596 mW/cm2.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 7 OF 17 Bi-Directional Amplifier System Theory of Operation The 48760 BDA is designed to enhance radio communication in buildings; basements, tunnels and other RF shielded environments. The 48760 is a dual band BDA that will amplify both the 800 and 900 SMR as listed in the electrical specifications.
DOC #: 602100022500 DOCUMENT TYPE: Operation and Installation Manual TITLE: REV: 0 PAGE 8 OF 17 Bi-Directional Amplifier System Electrical Specifications 48760 Freq, MHz Freq, MHz Gain** Gain Flatness, typical** Manual Attenuator Range Output Limiter Range, Automatic* Noise Figure, typical** Composite Power, typical* Impedance VSWR, input Propagation Delay, worst case at band edge Power, 120/220 Auto Ranging, IEC-320 Socket 20 dB band width, typical Downlink 851-869 935-941 79 dB ±2.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 9 OF 17 Bi-Directional Amplifier System Intermodulation, Power, and AGC FCC requires that spurious emissions be less than {43+ 10 Log 10 (Power Out Watts)} dB below the carrier Power Out (dB) level. This is always equivalent to -13 dBm. The primary contributor to spurious emissions is multiple signal intermodulation. As multiple signals are amplified, they generate intermodulation products (IM).
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 10 OF 17 Bi-Directional Amplifier System AGC Automatic Shutdown If the attenuation capability of the AGC circuitry is exceeded, power to the power amplifier stage is shut down to prevent harmful distortion and potential damage to the 48760. Shutdown will occur if the AGC control limit is exceeded for about 1/2 second. Power is then cut for two seconds. After this timeout, power is brought back on-line.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 11 OF 17 Bi-Directional Amplifier System Installation WARNING Do not connect AC power until antennas have been connected to both the base and service area ports. Choose an optimal location. The choice of a location for the 48760 to reside is often dictated by circumstance. These units can withstand a wide range of environmental conditions, but a cooler environment will increase the life of the product.
DOC #: 602100022500 DOCUMENT TYPE: Operation and Installation Manual TITLE: REV: 0 PAGE 12 OF 17 Bi-Directional Amplifier System Connect the service area antennas to the “Service” port. Connect the donor antenna cable to "Base" port. Connect AC power to the unit and observe power and fault LEDs Ideally, a spectrum analyzer should be used to confirm the DL signal at the service port. However, the 48760 has diagnostics to assist with optimization as discussed below.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 13 OF 17 Bi-Directional Amplifier System Diagnostics/Troubleshooting Problem: Green power LED on faceplate not lit. Green power LED lit and no red Fault LED on faceplate; unit does not appear to be working. Yellow AGC LED on performance monitor is lit. Red LED on faceplate is lit. Checking DC Voltage Solution: Check power source and the AC fuse located in the EIC plug. Check for DC voltage (see below).
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 14 OF 17 Bi-Directional Amplifier System Detail of 487XX Faceplate Dsub Pins 1-8: Max sink/source = 15mA, output only. Accidental input max = 6.0 VDC 1. RX LNA Alarm, logic, low=fault 2. TX LNA Alarm, logic, low=fault 3. RX Converter fault, not used 4. TX Converter fault, not used 5. RX PA Alarm, logic, low=fault 6. TX PA Alarm, logic, low=fault 7. Temperature Alarm > +85 C, logic, low=fault 8.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 15 OF 17 Bi-Directional Amplifier System Pin 8 indicates that the unit is in automatic shutdown mode due to an overdrive that is exceeding the AGC’s range. The AGC is non-latching and will clear itself when the overdrive is removed. The alarm light will remain lit even though the shut down feature is powering on and off to check for the overdrive condition.
DOC #: 602100022500 DOCUMENT TYPE: Operation and Installation Manual TITLE: REV: 0 PAGE 16 OF 17 Bi-Directional Amplifier System Pins 12 and 13 are detector output voltages for the associated path. The DC voltage represents the output power. These voltages can be used to roughly estimate the amount of output power. For example, the donor antenna can be rotated to look for maximum output power if a spectrum analyzer is not available. Pin 14: Max sink = 1A. 14. Ground for Pins 10-13.
DOC #: DOCUMENT TYPE: Operation and Installation Manual TITLE: 602100022500 REV: 0 PAGE 17 OF 17 Bi-Directional Amplifier System Maintenance, Repair and Warranty Periodic Maintenance No periodic maintenance is required for the 48760. As long as the units are kept away from extreme temperatures and moisture, they should provide long-term, carefree operation. However, periodically check all RF connections for corrosion, strain damage, and proper tightness.
