INSTALLATION AND OPERATING MANUAL FOR BDA-XXX-1/1W-80-B BI-DIRECTIONAL AMPLIFIER
TABLE OF CONTENTS PARAGRAPH PAGE NO BDA OVERVIEW BDA BLOCK DIAGRAM DESCRIPTION BDA BLOCK DIAGRAM DRAWING (Figure 1) ELECTRICAL SPECIFICATIONS FREQUENCY RANGES (Table 1) MECHANICAL SPECIFICATIONS ENVIRONMENTAL CONDITIONS BDA CONNECTIONS MECHANICAL OUTLINE DRAWING (Figure 2 & 2a) RF EXPOSURE WARNING BDA INSTALLATION BDA OPERATION MECHANICAL OUTLINE- ADJUSTMENT (Figure 3) DIAGNOSTICS GUIDE Page 2 3 3 4 5 6 7 7 7 8 9 10 11 12 13
BDA OVERVIEW: The BDA assembly extends the coverage area of radio communications in buildings and RF shielded environments. The unit features low noise figure and wide dynamic range. It is based on a duplexed path configuration with sharp out of band attenuation allowing improved isolation between the receiving and transmitting paths. BDA BLOCK DIAGRAM DESCRIPTION: Refer to figure 1 for the following discussion.
Figure 1 1. 2. 3. 6. 4. 5. BDA BLOCK DIAGRAM BDA-XXX-1/1W-80-A 1. Up-Link Diplexer - has low bandpass insertion loss and high selectivity 2. Down-Link Pre-amp - is a low noise amplifier that drives the Down-Link MPA and offers 45dB Gain 3. Down-Link MPA – is a medium power amplifier with an ALC circuit which offers 43dB Gain 4. Up-Link MPA – is a medium power amplifier with an ALC circuit which offers 43dB Gain 5.
ELECTRICAL SPECIFICATIONS: Frequency Range : See Table 1 Pass band Gain @ min attenuation : 80 dB minimum Variable Step Attenuator Range (2-dB steps) : 0-30 dB Pass band Ripple : ±1.5 dB (typ) Noise Figure @+25°C at max gain : 5.
Table 1 Frequency Frequency Bands Ranges Downlink SMR CELL A CELL B CELL AB GSM F GSM H GSM L NPS PAC 2PG 2PGN PS8 PS9 851-866 MHz 869-880 MHz 880-894 MHz 869-894 MHz 935-960 MHz 947-960 MHz 935-947 MHz 866-869 MHz 929-942 MHz 929-942 MHz 851-869 MHz 935-941 MHz Page 6 Frequency Ranges Uplink 806-821 MHz 824-835 MHz 835-849 MHz 824-849 MHz 890-915 MHz 902-915 MHz 890-902 MHZ 821-824 MHz 898-904 MHz 900-903 MHz 806-824 MHz 896-902 MHz
MECHANICAL SPECIFICATIONS: Size : 13.5 x 12.5 x 5.6 inch : (343 x 317.5 x 142.3 mm) RF Connectors : N-type Female Weight : 17.8 Lbs. (8.1kg.) approx. ENVIRONMENTAL CONDITIONS: The unit is designed for indoor applications: Operating temperature: - 20°C to + 50°C Storage temperature: - 50°C to + 90°C BDA CONNECTIONS The BDA AC power is accepted through a standard 3-wire male plug (IEC-320) with phase, neutral and ground leads.
Figure 2 IN BUILDING REPEATER BDA Mechanical Outline Figure 2a (Relay Shown in Non-Alarm Condition) Optional Alarm Conditions The alarm monitors current of both uplink and downlink amplifiers. An alarm condition will occur if either uplink or downlink amplifiers are over or under its current tolerance. N.C. . COM. N.O.
RF EXPOSURE WARNING In order to satisfy the FCC RF exposure requirements, the BDA/antenna installation must comply with the following: The outdoor antenna (Yagi type or similar directional antenna) must be installed so as to provide a minimum separation distance of 0.3 meters (30 cm) between the antenna and persons within the area. (This assumes a typical antenna with gain of [10.1 dBi, VSWR ≤ 1.5:1, Zo= 50 ohms, and a cable attenuation of between 1-10 dB).
BDA INSTALLATION DO NOT APPLY A.C. POWER TO THE BDA UNTIL CABLES ARE CONNECTED TO BOTH PORTS OF THE BDA AND THE ANTENNAS. 1. Mount the BDA on the wall with the RF connectors pointing DOWN. Using appropriate screws and anchors, attach the BDA to the wall at the four mounting holes on the side flanges. 2. Ensure that the isolation between the donor antenna and the service antenna is at least 12 dB greater than the BDA gain. (Use the higher of the Uplink and Downlink gains reported on the BDA test data sheet).
BDA OPERATION Refer to figure 3 for adjustment access location and label. Variable Step Attenuator BDA gain can be reduced by up to 30 dB in 2 dB steps using the variable step attenuator. Gain adjustment is made with rotary switches accessible via the access door on the BDA enclosure. Arrows on the shafts of these switches point to the value of attenuation selected. BDA gain can be determined by subtracting the attenuation value from the gain reported on the BDA Test Data Sheet for that side of the unit.
Figure 3 UPLINK 0 30 UPLINK OFF ON ALC Adjustment Access Panel and Label (Downlink’s access panel has the same configuration) Page 12
DIAGNOSTICS GUIDE The BDA provides long term, care-free operation and requires no periodic maintenance. There are no user-serviceable components inside the BDA. This section covers possible problems that may be related to the installation or operating environment. a. Gain Reduction Possible causes: Bad RF cables and RF connections to antennas, Damaged antennas. b. Excessive Intermodulation or Spurious Possible causes: Amplifier oscillation caused by insufficient isolation.
