INSTALLATION AND OPERATING MANUAL FOR BDA-PCS/X-1/1W-XX-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) 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 LNA LNA BLOCK DIAGRAM Page 4
ELECTRICAL SPECIFICATIONS: Frequency Range : See Table 1 Pass band Gain @ min attenuation : 65 dB or 80 dB minimum Variable Step Attenuator Range (2-dB steps) : 0-30 dB Pass band Ripple : ±1.5 dB typical Noise Figure @+25°C at max gain : 5.
Table 1 Frequency Band Downlink Frequency Ranges Uplink Frequency Ranges PCS A PCS B PCS C PCS C-1 PCS C-2 PCS C-3 PCS C-4 PCS C-5 PCS D PCS E PCS F 1930-1945 MHz 1950-1965 MHz 1975-1990 MHz 1982.5-1990 MHz 1975-1982.5 MHz 1975-1980 MHz 1980-1985 MHz 1985-1990 MHz 1945-1950 MHz 1965-1970 MHz 1970-1975 MHz 1850-1865 MHz 1870-1885 MHz 1895-1910 MHz 1902.5-1910 MHz 1895-1902.
MECHANICAL SPECIFICATIONS: Size : 11.2 x 9.7 x 6.0 inch : (284.5 x 246.4 x 152.4 mm) RF Connectors : N-type Female Weight : 13.5 Lbs. (6.2kg.) 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 Page 8
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 (Figure 3). 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.
Figure 3 DOWNLINK 0 30 ON OFF DOWNLINK ALC Adjustment Access Panel and Label 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.
