INSTALLATION AND OPERATING MANUAL FOR BDA-CELLB-2/2W-80-OCA OUTDOOR REPEATER
TABLE OF CONTENTS PARAGRAPH PAGE NO BDA OVERVIEW BDA BLOCK DIAGRAM DESCRIPTION OPTIONAL EQUIPMENT OVERVIEW BDA BLOCK DIAGRAM DRAWING (Figure 1) ELECTRICAL SPECIFICATIONS MECHANICAL SPECIFICATIONS ENVIRONMENTAL CONDITIONS BDA CONNECTIONS MECHANICAL OUTLINE DRAWING (Figure 2) ALARM CONFIGUATION (Figure 3) ALARM LED CONFIGUATION (Figure 4) RF EXPOSURE WARNING BDA INSTALLATION BDA OPERATION VARIABLE GAIN ADJUSTMENT ALC ADJUSTMENT DIAGNOSTICS GUIDE Page 2 3 3 3 4 5 6 6 6 7 8 8 9 10 11 12 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 CIRCUIT DESCRIPTION: Refer to figure 1 for the following discussion.
Figure 1 1. 2. 3. H 6. 4. 5. BDA Block Diagram 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 HPA and offers 46dB Gain 3. Down-Link HPA – is a high 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. Up-Link Pre-amp - is a low noise amplifier that drives the Up-Link MPA and offers 46dB Gain 6.
ELECTRICAL SPECIFICATIONS: Frequency Range Downlink Uplink : 880-894 MHz : 835-849 MHz Pass Band Gain @ min attenuation : 80 dB (min.) Variable Step Attenuator Range (2-dB steps) : 0-30 dB Pass band Ripple : ±1.5 dB (typ) Noise Figure @+25°C at max gain : 4.0 dB max.
MECHANICAL SPECIFICATIONS: Size : 16.0 x 12.0 x 8.75 inch (406 x 305 x 222 mm) Weight : 35 Lbs. (16.0kg.) approx. ENVIRONMENTAL CONDITIONS: The unit is designed for outdoor applications: Operating temperature: - 40°C to + 60°C Storage temperature: - 50°C to + 90°C BDA CONNECTIONS The BDA AC power is accepted through a 3-wire male plug with phase, neutral and ground leads. The AC power is wired to a high efficiency DC switching power supply which is CE and UL approved.
Figure 2 CELL B OUT DOOR 2 WATT REPEATER BDA Mechanical Outline Page 7
Figure 3 Alarm Test Switches Downlink Test Switch Uplink Test Switch The BDA has two momentary test switches to verify the alarm function. When the uplink or downlink test switch is depressed the alarm boards uplink or downlink failure LED will illuminate. Figure 4 Alarm Board Amplifier Status LEDs Green LED-System OK Red LED – Uplink Fail Red LED –Downlink Fail The alarm monitors current of both uplink and downlink amplifiers.
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).
OUTDOOR BDA INSTALLATION PROCEDURE IMPORTANT: DO NOT APPLY A.C. OR DC 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 six 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.
BDA OPERATION 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. 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 4 Variable Gain Adjustment Access DOWNLINK UPLINK 0 30 0 30 Up-Link MGC Down-Link MGC Alarm Board and Momentary test switches Down-Link MPA ALC circuit inside Up-Link MPA ALC circuit inside AC Power Surge Protection Figure 5 ALC Adjustment Access UPLINK OFF ON ALC DOWNLINK OFF ON ALC 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.
