INSTALLATION AND OPERATING MANUAL FOR RBDA-PCS-1/25W-90-A INDOOR REPEATER
TABLE OF CONTENTS PARAGRAPH PAGE NO BDA OVERVIEW BDA BLOCK DIAGRAM DESCRIPTION FCC INFORMATION FOR USER BDA BLOCK DIAGRAM DRAWING (Figure 1) ELECTRICAL SPECIFICATIONS FREQUENCY TABLE MECHANICAL SPECIFICATIONS ENVIRONMENTAL CONDITIONS BDA CONNECTIONS MECHANICAL OUTLINE DRAWING (Figure 2) BDA INSTALLATION RF EXPOSURE WARNING BDA OPERATION VARIABLE GAIN ADJUSTMENT (Figure 3) BACK PANEL (Figure 4) DIAGNOSTICS GUIDE Page 2 3 3 3 4 5 6 7 7 7 8 9 9 10 11 11 12
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. 6. 7. 4. 5. BDA Block Diagram 1. Uplink Diplexer - has low bandpass insertion loss and high selectivity 2. Downlink Pre-amp - is a low noise amplifier that drives the Downlink PA and offers 46dB Gain 3. Downlink PA – is a power amplifier with an ALC circuit which offers 43dB Gain 4. Uplink MPA – is a medium power amplifier with an ALC circuit which offers 43dB Gain 5. Uplink Pre-amp - is a low noise amplifier that drives the Uplink MPA and offers 46dB Gain 6.
ELECTRICAL SPECIFICATIONS: Frequency Range : See Table Pass Band Gain @ min attenuation : 90 dB (typ.) Variable Step Attenuator Range (2-dB steps) : 0-30 dB Pass band Ripple : ±1.5 dB (typ) Noise Figure @+25°C at max gain : 5.0 dB max. 3rd Order Intercept point Uplink Downlink : +45 dBm (typ) : +55 dBm (typ) *Output Power @ 1dB Compression Uplink Downlink : +33 dBm (typ) : +44 dBm (typ) *Maximum Output power per Carrier Uplink Single Carrier Two Carriers Three Carriers : +25.0 dBm : +20.
Table 1 Frequency Band Downlink Frequency Ranges Uplink Frequency Ranges PCS A PCS B PCS C PCS D PCS E PCS F 1930-1945 MHz 1950-1965 MHz 1975-1990 MHz 1945-1950 MHz 1965-1970 MHz 1970-1975 MHz 1850-1865 MHz 1870-1885 MHz 1895-1910 MHz 1865-1870 MHz 1885-1890 MHz 1890-1895 MHz * Other contiguous or non contiguous blocks are available upon request (Example: PCS AD, PCS EF…, AC, BE etc) Page 6
MECHANICAL SPECIFICATIONS: Size : 19.0 x 13.0 x 5.25 inch (483 x 330 x 133 mm) Weight : 30 Lbs. (13.6kg.) approx. ENVIRONMENTAL CONDITIONS: The unit is designed for outdoor 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 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 BASE MOBILE GND ALARM DL ALC DL ALC UL ALARM UL IN BUILDING REPEATER PCS/A POWER 0...30 dB Gain Adjustment UPLINK 0...
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 structure with the RF connectors pointing DOWN. Using appropriate screws and anchors, attach the BDA to the structure using 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 3 Variable Gain Adjustment Access Downlink ALC & Alarm LED’s Uplink ALC & Alarm LED’s Power Switch & Indicator UPLINK DOWNLINK 0 30 0 30 Figure 4 Back Panel AC Line IN BASE & MOBILE Connectors Page 11 Ground Lug
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 or RF connections to antennas, damaged antennas. b. Excessive Intermodulation or Spurious Possible causes: Amplifier oscillation caused by insufficient isolation.
