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Mini-BDA OVERVIEW: 

 

The Mini-BDA assembly extends the coverage area of radio communications in 
buildings and RF shielded environments. The Mini-BDA has dual RF paths to extend 
coverage in two distinct frequency bands.    
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. 

 

Mini-BDA BLOCK DIAGRAM DESCRIPTION: 
 

Refer to Figure 1 for the following discussion. 

 

The Mini-BDA Downlink path receives RF signals from the base station and amplifies 
and transmits them to the subscriber. The Mini-BDA Uplink path receives RF signals 
from the subscriber and amplifies and transmits them to the base station. The Uplink 
and Downlink occupy two distinct frequency bands. For example, the PCS A 
frequency bands are as follows: 

1850-1865 MHz for the Uplink and 1930-1945 MHz 

for the Downlink.

  Two diplexers isolate the paths and route each signal to the proper 

amplifying channel. 

 

 
An Automatic Level Control (ALC) allows for output power limiting. A variable step 
attenuator gives 0 – 30 dB of attenuation in 2 dB steps. The use of these controls is 
covered in the “OPERATION” section, later in this document.  

 

Mini-BDA Options: 
 

The Mini-BDA can be used as a line amplifier. With an optional external bias-tee, the 
Mini-BDA will function with power coming from the In-building antenna. 

 

Optional External Bias-Tees 

 
 
 
 
 
 

 

 

 

 

(For .1/.1 Watt Models only)

An optional 9 pin D-sub connector is available for external alarm monitoring (See 
Figures 3 & 3a).  

 
 
 
 

 

Page 3 

Содержание BDA-1XXX-.X/.XW-XX-AX Series

Страница 1: ...INSTALLATION AND OPERATING MANUAL FOR BDA 1XXX X XW XX AX MINI BI Directional Amplifier ...

Страница 2: ...re 1 4 ELECTRICAL SPECIFICATIONS 5 FREQUENCY RANGES Table 1 6 SYSTEM SPECIFICATIONS Table 2 6 MECHANICAL CONNECTIONS 7 ENVIRONMENTAL CONDITIONS 7 Mini BDA CONNECTIONS 7 MECHANICAL OUTLINE DRAWING Figure 3 3a 8 RF EXPOSURE WARNING 9 Mini BDA INSTALLATION 10 Mini BDA OPERATION 11 MECHANICAL OUTLINE ADJUSTMENT Figure 4 12 DIAGNOSTICS GUIDE 13 Page 2 ...

Страница 3: ...m the subscriber and amplifies and transmits them to the base station The Uplink and Downlink occupy two distinct frequency bands For example the PCS A frequency bands are as follows 1850 1865 MHz for the Uplink and 1930 1945 MHz for the Downlink Two diplexers isolate the paths and route each signal to the proper amplifying channel An Automatic Level Control ALC allows for output power limiting A ...

Страница 4: ...Link MPA is a medium power amplifier with an ALC circuit which offers 40dB Gain High power amplifier with an ALC circuit which offers 40dB Gain for 1 2 Watt models 4 Up Link MPA is a medium power amplifier with an ALC circuit which offers 40dB Gain 5 Up Link Pre amp is a low noise amplifier that drives the Up Link MPA and offers 38dB Gain 6 Down Link Diplexer has low pass band insertion loss and h...

Страница 5: ...dB 2 dB steps Pass band Ripple 1 5 dB typical Noise Figure 25 C at max gain 3 0 dB max 3rd Order Intercept point See Table 2 Output Power 1dB Compression See Table 2 Isolation between Up Down Link 80 dB min 90 typical Input Output Impedance 50 Ohms VSWR Input Output 1 5 1 max Power Supply Local 15VDC 1 67 Amp 24VDC 1 88 Amp for 1 Watt Model 24VDC 3 Amp for 2 Watt Model Page 5 ...

Страница 6: ...att 70 dB Gain 72 72 39 39 27 26 18 18 5 1 Watt 70 dB Gain 72 72 39 44 27 31 18 22 5 2 Watt 70 dB Gain 72 72 39 46 27 36 18 27 1 1 Watt 60 dB Gain 61 61 34 34 20 20 11 11 1 5 Watt 60 dB Gain 61 61 34 40 20 27 11 18 5 5 Watt 60 dB Gain 61 61 40 40 27 27 18 18 5 1 Watt 60 dB Gain 61 61 39 44 27 31 18 22 5 2 Watt 60 dB Gain 61 61 39 46 27 36 18 27 The Manufacturer s rated output power of this equipme...

Страница 7: ...L approved The metal enclosure of the Mini BDA is connected to ground A 9 pin D Sub connector provides failure alarm output contacts The RF connections are made via two type N female connectors The RF connector labeled BASE must be connected to the antenna pointing towards the base station The RF connection labeled MOBILE must be connected to the antenna facing the area to be covered by the Mini B...

Страница 8: ...ni BDA Mechanical Outline COM N O Heat Sink included with 1 2 Watt Models Downlink Alarm Uplink Alarm Figure 3a Relay Shown in Non Alarm Condition The alarm monitors current of both uplink Conditions for Optional Alarm and downlink amplifiers An alarm condition N C will occur if either uplink or downlink amplifiers are under its current tolerance or if there is no DC power present Page 8 ...

Страница 9: ... 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 The indoor antenna omni directional must be installed so as to provide a minimum separation distance of 0 2 meters 20 cm between the antenna and persons within the area This assumes a typical wide beam type antenna with gain of...

Страница 10: ...onnect the cable from the donor antenna to the Mini BDA connector labeled BASE and the cable from the service antennas to the Mini BDA connector labeled MOBILE Note If used as a line amplifier connect the external bias tee between the service antenna cable and the Mini BDA connector labeled MOBILE with the RF DC side of the bias tee connected towards the service antenna cable 4 Connect the 2 5mm c...

Страница 11: ... panel of the Mini BDA and illuminates when the output power exceeds the ALC set point See below Downlink ALC Uplink ALC To establish proper operating gain on the Uplink and Downlink sides start with the Uplink Observe the red indicator lamp on the Uplink amplifier If the lamp is lit using the Uplink step attenuator reduce the gain until the lamp goes off Repeat the process for the Downlink The le...

Страница 12: ...Figure 4 0 0 16 2 1 4 1 3 6 4 1 2 10 8 2 0 2 2 24 2 6 2 8 0 3 0 16 6 4 2 1 2 1 0 1 4 1 8 20 22 26 2 8 8 Adjustment Access and Label Page 12 ...

Страница 13: ...s is given by the equation Isolation 92 5 20 Log F x D Gt Gr Where F frequency GHz D separation Km Gt transmit antenna gain in the direction of the receive antenna Gr receive antenna gain in the direction of the transmit antenna For the SMR frequencies the antenna isolation at 100 m separation is about 71 dB for omni directional antennas 0 dB gain To increase isolation the antennas should have hig...

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