DTRA 900 GSM

Bidirectional Tower Mounted
Amplifier/Booster

 

DTRA 900 GSM

Bidirectional Tower Mounted
Amplifier/Booster

Features

  • Higher transmitting (down-link) and receiving (up-link) cell coverage

  • Higher base station receiver sensitivity

  • Longer mobile handset battery lifetime

  • Settable transmission output level (0 - 30 watts)

  • Visual display of Local Alarm and Antenna Reflexion

  • Intelligent PC based built-in signaling system

  • Versatile connection to Remote Management System

  • Power Supply from main voltage system

  • Easy installation, fast commissioning without base station modification

Description

DTRA 900 GSM is the 900 MHz band member of the equipment family developed by our partner in the 450 - 900 1800/1900 MHz bands. It expands the coverage area of the already existing 900 MHz base station using the existing equipment, cables and antenna. It is especially recommended for low output power base station equipment (Micro-BTS) where besides the increased sensitivity of the uplink branch it also provides a 20W transmitter output power instead of the typical 2W. When two high level RF channels are required the signals of two equipment can be combined using a cross-polarized antenna without raising the level of intermodulation.

The RF part is in a weather proof container between the coaxial cable and the antenna. There is a diplexer on each input (ANT, BTS) separating the signals in the Tx and Rx directions. DC power is supplied to the container through the inner conductor of the coaxial cable.

An indoor Power Supply and Alarm Cabinet (part of the DTRA 900 GSM) provide DC power through a bias-Tee DC separator. One indoor cabinet can supply two outdoor RF containers.

The transmission amplification can be set locally. A built-in test circuitry controls both the Tx and Rx branch operations visually displayed by the indoor Power Supply and Alarm Cabinet. Besides the main parameters the antenna reflection is also measured and displayed (VSWR monitoring). The status information of the main parameters are also put out to relay contact pins for outside remote management. If errors, high antenna reflexion or power supply outage occur the Tx or Rx branches immediately switch to bypass operation without any interrupt in the connection.

There is a PC connection possibility to provide an additional quantitative analysis for easy error location as well.

For more Photos on real installations go to services...

Technical data

- Type

DTRA 900 GSM

 

Frequency band
- Tx Band (BTS)
- Rx Band (BTS)
- Bandwidth

- Tx - Rx Distance

partial P-GSM band
935 - 960
890 - 915

8

45


MHz
MHz

MHz

MHz

No. of Tx Channels

1

 

Temperature range

- outdoor equipment
- equipment


-25...+55
0...+45


0C
0C

Storage Temperature

-35...+65

0C

MTBF

150 000

h

OUTDOOR EQUIPMENT

   

Tx Branch (BTS -> ANT)

   

Input Level Range

0,01 - 2
(10 - 33)

W
dBm

Max. Input Level with no error

5

W

Nominal Gain
(between ANT and BTS clamps)

14 - 12 - 10

dB

Control of Gain

2 - 4

dB steps, from outside

Control Accuracy

0,5

dB

Amplification Level Dependency

0,5

dB

Temperature Dependency
(In the entire temperature range compared to the normal
temperature range)

+1 / -2

dB

Output Shutdown Threshold Value


max. 30


W

Output Level to be Tuned

max. 20
(max. 43)

W
dBm
Note: amplification has to be set to the given input level

Fluctuation in Pass Band

max. 0.5

dB

Return Loss (BTS, ANT)

min. 16

dB

Tx Rx Separation

min. 65

dB

BYPASS Status Characteristics

   

Insertion Loss (BTS -> ANT)

max. 2,5

dB

Return Loss (BTS, ANT)

min. 16

dB

Rx Branch (ANT -> BTS)

   

Noise Figure
- in normal temperature range

- in extreme temperature range


max. 2
max. 2,5


dB
dB

Gain (ANT -> BTS)

14 1

dB

Fluctuation in Pass Band

max. 0.5

dB

Return Loss (ANT, BTS)

min. 16

dB

Group Delay Distortion

130 30

ns)

Third Order Intercept Point (IP3)
(measured on BTS output)

min. 20
tip. 27

dBm
dBm

Intermodulation Rejection
for ANT input as below:
1./ Rcvd Signal (ANT):-35 dBm
2./ Tx Signal (BTS): +30 dBm;

1./ Rcvd Signal (ANT):-35 dBm
2./ Rcvd Signal (ANT):-35 dBm;
1./ Tx Signal (ANT): +43 dBm
2./ Rcvd Signal (ANT):-35 dBm.


max. -115


dBm

BYPASS Status Characteristics

   

Insertion Loss (ANT ->BTS)

max. 2,5

dB

Return Loss (ANT, BTS)

min. 16

dB

Connector (on input and output)
- type
-
impedance


7/16 neg.
50



ohm

PC/Notebook interface

RS232 S

 

Power Supply

+30 1

V DC

Current Consumption

max. 4
tip. 3,5

A
A

Mechanical Construction
- size (without support assembly)
- weight
- installation


483 x 300 x 220
24


mm
kg
on horizontal or vertical pole of 110 max.

INDOOR EQUIPMENT

   

Temperature Range

0....+45

0C

DC and Signal Separator
(DC900/33)

   

RF Frequency

890 - 960

MHz

Insertion Loss

max. 0,3

dB

Return Loss

min. 25

dB

Output Power

max. 50

dBm

Current Load

max. 5

A

DC-RF Separation

min. 110

dB

Signaling Frequency

5,4 / 5,6

MHz

Connector Type
- to BTS
- to cable
- DC and signal input


7/16 pos.
7/16 neg.
XLR

 

Compact Size (without connectors)

35 x 60 x 103

mm

Weight

0,3

kg

     

Power Supply and Signal Cabinet
(DTRA-B)

   

No. of Supplied Outdoor Units

2

 

Local Alarm Signals

 

1./ Tx Branch Error (green
or red LED)
2./ Rx Error (green or red
LED)
3./ High Antenna Reflexion
(green LED row)

Information sent to Remote
Management

 

The above data led to
opening and/or closing
relay contacts)

PC/Notebook interface

RS 232 S

 

Power Supply Data

   

Input Voltage

230 10 %
50 / 60

V AC
Hz

Output Voltage

+30...+33

V DC (adjustable)

Mechanical Construction

 

Wall- or vertical plane-
mounted cabinet with
lockable door.

Compact size (H x W x D)

400 x 300 x 220

mm

Weight

10

kg

Manufacturer reserves the rights to make any technical data changes irrelevant to base specifications.


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