User Manual

4.8. Bi-Directional Amplifier (17-017301)
This module is a Bi-Directional Amplifier (up-link and down-link). All the amplifier stages are of
balanced type and there is additionally digital attenuation, automatic level control (ALC) in the uplink
path and also Current Fault Alarm Function circuitry, which indicates failure of each RF transistor in
various ways – open collector, closed collector (TTL) and a relay to indicate the failure by voltage free
change over contacts.
The module is housed in an aluminium case (Iridite NCP finish) with SMA connectors for the RF
input/output and a D-type connector for power supply and Current Fault Alarm Function.
Specification 17-017301
PARAMETER SPECIFICATION
Frequency Range MHz 380-430
Gain 64 - 66 dB
Gain Flatness 2.0 dB
ΔGain vs. Temp.
2.5 dB Max
ALC dynamic Range  28 dB Min
ALC o/p power level 29 ± 0.5 dBm Min
Input Return Loss  15 dB Min
Output Return Loss  18 dB Min
P1dB  30 dBm Min
OIP3  41 dBm Min
Noise Figure  1.7 dB Max
DC Supply 9.0V ± 0.5 at 1120 mA Max
Max RF Input +15dBm
Storage temperature -40 to +100 ºC
Operating temperature -20 to +70 ºC
Dimensions 291.0 x 165.6 x 28.5 mm
15-Way Pin-Out Graphical Representation
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15
BDA ‘D’ Connector Pin-out details
Connector pin Signal
1 +ve input (9V)
2 +ve input (9V)
3 GND
4 GND
5 Alarm relay good
6 Alarm relay common
7 Alarm relay O/P bad
8 Attenuator In
9 Detector Out
10 Digital Attenuator Bit 1
11 Digital Attenuator Bit 2
12 Digital Attenuator Bit 3
13 Digital Attenuator Bit 4
14 Not Used
15 Not Used
UHF Bandselective BDA
90dB 40/5W
Document Number 55-199102HBKM Issue No. 1 Page 17 of 28