Directional Coupler Test Points; Bode Equalization - Motorola BLE Series Installation And Operation Manual

3-8 Amplifier Setup
Figure 3-4 illustrates BLE87* flatness and control ranges:
Figure 3-4
Typical flatness and control ranges
CH2 S 21 /M log MAG
BLE87S/12/G
1
PRm
C?
Del
14.7 dB P3-412 @870.0 MHz
START

Directional Coupler Test Points

Accurate −20 dB directional-coupler test points are available at the input and at the output of
the BLE*/*. Because these test points are 75-ohm source impedance, they do not require special
test probes.
After the output hybrid, a second directional coupler provides signal to the optional ADU board.
This signal is used only when the ADU board is installed. It is not necessary to terminate this
port when the ADU is not installed.

Bode Equalization

The Bode board, which is an electronically controlled equalizer, receives its control input from
either the ADU or TDU control boards. The response of the Bode board compensates for cable
attenuation changes due to temperature. If necessary, you can control the Bode board manually
using the potentiometer labeled Manual Level (
BLE*/* Installation and Operation Manual
1 dB/ REF 30.49 dB
2
52.000 000 MHz
MAN
25 Jun 2001 10:22:15
4: 30.757 dB
870.000 000 MHz
1: 30.434 dB
2: 30.306 dB
200 MHz
3: 30.394 dB
800 MHz
3
STOP 900.000 000 MHz
) in Figure 2-8.
52 MHz
4