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

3 3 3 3 - - - - 8 8 8 8 A m p l i f i e r S e t u p
Figure 3-4 illustrates BLE87* flatness and control ranges:
F i g u r e 3 - 4
T y p i c a l f l a t n e s s a n d c o n t r o l r a n g e s
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
B L E * / * I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l
1 dB/ REF 30.49 dB
2
52.000 000 MHz
in Figure 2-9.
MANUAL LEVEL
25 Jun 2001 10:22:15
4: 30.757 dB
870.000 000 MHz
1: 30.434 dB
52 MHz
2: 30.306 dB
200 MHz
3: 30.394 dB
800 MHz
3
STOP 900.000 000 MHz
4