Forward Path; Figure 2-11 Power Passing Fuse Locations - Motorola STARLINE SERIES Installation And Operation Manual

Factory installed 20-amp fuses, illustrated in Figure 2-11, provide power passing to additional
amplifiers:
Figure 2-11
Power passing fuse locations
F in
MB 87 S
75 J
55 A
K
E
M
IN
FUSE
POWER
PORT 3
CONTROL
STATUS
MONITOR

Forward Path

The operational gain of all MB*/* models is 40 dB with 16 dB of return loss in the forward path.
The operating gain includes provisions for the insertion loss of the input cable equalizer and
required reserve gain to operate the Bode equalizer in the middle of its range.
The forward path's electronics consist of two parallel three-stage paths consisting of:
(1) pre-amplifier (input hybrid), (2) intermediate amplifier (midstage hybrid), and
(3) power-doubling output hybrid stage. The first two stages are common to both paths. The
pre-amplifier stage provides a low noise figure while the output stage contributes the preferred
power at low distortion. The amplifier input provides a facility to install a cable equalizer and a
socket for a model JXP-*B attenuator. The attenuator and equalizer are customer installed
options.
Several circuits comprise the intermediate amplifier stages. A flatness control circuit enables
optimization of the frequency response. The Bode equalizer is a voltage-controlled device that, in
the standard configuration, receives its input from the manual gain control. It also receives its
input from the automatic drive unit (ADU-*) or thermal drive unit (TDU-*) when either of these
options is employed.
-20dB
G
JXP
IN
MDR
H
FWD
L EQ
BODE
ALIGN DOTS
REF ER TO
MANUAL F OR
FUS E VALUE S
JXP
DRIVE
-20dB UNIT
MAN
JXP THERM
TDU
JXP
RTN
EQ
CAUTION:
CONTAINS PARTS
AND AS S EMBLIES
S US CE PTIBLE TO
DAMAGE BY
FUSE E LECTRO STAT IC
DISCHARGE (E SD)
F3 location
H
L
JXP 2
-20dB
JXP 3/4
JXP
ADU H L
MAN I
JXP 2 C
S
ADU
ADU 3
4
JXP 3/4
-20dB
-16dB
STATUS JXP
MONITOR COMMON
ASSEMBLED IN MEXICO
INPUT
MB*/* Installation and Operation Manual
Overview 2-9
F2
-20dB
STATUS
MONITOR
OUTPUT
PORT 2
FUSE
I
C
S
-20dB
FUSE PORT 4
F4