Forward Path; Return Path; Figure 2-7 Ble100 Block Diagram - Motorola BLE100 Installation And Operation Manual

Forward Path

The operational gain of the BLE100 amplifiers is 34 dB with 16 dB of return loss. 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 low-noise figure, pre-amplifier
stage, is a 1 GHz hybrid followed by a power-doubled output stage. Between the two stages is a
JXP-*B pad socket, the Bode board, and the flatness and equalizer board. Because these losses
are located interstage, the noise figure is only significantly impacted by the insertion loss of the
forward cable equalizer or broadband cable simulator, and the input pad if its value is increased
from zero.
Figure 2-7 illustrates the interconnection among these components:
Figure 2-7
BLE100 block diagram
-1.0 dB
SFE
-20 dB
or
TP
SCS
Input
port -1.7
H
RF/
-1.0 dB
dB F
AC RF
-1.0 -1.0 dB
AC L
dB R
-0.4 dB
TP
-20 dB

Return Path

The circuit board of the BLE100 includes the return path. This equips the BLE100 to pass
signals in the return or upstream direction. The standard circuit board contains all components
including the diplex filters with extended return bandwidth for the amplifier input and output.
Optional SRE-*-* return equalizers compensate for cable attenuation and are available in 1 dB
increments for S-split, and 2 dB increments for all other splits, from 0 dB through 12 dB.
28 dB ~ -3 dB -1.0 dB
OnBrd
JXP-B PP JXP-B RC
Atten
Manual
+30.0 dB -0.3 dB
-0.5 dB
Surge
JXP-B -
SRE Therm
protector
AC test
Power
point
supply
Power
Block Fuse
Jumper
FTEC
-6.5 dB 23 dB
LDR BODE PD
Auto
OnBrd
ADU/
JXP-B
TDU
Atten
Status
monitor
-0.4 dB
LPF ICS JXP
protector
-16 dB
24 Vdc
DC test point
** Plug-in module
BLE100 Installation and Operation Manual
Overview 2-7
Output
-1.7
port
H
RF/
-1.0 dB dB F
RF AC
-1.0
-1.0 dB
L AC
dB R
TP
Return
injection point
JXP-B
-20 dB
-0.4 dB
Surge
TP
-20 dB