Operating instructions
Overview 2
22
2-
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9
BLE*/* Installation and Operation Manual
Figure 2-8 illustrates the interconnection among these components:
Figure 2-8
BLE*/* block diagram
Input
port
Output
port
**
**
** ** ** ****
H
L
SFE
or
SCS
JXP-T
**
SRE
-16 dB
JXP-T
LPF
BODERCB
**
Therm
PP
PD
-20 dB
TP
TP
-20 dB
**
**
**
** **
ICS JXP
JXP-T
**
Manual
**
LDR
H
L
Auto
24 Vdc
DC test point
Power
supply
Fuse
Power
block
jumper
** Plug-in module
FTEC
Surge
protector
TP
return
injection
point
-20 dB
**
Status
monitor
Surge
protector
On-board
attenuator
ADU/
TDU
-1.0dB
-1.0dB
-1.0dB
* see
chart -6.5dB-1.0dB
-1.0dB
-1.0dB
-0.5dB
+25.0dB L
+30.0dB H -0.3dB
-0.4dB
TP
-20 dB
-0.4dB-0.4dB
-1.0dB
(~0.0dB with
jumper)
RF
RF/
AC
AC
RF
RF/
AC
AC
-1.7
dB F
-1.0
dB R
-1.7
dB F
-1.0
dB R
* see
chart
BLE Model Input PP Output PD
870MHz E-GaAs +24dB + 18dB
870MHz High Gain +24dB + 20.5dB
750MHZ E-GaAs +24dB +18dB
750MHZ Silicon +23dB +18.5dB
*
Return Amplifier, RA-Kit/H or RA-Kit/L
The circuit board of the forward amplifier accommodates the optional return amplifier. The
return amplifier kit, model RA-Kit/H or RA-Kit/L, includes the return amplifier hybrid and
jumpers. The standard circuit board contains all components including the diplex filters with
extended return bandwidth for the amplifier input and output. All items are plug-in and easily
installed. The input and output of the return amplifier include two JXP-*T pad facilities. You
can also use either pad socket as a test point or a signal injection point. The output pad value is
normally selected to control the return signal level into the next upstream amplifier. Select an
appropriate input pad to attenuate excessive input signal.
The return-input test point and the return-output test point are directional couplers. Both test
points present 75-ohm source impedance and do not require special test probes.
Ingress Control Switch
The ingress control switch (ICS) module provides return-path signal attenuation or cutoff in the
BLE*/*. This is accomplished through the LIFELINE
®
status-monitoring module, LL-BLE-HMS.
(Figure 2-9 illustrates the location of the optional ICS). The ICS provides a means of isolating
sources of ingress from a centralized location. Using a downstream command through the