Operating instructions

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8 Overview
BLE*/* Installation and Operation Manual
The factory-installed 20-ampere fuse, illustrated in Figure 2-9, provides power-passing to
additional line extenders.
Power Factor Corrected Power Supply
The PFC power supply is offered as a configured option in the BLE*/*. The PFC design lowers
the current draw of the amplifier and improves power supply efficiency for the entire system.
Information provided in the previous subsection, Standard Power Supply, is applicable to the
PFC. R14 is the on-board 24 V adjustment which is set at the factory and should not require
correction in the field.
Figure 2-7 illustrates the components on the PFC power supply circuit board:
Figure 2-7
BLE*/* PFC power supply
SU RGE PROTECT OR
90V
60V
C17
C22
D2
U1
C10
C12
D4
C9
C6
C8
U2
R1
U5
C7
D10
C19
D5
D4
D7
Q2
Q3
Q1
R7
L3
L4
U3
C27
C15
D3
C4
C24
C11
C25
C16
C14
C3
U4
T2
T1
C1
C2
D8
R14
D1
F1
L1
C23
C28
J1
C26
C18
Surge protector
or FTE
C
LO/HI
selecto
r
R14
Forward Amplifier
The operational gain of the 750 MHz silicon version is 29 dB with 15 dB of return loss. The
870 MHz silicon version achieves 30 dB operational gain with a return loss of 15 dB. All E-GaAs
BLE*/* amplifiers achieve 28 dB of gain 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
conventional 750 MHz (BLE75*) or 870 MHz (BLE87*) hybrid followed by a power-doubled
output stage. Between the two stages is a JXP-*T pad socket, the Bode board, and the flatness
and equalizer board. Because these losses are located interstage, the noise figure is only
impacted by the insertion loss of the forward cable equalizer or a broadband cable simulator.