Motorola STARLINE SERIES Provozní pokyny stáhnout pdf (Strana 18)

Overview 2-7

BLE*/* Installation and Operation Manual

Forward Path

The operational gain of the E-GaAs BLE*/* amplifiers is 28 dB or 32 dB (depending on model)

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 870 MHz 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

BLE*/* block diagram

Input

port

** ** ****

SFE

SCS

JXP-B

JXP-B RCB

PP PD

-20 dB

Manual

LDR

Auto

ADU/

TDU

-1.0 dB

24 dB -6.5 dB-1.0 dB

-1.0 dB

(~0.0 dB

with jumper)

RF/

Std Gain E-GaAs: 18 dB

High Gain E-GaAs: 23 dB

Return

injection point

-20 dB

Output

port

SRE

-16 dB

LPF

Therm

-20 dB

** **

ICS JXP

JXP-B

-20 dB

24 Vdc

DC test point

AC test

point

Power

supply

Fuse

Power

Block

Jumper

** Plug-in module

FTEC

-1.0 dB

-0.5 dB

+25.0 dB L

+30.0 dB H -0.3 dB

-0.4

-0.4 dB

RF/

-1.7 dB

FWD

-1.7 dB

FWD

-1.0 dB

RTN

-1.0 dB

RTN

OnBrd

tten

Status

monitor

BODE

Return Path

The circuit board of the BLE*/* accommodates the optional return path. The return path kit,

model RA-Kit/H or RA-Kit/L, includes the return amplifier hybrid (illustrated in Figure 2-8) and

jumpers. This equips the BLE*/* 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. All items are plug-in and easily installed.

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.

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