Diamond Line Amplifiers 10 July 2000 35
Forward RFSignalFlow Before Main & Secondary Paths Split
Input Port (J1). The input port, J1, routes forward incoming
signal to the amplifier. (This port also routes outgoing return
signal to the main cable.)
Refer to Figure11 as you
read the descriptions in this
section.
Input Test Point. The input test point is a -20 dB directional
coupler. Accessible through a cut-out in the module cover,
this test point lets you verify the forward signals at the
forward input port(J1) without interrupting the amplifier’s
operation. (Return signal cannot be measured here.)
Input Diplex Filter. A diplex filter consists of a pair of filters, a
high-pass and a low-pass, isolating forward and return bands.
The high-pass filter passes forward signals but blocks return
signals and AC. The low-pass filter passes return signals but
blocks forwardsignals.
Amplifiers are shipped with
the input attenuator and
input equalizer positions
empty; you must plug both
circuits in for the amplifier to
work.
Input Attenuator. A 9-A-WC or 10-A-WC series plug-in
attenuator reduces RF levels at the pre-amp input to meet
design specifications. Amplifiers are shipped with the input
attenuator position empty. Select and install the appropriate
value based on the amplifier’s location in your network.
Input Equalizer. The 7-2E-WC series plug-in equalizer
compensates for the effects of cable precedingthe amplifier
module. Amplifiers are shipped with the input equalizer
position empty. Select and install the appropriate value based
on the amplifier’s location in your network.
Pre-Amplifier. A push-pull input hybrid provides gain. This
pre-amplifier sets the amplifier’s noise figure.
Interstage Attenuator. A 9-A-WC or 10-A-WC series
interstage attenuator reduces overall amplifier gain. A “zero”
attenuator is shipped in this slot for circuit continuity.
ALSC Bode Equalizer (factory-installed). The ALSC Bode
equalizer works with the ALSC Bode controller to maintain a
constant RF output level, compensating for the effects of
outside temperature changes on cable.
Response Equalizer. An EDB series response equalizer
(debumper) flattens the forward response of cascaded
amplifiers, compensating for system signature imperfections.
A jumper is shipped in this slot for circuit continuity.
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