PHC-12G
7
Rev. 06/03
Ph: 800-421-6511
www.picomacom.com
Installation Procedure
Installation
It is recommended that assistance be available to safely install equipment
in equipment racks. Chassis must be fastened securely in equipment rack
before populating with modules.
1.
Install chassis in equipment rack (equipment rack sold separately) by
supporting the bottom and rear of the
PHC-12G
at the desired
elevation in rack.
2.
Line up the side holes of chassis with the tapped equipment rack
holes.
3.
Insert the provided screws through the side holes in chassis and
thread into the tapped equipment rack holes.
4.
Fasten the bottom screws first, then fasten top screws (tighten
securely).
5.
Connect cables from the output of channel sources (modulators,
processors, strip amplifiers, etc.) to the input connections of the
PHC-12G
.
6.
Connect a cable from the output of the
PHC-12G
to the input of a
headend launch amplifier or distribution system.
The
PHC-12G
and
PHC-
passive headend combiners, consists of two
rows of directional couplers combined by a hybrid splitter. The directional
coupler combining provides high isolation (40 dB) between the inputs.
Normally, the odd channels are combined on one row while even chan-
nels are combined on the other row of directional couplers for maximum
isolation. The output of the
PHC-12G
may be connected to the input of
the
CA-30/1000
,
CA-30RK1000
. The output of the amplifier is connected
to the main distribution line.
Signal Combining Methods
PICO MACOM
recommends connecting the headend components in
the following manner: Each of the modulators, signal processors or strip
amplifiers output are connected to a combining network. Either a
PHC-12G
or a
PHC-24G
headend combiner may be used to accomplish
this purpose.
The
PHC-12G
or
PHC-24G
passive headend combiner consists of two
rows of directional couplers combined by a hybrid splitter. Normally, the
odd channels are combined on one row while even channels are
combined on the other row of directional couplers for maximum isolation.
The output of the combiners may be connected to the input of a launch
amplifier such as a
CA-30RK550
or
CA-30RK1000
. The output of the
amplifier is connected to the main distribution line.
The
CHC-16U/550
and
CHC-16U/860
sixteen channel active combin-
ers provides both signal combining and post amplification of the head-
end signals. Up to 16 channels may be combined using the
CHC-16U
.
The combiner gain is 15 dB per channel.
A 24 channel system hook-up is shown. (The same combining result
may be accomplished by using a single
PHC-24G
). The two
PHC-12G
outputs are combined via a two-way splitter, which is connected to a
CA-30RK1000
launch amplifier. The input levels to the combiner,
whether from a modulator, signal processor or a strip amplifier, must
be at the same amplitude.
