CEF/750
7
Rev. 06/03
Ph: 800-421-6511
www.picomacom.com
Installation Procedure
Installation
It is recommended that assistance be available to safely install equip-
ment in equipment racks. Chassis must be fastened securely in equip-
ment rack before populating with modules.
1. Install
CEF/750
in equipment rack (equipment rack sold separately)
by supporting the bottom and rear of the unit at the desired elevation in
rack.
2. Line up the side holes of
CEF/750
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 a cable from the antenna or CATV signal source (ensure
that all line voltages have been removed) to the input connector of the
CEF/750
.
6. Connect a cable from the output connector of the
CEF/750
to the
input of a headend channel combiner (
PHC-12G
,
PHC-24G
, or
CHC-
16U
) or a signal splitter (
TSB-21G
) used as a combiner (backwards).
7. Connect the channel to be inserted into the headend channel com-
biner (
PHC-12G
,
PHC-24G
, or
CHC-16U
) or a signal splitter (
TSB-
21G
) used as a combiner (backwards).
8. Measure the signal level of the inserted channel and the adjacent
channels of the combined output. (IMPORTANT NOTE: Inserted chan-
nel signal amplitude level must be within 3dB of the adjacent channels
for proper operation.)
9. Match channel amplitude levels by inserting an amplifier (
CA-
30RK1000
) in the path with the lower level, and/or an attenuator in the
path with the higher level. (See diagram)
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 com-
bined 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.
