PICO MACOM INC. 12500 Foothill Blvd. • Lakeview Terrace, CA 91342 • (818) 897-0028 • (800) 421-6511 • FAX (818) 834-7197
I N S T A L L A T I O N
S I G N A L C O M B I N I N G M E T H O D S
7
T
he output levels of the off-air strip amplifiers
should be the same as the output of the modula-
tors . The M600 modulators are usually com-
bined with either the SP600, LBS/HBS or 72
series strip amplifiers. Three methods are sug-
V
H
+10dBmv
+14dBmv
+10dBmv
LBS/72L
LBS/72L
LBS/72L
+52dBmv
CH 2
CH 3
CH 4
CH 2
CH 3
CH 4
PHC-12
CHC-16
+10dB
to
+15dB
V
H
+10dBmv
+14dBmv
+10dBmv
+10dBmv
+14dBmv
+10dBmv
PAD
+47dBmv
+47dBmv
+47dBmv
+36dBmv
CA-30RK
+58dBmv
+58dBmv
CH 2
CH 4
EVEN
ODD
CH 3
V
H
M600
SP600
M600
SP600
M600
SP600
-16dB
+52dBmv
+52dBmv
+52dBmv
+36dBmv
CA-30RK
+58dBmv
+43dBmv
+43dBmv
+50dBmv
+50dBmv
+50dBmv
gested to combine strip amplifier,
modulator and processor outputs.
T
he PHC-12 consists of two rows of direc-
tional couplers combined by a hybrid splitter.
The directional coupler combining provides
high isolation (40 dB) between the inputs. Nor-
mally the odd channels are combined on one
row while even channels are combined on the
other row of directional couplers. The com-
biner loss is 16 dB per channel.
T
he CHC-16 provides both signal combin-
ing and post amplification of the headend sig-
nals. The unit is basically a passive combiner
and a CA30 all in one package. Up to 16 signals
may be combined using the CHC-16. The
combiner gain is 15 dB per channel.
T
he final method of combining signals uses
three hybrid splitters per headend rack. The odd
channels are combined in one splitter, the even-
channels in another splitter and the two splitters are combined to a single
output with a third splitter. Each rack is then combined with a final splitter
prior to the CA-30 post amplifier.
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