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I N S TA L L A T I O N
Signal Combining Methods
V
+52dBmv
PFAM550mt
M600
A
RF
+10dBmv
+52dBmv
SP600
IN
RF
+14dBmv
+52dBmv
*BS
IN
+10dBmv
V
+52dBmv
PFAM550mt
A
+10dBmv
+52dBmv
RF
SP600
IN
+52dBmv
+14dBmv
RF
*BS
+10dBmv
IN
V
+50dBmv
PFAM550mt
A
RF
+50dBmv
+10dBmv
SP600
IN
+50dBmv
RF
+14dBmv
*BS
IN
+10dBmv
6
PICO MACOM INC.
12500 Foothill Blvd. • Lakeview Terrace, CA 91342 • (818) 897-0028 • (800) 421-6511 • FAX (818)834-7197
All manuals and user guides at all-guides.com
Ch. 2
PHC-12U
-16dB
+36dBmv
Ch. 3
6dB PAD
CA-30RK550
Ch. 4
Ch. 2
CHC-16U
+10dB
to
+15dB
Ch. 3
Ch. 4
PAD
Ch. 2
+43dBmv
Ch. 4
EVEN CHANNELS
Ch. 3
+43dBmv
ODD CHANNELS
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-30RK550** post amplifier.
*BS - Denotes low, medium and high band 2 volt strip amps.
T
he output levels of the modulator should be
the same as the output of the off-air strip ampli-
fiers. The PFAM550mt modulators are usually
combined with either the SP600, LBS/HBS
series strip amplifiers. Three methods are sug-
gested to combine strip amplifier,
modulator and processor outputs.
+60dBmv
T
he PHC-12U 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.
+58dBmv
T
he CHC-16U** provides both signal com-
bining and post amplification of the headend
signals. Up to 16 channels may be combined
using the CHC-16U. The combiner gain is 15
dB per channel.
+36dBmv
CA-30RK550
6dB PAD
T
he final method of combining signals uses
three hybrid splitters per headend rack. The odd
channels are combined in one splitter, the even-
+60dBmv
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