PICO MACOM INC.
12500 Foothill Blvd. • Lakeview Terrace, CA 91342 • (818) 897-0028 • (800) 421-6511 • FAX (818) 834-7197
Signal Combining Methods
I N S T A L L A T I O N
6
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-30RK550 post amplifier.
*BS - Denotes low, medium, high and superband 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 PFAD 900cs demodulator can be
combined with either the M600 modulator or
the PFAM 550 agile modulator. These are then
combined with the SP600 channel
processor or the LBS/HBS series
strip amplifiers. Three methods
are suggested to combine strip am-
plifier, modulator and processor
outputs.
T
he PHC-12U twelve channel passive com-
biner consists of two rows of directional cou-
plers combined by a hybrid splitter. The direc-
tional coupler combining provides high isola-
tion (40 dB) between the inputs. Normally, the
odd channels are combined on one row while
even channels are combined on the other row of
directional couplers. The combiner loss is 16
dB per channel.
Ch. 2
Ch. 3
Ch. 4
+36dBmV
+60dBmV
SP600
*BS
V
A
+52dBmV
+52dBmV
+52dBmV
+10dBmv
+14dBmv
+10dBmv
SP600
*BS
V
A
+52dBmV
+52dBmV
+52dBmV
+10dBmV
+14dBmV
+10dBmV
SP600
*BS
V
A
+50dBmV
+50dBmV
+50dBmV
+10dBmV
+14dBmV
+10dBmV
Ch. 2
Ch. 3
Ch. 4
PAD
+58dBmV
EVEN CHANNELS
Ch. 2
Ch. 3
Ch. 4
ODD CHANNELS
+43dBmV
+43dBmV
+36dBmV
+60dBmv
6dB PAD
6dB PAD
RF
IN
RF
IN
RF
IN
RF
IN
RF
IN
RF
IN
PHC-12U
-16dB
CHC-16U
+10dB
to
+15dB
CA-30RK550
CA-30RK550
ATTENUATOR PAD
ATTENUATOR PAD
ATTENUATOR PAD
PFAD 900cs
M600
or
PFAM 550
RF
IN
RF
IN
RF
IN
PFAD 900cs
M600
or
PFAM 550
PFAD 900cs
M600
or
PFAM 550
T
he CHC-16U sixteen channel active com-
biner provides both signal combining 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.