Pico Macom PCM55, Инструкция по установке и эксплуатации

Страница: 7 / 12

PICO MACOM INC.
12500 Foothill Blvd. • Lakeview Terrace, CA 91342 • (818) 897-0028 • (800) 421-6511 • FAX (818) 834-7197
6
I N S T A L L A T I O N
Signal Combining Methods
Ch. 2
Ch. 3
Ch. 4
+36dBmV
+60dBmV
PCM55
SP600
V
A
+52dBmV
+52dBmV
+52dBmV
+10dBmV
+14dBmV
+10dBmV
SP600
LBS/72L
V
A
+52dBmV
+52dBmV
+52dBmV
+10dBmV
+14dBmV
+10dBmV
PCM55
SP600
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
PCM55
PHC-12U
-16dB
CHC-16U
+10dB
to
+15dB
CA-30RK550
CA-30RK550
ATTENUATOR PAD
ATTENUATOR PAD
ATTENUATOR PAD
LBS/72L
LBS/72L
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.
Note: (*) denotes either LBS, MBS, HBS or FMS strip amplifiers.
T
he output levels of the modulator should be
the same as the output of the off-air strip ampli-
fiers. The PCM55 modulators are usually com-
bined with either the SP600, LBS/HBS or 72
series strip amplifiers. Three methods are sug-
gested to combine strip amplifier,
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.
T
he CHC-16U sixteen channel active com-
biner provides both signal combining and post
amplification of the headend signals. The unit
is basically a passive combiner and a CA30 all
in one package. Up to 16 signals may be
combined using the CHC-16U. 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-
Method 1
Method 2
Method 3