PICO MACOM INC.
12500 Foothill Blvd. • Lakeview Terrace, CA 91342 • (818) 897-0028 • (800) 421-6511 • FAX (818) 834-7197
P A N E L S
4
Front & Rear Panels
1.
Power On Indicator:
The LED indicates unit is operating.
2.
Test Point:
The -30 dB RF output test point is used to set the
RF output level and monitor channel
performance.
3.
RF Output Level:
This rugged PC Board mounted control sets the
RF output level.
4.
Audio Modulation:
The heavy duty PC mounted control is used to
set the audio modulation level.
5.
Aural Level:
This potentiometer controls the level of the
audio RF carrier.
6.
Video Modulation Adjust:
The PC Board mounted control is used to set
the video modulation level.
7.
Video In:
The PC Board mounted "F" connector accepts
the negative sync video information from
a satellite receiver or VCR.
8.
Audio In:
The audio from the satellite receiver or
VCR is connected to this PC Board mounted
F connector.
9.
RF Out:
The modulated output signal is available
on this PC Board mounted "F" connector.
10.
Convenience Outlet:
Allows looping of power between units.
11.
Power Cord:
The three prong type power plug connects to
a 120 VAC, 60 Hz electrical output or if
220VAC, 60 Hz, a two prong flat blade type
is used.
The PCM55 modulator is a crystal controlled modu-
lator. The modulator's operating frequency is deter-
mined by the frequency of a high accuracy tempera-
ture compensated crystal. The video is applied
through a front panel controlled potentiometer to an
integrated circuit. The amount of video applied to
the IC determines the depth of modulation. A surge
protection circuit is connected to the video input to
protect the IC from high level inputs. The audio is
coupled through a front panel controlled potentio-
meter to a high impedance input transistor. This
buffer circuit isolates the IC from the input, and
eliminates the need for special impedance matching.
Additionally, input surge protection is provided.
PCM55
AUDIO VIDEO MODULATOR
TEST
POINT
R.F.
OUTPUT
AUDIO
MODULATION
AURAL
LEVEL
ADJUST
LEVEL
ADJUST
VIDEO
MODULATION
-30 dB
1
2
3
4
5
6
CH-
RF OUT
120VAC
60Hz 10W
AUDIO IN
VIDEO IN
600 VA MAX
+
+
+
+
+
+
+
9
8
7
10
11
