Instruction manual

20K
20K
20K
20K
UNBALANCED
16 TO 4dBu
+
-
-
BALANCED
BALANCED
UNBALANCED
-
-
1 GND
-
-
2 HIGH
-
-
3 LOW
10 TO 10dBu
+
-
-
16 TO 4dBu
+
-
-
10 TO 10dBu
+
-
-
G R O U N D
L I F T
MADE IN U.S.A.
BY
R
D C I N P U T
ON OFF
12 VDC 250 mA
+
-
-
P O W E R
OFF C + L
L
L E F T A U D I O
I N P U T
ON OFF
R I G H T A U D I O
I N P U T
(MONO)
R F O U T P U T
L I M I T I N G /
C O M P R E S S I O N
4 Installation
SETUP and OPERATION
Rack Mounting
Adequate ventilation is very important in multichannel
installations. Units should be spaced apart by at least
one panel height wherever possible. Some air
movement is advisable in enclosed rack cabinets.
Excessive heat will shorten component life and
modulator performance will be degraded without
proper cooling.
Installation Notes
Level adjustment provides optimum performance in
multichannel installations. The RF output level from the
FMC 1000 is +50 dBmV nominal. The level can be
reduced to a value approximately 10 dB below the
nominal level by adjustment of the potentiometer that is
tunable through the rear panel access hole. The
access hole is located adjacent to the RF OUTPUT
connector. Use a small straight-slot type screwdriver to
adjust the potentiometer, if adjustment is necessary.
Counterclockwise rotation of the potentiometer
decreases the RF output level. If an output level of less
than +40 dBmV is required, add an attenuator of the
appropriate value to the modulator output.
Example: For an output level of +35 dBmV, add a 10 dB
attenuator pad to the modulator output and adjust the
level.
1. Connect the RF Output coaxial cable to the RF
OUTPUT connector.
2. Make audio connections
The FMC 1000 will accept line level audio inputs. The
best sources for a signal from a sound system are as
follows:
A. TAPE OUT or LINE OUT
B. BOOSTER or BRIDGING
C. Speaker Terminal
Use XLR connectors to connect balanced audio
signals to the FMC 1000 AUDIO INPUTs. Use RCA
phono connectors to connect unbalanced audio
signals to the FMC 1000 AUDIO INPUTs. The following
diagrams illustrate balanced and unbalanced audio
wiring details:
Balanced
Line
Unbalanced
Line
Male XLR Connector To
FMC 1000 Input
RCA Phono Connector
To FMC 1000 Input
Shield Grounded As Required
12
3
OR
To Combiner/Cable Distribution Access hole for RF output level
potentiometer
-
+