FUSE
1/8A, 250V
SLO-BLO
115V 60 Hz
10 WATTS
IN OUT
600 WATTS MAX
R F O U T
CAUTION:
- RISK
OF FIRE -REPLACE
FUSE AS MARKED
AFTER DISCONNECTING
UNIT FROM AC LINE
ATTENTION:
- RISQUE D'INCENDIE -
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU
SECTEUR
COMPOSITE
I F
VIDEO
INPUT
AUDIO
INPUT
120V, 5A
MADE IN U. S. A. BY ®
FUSE
1/8A, 250V
SLO-BLO
115V 60 Hz
10 WATTS
IN OUT
600 WATTS MAX
R F O U T
CAUTION:
- RISK
OF FIRE -REPLACE
FUSE AS MARKED
AFTER DISCONNECTING
UNIT FROM AC LINE
ATTENTION:
- RISQUE D'INCENDIE -
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU
SECTEUR
COMPOSITE
I F
VIDEO
INPUT
AUDIO
INPUT
120V, 5A
MADE IN U. S. A. BY ®
8 Installation
Figure 3
TYPICAL MULTIPLE MODULATOR INSTALLATION
CONNECTIONS AND CONTROLS
All connections to and from the VM1550 are made through
the rear panel.
Figure 3 shows a typical two channel
installation using a typical satellite receiver as a signal
source. Additional channels can be added by using
additional VM1550 modulators and either multi-port
combiners or combinations of two-port combiners.
INSTALLATION NOTES
Level adjustment provides optimum performance in
multi-channel installations. The modulator outputs should
be checked periodically with a spectrum analyzer to maintain
a ±1 dB variation of adjacent channel carriers. Aural/Visual
(A/V) ratios should be held to -15 dB or less.
The output 'RF Level' and 'A/V Ratio' controls are used
respectively to make these adjustments. If an output level of
less than +35 dBmV is required, add an attenuator of the
appropriate value to the modulator output.
Example: For an output level of +30 dBmV, add a 10 dB
attenuator pad to the modulator output.
RACK MOUNTING
Adequate ventilation is very important in multi-channel
installations. Units should be spaced apart by at least one
panel height wherever possible, and some air movement is
advisable in enclosed rack cabinets. Excessive heat will
shorten component life and modulator performance will be
degraded without proper cooling.
H
V
VIDEO
OUT
AUDIO
OUT
H
V
VIDEO
OUT
AUDIO
OUT
TYPICAL
SATELLITE RECEIVER
REAR PANEL
TYPICAL
SATELLITE RECEIVER
REAR PANEL
AUDIO
VIDEO
AUDIO
VIDEO
RF OUT
COMBINER
Summary of Contents for VM1550
Page 11: ...Warranty Notes 11...
