DRAKE VM1550 Manual de instruções - Página 8

Procurar online ou descarregar pdf Manual de instruções para Modulador DRAKE VM1550. DRAKE VM1550 14 páginas. Commercial video modulator (for use in ntsc systems)

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8

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.
TYPICAL
SATELLITE RECEIVER
REAR PANEL
H
V
MADE IN U. S. A. BY
®
R F O U T
MADE IN U. S. A. BY
®
R F O U T
COMBINER
RF OUT
VIDEO
OUT
AUDIO
OUT
VIDEO
AUDIO
COMPOSITE
I F
IN
COMPOSITE
I F
IN
TYPICAL MULTIPLE MODULATOR INSTALLATION
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
CAUTION:
- RISK
OF FIRE -REPLACE
FUSE AS MARKED
VIDEO
AFTER DISCONNECTING
OUT
INPUT
UNIT FROM AC LINE
ATTENTION:
- RISQUE D'INCENDIE -
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU
SECTEUR
CAUTION:
- RISK
OF FIRE -REPLACE
FUSE AS MARKED
VIDEO
AFTER DISCONNECTING
OUT
INPUT
UNIT FROM AC LINE
ATTENTION:
- RISQUE D'INCENDIE -
REMPLACEZ FUSIBLE DU
TYPE INDIQUE APRES
DEBRANCHER DU
SECTEUR
Figure 3
TYPICAL
SATELLITE RECEIVER
REAR PANEL
VIDEO
OUT
AUDIO
OUT
AUDIO
FUSE
600 WATTS MAX
1/8A, 250V
115V 60 Hz
SLO-BLO
AUDIO
INPUT
120V, 5A
FUSE
600 WATTS MAX
1/8A, 250V
115V 60 Hz
SLO-BLO
AUDIO
INPUT
120V, 5A
10 WATTS
10 WATTS