DRAKE 300VMFPLUS Gebrauchsanweisung - Seite 6

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6

Installation

CONNECTIONS AND CONTROLS
All connections to and from the 300VMF+ are made through
the rear panel. Figure 4 shows a typical two channel
installation using a typical satellite receiver as a signal
source.
Additional channels can be added by using
additional 300VMF+ modulators and either multi-port
combiners or combinations of two-port combiners.
INSTALLATION NOTES
Level adjustment provides optimum performance in
multichannel 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
300VMF+
VIDEO
AUDIO
INPUT
INPUT
300VMF+
VIDEO
AUDIO
INPUT
INPUT
VIDEO
OUT
AUDIO
OUT
R. L. DRAKE COMPANY
FRANKLIN, OH
R. L. DRAKE COMPANY
FRANKLIN, OH
TYPICAL MULTIPLE MODULATOR INSTALLATION
The 'RF Output Level' and 'A/V Ratio' controls are used
respectively to make these adjustments. If an output level of
less than +43 dBmV is required, add an attenuator of the
appropriate value to the modulator output.
Example: For an output level of +35 dBmV, add a 12 dB
attenuator pad to the modulator output and set the output
level.
RACK MOUNTING
Adequate ventilation is very important in multichannel
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
R.F.
OUTPUT
AUDIO
R.F.
OUTPUT
2-WAY SPLITTER/
COMBINER
Figure 4
TYPICAL
SATELLITE RECEIVER
REAR PANEL
VIDEO
OUT
AUDIO
OUT
AUDIO
VIDEO
120V AC
60Hz 610W
MADE IN TAIWAN
600W MAX
VIDEO
120V AC
60Hz 610W
MADE IN TAIWAN
600W MAX
OUT
OUT
RFI
dB
-130
MHz
5-1000
SPLITTER
2-WAY
3611
IN
RF OUT