DRAKE VM2050 Instrukcja obsługi - Strona 8
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Installation/Channel Assignments
CONNECTIONS AND CONTROLS - All connections to
and from the VM2050 are made through the rear panel.
Figure 3 shows a typical two channel installation using a
camera and VCR as signal sources. Additional channels
can be added by using additional VM2050 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. The 'Output Level' and
'A/V Ratio' controls are used respectively to make these
adjustments. If an output level of less than +50 dBmV is
required, add an attenuator of the appropriate value to the
modulator output.
Example: For an output level of +45 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.
Table 1 - CHANNEL ASSIGNMENTS
Switch
Position
T07
T08
T09
T10
T11
T12
T13
T14
Visual
Carrier
MHz
7.00
13.00
19.00
25.00
31.00
37.00
43.00
49.00