DRAKE VM2050 Gebruiksaanwijzing - Pagina 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