DRAKE HCP1550 Інструкція з експлуатації - Сторінка 7

Переглянути онлайн або завантажити pdf Інструкція з експлуатації для Комп'ютерне обладнання DRAKE HCP1550. DRAKE HCP1550 12 сторінок. Commercial heterodyne channel processor (for use in ntsc systems)

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CONNECTIONS AND CONTROLS – All

connections to and from the HCP1550 are made

through the rear panel. Figure 3 shows a typical two

channel processing installation involving the

converting of an off-air signal and a CATV signal.

Additional channels can be processed by using

additional channel processor units and either

multi-port combiners or combinations of two-port

combiners.

INSTALLATION NOTES – Level adjustment

provides optimum performance in multichannel

installations. The channel processor 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.

HCP1550

MADE IN THE U.S.A. BY

OUTPUT

SERIAL #

HCP1550

MADE IN THE U.S.A. BY

OUTPUT

SERIAL #

2-WAY SPLITTER/

OUT

RFI

-130

MHz

5-1000

SPLITTER

2-WAY

3611

RF OUT

TO SYSTEM

COMPOSITE IF

OUT

LOOP

COMPOSITE IF

OUT

LOOP

COMBINER

Figure 3 - Typical Multiple Channel Processor Installation.

Installation

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 unit performance will

be degraded without proper cooling.

FCC PAR.76.612 – Certain cable channel

frequencies assigned to aviation and navigation

communications require frequency offsets. The

OUTPUT CHANNEL switches set the output

frequency for a visual carrier frequency of 'xx.25' or

'xxx.25' MHz only. The exact output frequency,

however, is relative to the input signal frequency and

any additional offset (plus or minus) set by the

OFFSET switches. Refer to the 'Output Channel' list

in the Installation section of this manual to determine

the required offset for a particular output channel.

OFF-AIR

CAUTION:

OF FIRE - REPLACE

FUSE AS MARKED

INPUT

AFTER DISCONNECTING

UNIT FROM AC LINE.

ATTENTION:

- RISQUE D'INCENDIE -

REMPLACEZ FUSIBLE DU

TYPE INDIQUE APRES

DEBRANCHER DU SECTEUR.

CATV