DRAKE VMR860AS Інструкція з експлуатації - Сторінка 2

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REAR PANEL CONNECTIONS

RF OUT

R1 - RF OUTPUT Connector

This is the modulator output.

R2 and R3 - AUDIO INPUT Connectors

These "RCA" (phono) connector inputs accept

baseband audio from 250 mVrms to 3 Vrms

levels. NOTE: In the AG models, an internally

selected jumper can defeat the audio pre-

emphasis for use with a stereo encoder. See

Diagram on page 4.

For AG mono models, the inputs from the left

and right jacks are internally summed. Input

can be from a stereo source to both inputs or

from a mono source to just one of the inputs.

INSTALLATION NOTES

Level adjustment provides optimum

performance in multichannel installations.

The modulator outputs should be checked

periodically with a spectrum analyzer or signal

strength meter 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 'RF' and 'A/V (Ratio)' controls are used

respectively to make these adjustments.

AUDIO IN

VIDEO IN

POWER

LEFT

RIGHT

Figure 2

For the AS stereo models, R2 and R3 are the

left and right stereo channel inputs. A mono

source connected to an AS stereo unit should

be input to both connectors using a "Y" cable.

R4 - VIDEO INPUT Connector

This is the baseband video input to the IF

circuits. This input accepts baseband input

levels from 0.6 Vp-p to 1.5 Vp-p.

R5 - POWER / DC INPUT Connector

This connector accepts the appropriate mating

DC power cable from the supplied AC adapter.

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

mandatory in enclosed rack cabinets.

Excessive heat will shorten component life and

modulator performance will be degraded without

proper ventilation.

SETTING THE INTERNAL JUMPERS

ACCESSING THE JUMPERS

- First, make certain the unit is disconnected

from its power source.

- Next, remove the four #4 screws from each

side of the top cover. Save the screws for later

reassembly.

- Carefully remove the top cover by lifting it

upward from the chassis. The jumpers are now

accessible for setting as desired.

INTERNAL JUMPER FUNCTIONS

Front of VMM860AG With Cover Removed

JUMPER FUNCTIONS

Refer to the INTERNAL JUMPER FUNCTIONS

diagram for a brief explanation of the two

jumpers used in the jumper settings.

Refer to the INTERNAL JUMPER SETTINGS

Diagram for proper jumper placement of the

desired mode.

Audio Pre-emphasis jumper shown

in the ON position.

Shown in standard configuration

(no jumper). Add jumper for IRC or

HRC.