DRAKE VM2551 Instruction Manual download pdf (Page 5)

Rear Panel Connections 5

RF OUTPUT

MADE IN TAIWAN

IF IN IF OUT VIDEO INPUT AUDIO INPUT 4.5 MHz INPUT

120V AC

60 Hz 618W600W MAX

R1 - RF OUTPUT

This is the modulator output.

R2 - IF IN Connector

This is the composite IF input to the up converter circuits.

The composite IF has both the aural and visual IF

combined. This connection is normally cabled directly

from the “COMPOSITE IF OUT” connector (See R3). This

external IF loop allows the use of accessories such as

scramblers or alternate video sources.

R3 - IF OUT Connector

This is the composite IF output from the IF circuits. The

composite IF provides a vestigial sideband filtered visual

carrier at 45.75 MHz combined with a level controlled

(-15 dBc typical) aural carrier at 41.25 MHz. This connec-

tion is normally cabled directly to the “COMPOSITE IF IN”

connector (See R2). The video carrier output level is

+40 dBmV.

R4 - VIDEO INPUT Connector

This is the baseband video input to the IF circuits. This

input accepts baseband through 4.2 MHz video at levels

from 0.7 Vp-p to 1.5 Vp-p.

R5 - AUDIO INPUT Connector

This is an unbalanced audio input to the IF circuits. This

“RCA” (phono) connector input accepts 40 Hz through

15 kHz audio at a nominal level of 250 mV RMS

(approximately -10 dBu). Input impedance is 10K Ohms.

R6 - 4.5 MHz INPUT

To use this input, remove the top cover of the modulator

and move jumper J2 to the ON position. Input 4.5 MHz at

R6 at a level of +37 dBmV.

R7 - 600 W Convenience Outlet

This outlet is unfused and must be limited to a 5A or 600

W load at 120 VAC.

R8 - LINE CORD

Connect the 3 wire IEC line cord to this connector.

Connect to a nominal 115 VAC ±10%, 60 Hz source. Do

not defeat the safety purpose of the ground pin on the line

cord plug.

R9 - FUSE

To access the fuse, unplug line cord from the socket R8.

Pull out on the tab on the upper side of the fuse

holder assembly.

R1 R2 R3 R4 R5 R6 R7 R8

FIGURE 2

1 2 3 4 5 6 7 8 9 10

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DRAKE VM2551 Instruction Manual Page 5

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