DRAKE VM1550, Instruction Manual

FUSE

1/8A, 250V

SLO-BLO

115V 60 Hz

10 WATTS

IN                                                                                           OUT

600 WATTS MAX

R F   O U T

CAUTION:

- RISK 

OF FIRE -REPLACE 
FUSE AS MARKED 
AFTER DISCONNECTING 
UNIT FROM AC LINE

ATTENTION: 

- RISQUE D'INCENDIE -
REMPLACEZ FUSIBLE DU 
TYPE INDIQUE APRES 
DEBRANCHER DU 
SECTEUR

COMPOSITE

I F

VIDEO
INPUT

AUDIO

INPUT

120V, 5A

MADE IN U. S. A. BY               ®

Rear Panel Connections     7

      R1                                                         R2                                R3                                     R4        R5              R6             R7         R8

R5 - AUDIO INPUT Connector
This is an unbalanced audio input to the IF circuits.  This
“RCA” (phono) connector input accepts baseband through
15 kHz audio at a nominal level of 250 mV RMS
(approximately 0 dBm).  NOTE: An internally selected test
point jumper defeats the audio pre-emphasis for
stereo capability.

R6 - FUSE
Always replace this fuse with one of the same type and
rating: 1/8 Amp, 250 V SLO-BLO® , 3AG type.

R7 - AC OUTLET Receptacle
This is a power receptacle for other other equipment and
is rated at 600 WATTS maximum; 120 V, 5 Amp.  This
receptacle is unfused and unswitched.

R8 - LINE CORD
This is a three-wire power cable.  When the cable is
connected to a properly wired AC power line outlet, this
cable grounds the instrument cabinet.  Connect to a
nominal 115 VAC ±10%, 60 Hz source.  Do not defeat the
safety purpose of the attached line cord plug.

R1 - RF OUT
This is the modulator output.

R2 - COMPOSITE IF INPUT Connector
This is the composite IF input to the heterodyne converter.
The composite IF has both the aural and visual IF
combined.  This connection is normally cabled directly to
the “COMPOSITE IF OUT” connector (See Item `R3').
This external IF loop allows the use of accessories such
as scramblers or alternate video sources.  Note that
accessory equipment must also have the visual carrier at
45.75 MHz and the aural carrier at 41.25 MHz.  Both input
levels must be at their nominally specified levels.

R3 - COMPOSITE IF OUTPUT 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
connection is normally cabled directly to the
“COMPOSITE IF IN” connector (See Item `R2').

R4 - VIDEO INPUT Connector
This is the baseband video input to the IF circuits.  This
input accepts baseband thru 4.2 MHz video at levels from
0.7 Vp-p to 1.5 Vp-p.