DRAKE 300VMFPLUS Instruction Manual

TM

300VMF

+

Commercial Video Modulator

(For use in NTSC systems)

Instruction Manual

© Copyright 2005 R.L. Drake Company P/N: 3853616D-10-2005

is a trademark of the R.L. Drake Company

TM

2 Caution Statements

IMPORTANT SAFEGUARDS

This symbol is intended to alert the user to the presence of
non-insulated "dangerous voltage" within the product's enclosure,
that may be of sufficient magnitude to constitute a risk of electric
shock to persons.

This symbol is intended to alert the user to the presence of
important operating and maintenance (servicing) instructions in the
literature accompanying the appliance.

TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE

CAUTION

CAUTION

TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER (OR BACK)

WARNING:

"CAUTION" -

ATTENTION:

NO USER SERVICEABLE PARTS INSIDE.

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.

Do not attempt to service this product yourself as opening or
removing covers may expose you to dangerous voltage or
other hazards. Refer all servicing to qualified service
personnel.

POUR PREVENIR LES CHOCS ELECTRIQUES, NE PAS UTILISER CETTE
FICHE POLARISEE AVEC UN PROLONGATEUR, UNE PRISE DE
COURANT OU UNE AUTRE SORTIE DE COURANT, SAUF SI LES LAMES
PEUVENT ETRE INSEREES A FOND SANS EN LAISSER AUCUNE PARTIE
A DECOUVERT.

REFER SERVICING

TO QUALIFIED PERSONNEL.

Important Safety Instructions

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers)
that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one
wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the
third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.

9 a. Mise à la terre ou Polarisation—Cet appareil est équipé avec un cordon d'alimentation à trois fils. Il est a brancher

sur une prise ayant un connecteur a la terre. Assurez-vous que la connection a la terre ne manque pas.

10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When
a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13. Unplug the apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any
way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

Table of Contents/Description/Specifications 3

TABLE OF CONTENTS

2 Caution Statements
2 Important Safety Instructions
3 Table of Contents / General Description
3 Specifications
4 Front Panel Controls, Indicators, and

Connections

DESCRIPTION

5 Rear Panel Connections and Internal Jumper
6 Installation
7 Frequency Allocation Charts
8 Service / If You Need To Call For Help
9 Warranty

The DRACOM 300VMF+ Video Modulator is a vestigial
sideband heterodyne audio/video modulator that
provides a modulated visual and aural RF carrier output
on any single EIA standard channel from channel 2
through channel 78 plus channels 95 to 99. This range
covers 54 through 552 MHz. Consult factory for custom
channels. All aeronautical channels are offset positive
with a tolerance of ±5 kHz as required by FCC rules. The
300VMF+ is designed to accept video and audio

SPECIFICATIONS

RF

Frequency Range:

Channels Available:

FCC Frequency

Offsets:

Output Level:

Output Impedance:

Output Test:

A/V Ratio:

Frequency Stability,

Aural Intercarrier

Frequency:

Spurious Outputs:

In-Channel C/N:

Broadband Noise:

54 - 552 MHz.

Factory ordered for a single channel:

EIA CATV channels 2 to 78 and 95 to 99.

All aeronautical channels offset positive
with a tolerance of ±5 kHz.
+55 dBmV, (typically adjustable from +43
to +55 dBmV).
75 OHMS, return loss of 14 dB, nominal.

-30 dB, ±3 dB (referenced to
RF OUTPUT level).
Audio Carrier -20 to -12 dB referenced to
video carrier, adjustable.

Within ±10 kHz of assigned channel

Visual:

frequency; ±5 kHz on FCC
offset channels.

4.5 MHz, ±5 kHz.

-60 dBc minimum, measured at -15 dB A/V
ratio and with modulator output level of
+55 dBmV.
Better than 60 dB.

-95 dBc @ ±30 MHz or
greater spacings. (Specified levels are
referenced to the video carrier and
measured in a 4 MHz bandwidth).

baseband signals from a satellite receiver, TV camera,
video tape recorder, TV demodulator or similar
equipment. The heterodyne conversion system, in
conjunction with the use of a SAW filter, insures optimum
vestigial selectivity for adjacent channel headends.

The modulator accepts standard (sync negative) polarity
video at a 0.7 -1.5 Vpp level. All level controls are
located on the front panel for ease of operation.

VIDEO

Input level for 87.5%

Modulation:

Input Impedance:

Frequency Response:

Video S/N:
L/C Delay:

Differential Gain:

Differential Phase:

AUDIO

Input Level for

25 kHz Peak Deviation:

Input Impedance:

Pre-emphasis:

Frequency Response:

4.5 MHz Intercarrier Stability:
Total Harmonic Distortion:

Hum and Noise:

GENERAL

Modulator Power

Requirement:

Auxiliary AC Outlet:

Total AC Power Input:

Operating Temperature

Range:

Weight:

Connectors:

1 Vp-p ±3 dB, manual gain adjust with
front panel control.
75 Ohms, return loss of 18 dB
minimum.
Flat ±2 dB from 30 Hz to 4.2 MHz.
60 dB, luminance weighted.
Within 50 nSec of 0 nSec L/C delay
(complies with FCC rules, 76.605).
Less than ±5% (10 to 90% APL).
Less than ±5 degrees (10 to 90% APL).

175 mV rms minimum. Manual gain
adjustment with front panel control.
10K Ohms, unbalanced.
75 µSec.(flat by moving internal jumper)
40 Hz to 15 kHz, ±1.5 dB, referenced to
75 µSec pre-emphasis curve.
Within ±5 kHz, 00 C to +500 C.

1.5% maximum.

-60 dB minimum, referenced
to 25 kHz peak deviation.

115 VAC ±10%, 60Hz, 10 Watts.
Nominal 120 VAC, 600 Watts, maximum.
Nominal 120 VAC 60 Hz,
610 Watts, maximum.

00 C to +500 C, ambient.
19" W x 1.75" H x 4.0" D.

Size:

3.6 lbs.
Video input, Audio input, RF output, and
Monitor output are all type F.