Drake VM2860A User Manual

VM2860/VM2862

Commercial Video Modulator

(For use in NTSC systems)

Instruction Manual

VM SERIES VIDEO MODULATOR

® is a registered trademark of the R.L. Drake Holdings LLC

Printed in China.

Rev: 20150206

1002470A/1002471A

2 Cautions Statements

WARNING: TO PREVENT FIRE OR

ELECTRICAL SHOCK, DO NOT

EXPOSE TO RAIN OR MOISTURE

with care. Quick stops, excessive force and uneven surfaces may cause the product and cart combination to overturn.

The lightning flash with arrow head symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS PRODUCT TO

RAIN OR MOISTURE.

A product and cart combination should be moved

DO NOT OPEN THE CABINET, REF

ER SERVICING TO QUALIFIED PERSONNEL ONLY.

CAUTION: TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION

CORD RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.

ATTENTION: 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.

Important Safety Instructions:

1. Read Instructions: All the safety and operating instructions should be read before the product is operated.

2. Retain Instructions: The safety and operating instructions should be retained for future reference.

3. Heed Warnings: All warnings on the product and in the operating instructions should be adhered to.

4. Follow Instructions: All operating and use instructions should be followed.

5. Cleaning: Unplug this product from the wall outlet before cleaning. Do not use liquid cleaner

6. Attachments: Do not use attachments that are not recommended by the product manufacturer as they may cause hazards.

7. Water and Moisture: Do not use this product near water—for example, near a bathtub, wash bowl, kitchen sink or laundry tub; in a wet basement;

or near a swimming pool; and the like.

8. Accessories: Do not place this product on an unstable cart, stand, tripod, bracket, or table. The product may fall, causing serious injury to a child

or adult, and serious damage to the product. Use only with a cart, stand, tripod, bracket, or table recommended by the manufact the product. Any mountin manufacturer.

9. A product and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the product and cart

combination to overturn.

10. Ventilation: Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the product and to protect it from

overheating, and these openings must not be blocked or covered. The openings should never be blocked by placing the product on a be or similar surface. This product should not be placed in a built-in installation such as bookcase or rack unless proper ventilation is provided or the manufacturer's instructions have been adhered to.

11. Power Sources: This product should be operated only from the type of power source indicated on the marking label. If you are not sure of the type

of power supplied to your home, consult your product dealer or local power company. For products intended to operate from battery power, or other sources, refer to the operatin

12. Grounding or Polarization: This product may be equipped with a polarized alternating-current line plug (a plug having one blade wider than the

other). This plug will fit into the power outlet only one way. This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug should still fail to fit, contact your electrician to replace your obsolete outlet. Do not defeat the saf plug. Alternate Warnings – If this product is equipped with a three-wire grounding- type plug, a plug having a third (grounding) pin, the plug will only fit into a grounding-type power outlet. This is a safety feature. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding-type plug.

g of the product should follow the manufacturer's instructions, and should use a mounting accessory recommended by the

g instructions.

s or aerosol cleansers. Use a damp cloth for cleaning.

d, sofa, rug,

ety purpose of the polarized

Cautions Statements continued

13.

Outdoor Antenna Grounding: If an outside antenna or cable system is connected to the product, be sure the antenna or cable system is

grounded so as to provide some protection against voltage surges and built-up static charges. Article 810 of the National Electrical Code, ANSI/NFPA 70, provides information with regard to proper grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna discharge unit, size of grounding conductors, location of antenna-discharge unit, connection to grounding electrodes, and requirements for the grounding electrode.

14. Power-Cord Protection: Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against

them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the product.

15. Lightning: For added protection for this product during a lightning storm, or when it is left unattended and unused for long periods of time, unplug it

from the wall outlet and disconnect the antenna or cable system. This will prevent damage to the product due to lightning and power-line surges.

16. Power Lines: An outside antenna system should not be located in the vicinity of overhead power lines, other electric light or power circuits, where it

can fall into such power lines or circuits. When installing an outside antenna system, extreme care should be taken to keep from touching such power lines or circuits as contact with them may be fatal.

17. Overloading: Do not overload wall outlets, extension cords, or integral convenience receptacles as this can result in a risk of fire or electric shock.

18. Object and Liquid Entry: Never push objects of any kind into this product through openings as they may touch dangerous voltage points or short-out

parts that could result in a fire or electric shock. Never spill liquid of any kind on the product.

19. Servicing: 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 personne

20. Damage Requiring Service: Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions:

a) When the power-supply cord or plug is damaged, b) If liquid has been spilled, or objects have fallen into the product, c) If the product has been exposed to rain or water, d) If the product does not operate normally by following the operating instructions.

Adjust only those controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation, e. If the product has been dropped or damaged in any way, and f. When the product exhibits a distinct change in performance—this indicates a need for service.

21. Replacement Parts: When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer

or have the same characteristics as the original part. Unauthorized substitutes may result in fire, electric shock or other hazards.

22. Safety Check: Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the

product is in proper operating condition.

23. Wall or Ceiling Mounting: The product should be mounted to a wall or ceiling only as recommended by the manufacturer.

24. Heat: The product should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including amplifiers) that

produce heat.

4 T

able of Contents / Description / Specifications

TABLE OF CONTENTS

2 Caution Statements 2 Important Safety Instructions 4 Table of Contents / Description / Specifications 5 Front/Rear Panel Controls and Indicators 6 Operation

7 Adjustments 8

Channel Assignments

Service / If You Need To Call For Help

Warranty

VM SERIES VIDEO MODULATOR

DESCRIPTION

The R.L Drake VM2860 and VM2862 Video Modulators are high quality, vestigial sideband units with synthesized visual and aural carriers. They are designed to accept NTSC video and audio baseband signals from a satellite receiver or similar equipment. Front panel video and audio level controls with accompanying modulation indicators permit easy setup of the proper modulation levels. The A/V ratio and RF output level controls are also provided on the front panel. A rear panel EAS alternate IF input is also provided. The VM2860 model is for applications with mono audio and the VM2862 model provides BTSC stereo encoded audio.

Synthesized operation provides complete frequency agility, allowing front panel selection of any standard CATV channel from 2 to 135 (54 to 862 MHz band). FCC required offsets for aeronautical channels are automatically provided for each channel that requires an offset. For special applications, IRC or HRC CATV frequencies or off-air broadcast frequencies can be selected from the front panel.

A high quality IF SAW filter with FCC predistortion eliminates adjacent channel interference and provides optimum delay characteristics.

SPECIFICATIONS - VM2860 / VM2862

VIDEO INPUT

Connector: “F” Female Impedance: 75 ohms

Video Input Level: 0.7 volt Peak-to-Peak Signal-to-Noise Ratio: 58 dB Differential Gain: 2.0% Differental Phase: 1.0 degree Over-modulation Indicator: 87 to 92%

Channel Modes: CATV (STD,IRC,HRC) UHF, VHF Power Level Range: +50 to +60 dBmV Video Flatness: fv-0.5 to fv+4.2 MHz : 1.5 dB p/v Carrier-to-Noise: -63 dB Broadband Noise: -77 dBc Spurious Outputs: -63 dBc Aural/Visual Carrier Ratio: -15 ± 5 dB

Return Loss: 18 dB

L/C Delay: Per FCC Requirements

RF OUTPUT

Connector: “F” Female

Impedance: 75 ohms

Return Loss: 12 dB

GENERAL

AC Power:

Temperature Range:

Fuse: Fuse: 0.4A Type T 250 V

Size: 19.0 x 14.25 x 1.75 in

Weight:

117 VAC ± 10%, 60 Hz,

29 Watts max

32° to 122° F

7 lbs.

A manual or auto-switching alternate IF input, labeled EAS input, is provided for connection of an Emergency Alert System 44 MHz IF signal. When the EAS IF signal appears at the EAS input, the main video and audio modulated IF is replaced by the EAS input signal.

The EAS/Alternate IF feature allows a choice between manual and automatic selection of the EAS/ALT IF input signal. This is done through a 3 position terminal strip on the rear of the unit. In the manual mode the EAS/ALT IF feature is activated by a contact closure switch, which completes a ground connection. In the automatic mode, two positions on the terminal strip are jumpered together enabling an automatic detection circuit in the unit. When an EAS/ALT IF signal is routed to the EAS/ALT port the unit automatically switches to that alternate signal.

MONO AUDIO (VM2860)

Input Impedance: Greater than 10k ohms, unbalanced.

Frequency Range: 50 Hz to 15 kHz Frequency Response: ± 0.5 dB

Total Harmonic Distortion: 1% @ 25 kHz deviation

Signal-to-Noise Ratio: 59 dB Over-modulation Threshold: 25 ± 2 kHz peak deviation

STEREO AUDIO

Input Impedance: Greater than 10k ohms unblanced Input sensitivity: 0.7 volt Peak-to-Peak

Frequency Response: ± 0.75 dB Separation: 20 dB

Harmonic Distortion: Less than 1%

Input/Output Connector: “F” Female

Composite IF Output:

Input/Output Impedance: 75 ohms Input/Output Return Loss: 16/15 dB

Connector: RCA

Input Level: 0.5 to 4.0 volt Peak-to-Peak

(VM2862 only)

Connector: RCA

Aural Frequency: 41.25 MHz

Visual Frequency: 45.75 MHz

Aural: +20 dBmV

Visual: +35 dBmV

EAS/Alternative IF: Connector: “F” Female Input Level: +35 dBmV @ 45.75 MHz

Switch Isolation: Greater than 60 dB

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