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Summary of Contents for DRAKE VM1550
- Page 1 VM1550 Commercial Video Modulator (For use in NTSC systems) Instruction Manual ® is a registered trademark of the R.L. Drake Company © Copyright 2002 R.L. Drake Company P/N - 3857400K-3-2002 Printed in U.S.A.
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Page 2: Caution Statements
Caution Statements WARNING: TO PREVENT FIRE OR A product and cart combination should be moved ELECTRICAL SHOCK DO NOT with care. Quick stops, excessive force and EXPOSE TO RAIN OR MOISTURE uneven surfaces may cause the product and cart combination to overturn. The lightning flash with arrow head symbol, within CAUTION an equilateral triangle, is intended to alert the user... -
Page 3: Important Safety Instructions
Important Safety Instructions 1. Read Instructions—All the safety and operating instructions should be read 14. Outdoor Antenna Grounding—If an outside antenna or cable system is before the product is operated. connected to the product, be sure the antenna or cable system is grounded so 2. -
Page 4: Table Of Contents
A U D I O L E V E L OVER POWER MODULATION The R.L Drake VM1550 Video Modulator is a high quality The modulator accepts standard (sync negative) polarity vestigial sideband heterodyne audio/video modulator that video at a 0.7 -2.5 Vpp level. All level controls and... -
Page 5: Specifications
Specifications Video S/N: 60 dB minimum, Frequency Range: 54 - 348 MHz. luminance weighted. Channels Available: VHF 2-13, L/C Delay: ±35 nSec referenced to 0 nSec Lowband 1 (A8) L/C delay (complies with FCC Midband 14-22 (A-I) and rules, 76.605). 95-99 (A5-A1), Superband 23-36 (J-W), Differential Gain:... -
Page 6: Front Panel Controls And Indicators
Lights when the unit is connected to a source of AC The label indicates the fixed channel output for your power. particular model. The VM1550 is capable of fixed channel output within the following ranges: VHF, 2-13; Lowband 1 F2 - AUDIO LEVEL Control (A8): Midband, 14-22 (A-I) and 95-99 (A5-A1);... -
Page 7: Rear Panel Connections
Rear Panel Connections FUSE MADE IN U. S. A. BY ® CAUTION: - RISK 600 WATTS MAX 115V 60 Hz 1/8A, 250V COMPOSITE OF FIRE -REPLACE 10 WATTS SLO-BLO FUSE AS MARKED VIDEO AUDIO AFTER DISCONNECTING R F O U T INPUT INPUT UNIT FROM AC LINE... -
Page 8: Installation
CONNECTIONS AND CONTROLS The output 'RF Level' and 'A/V Ratio' controls are used All connections to and from the VM1550 are made through respectively to make these adjustments. If an output level of the rear panel. Figure 3 shows a typical two channel... - Page 9 Frequency Allocation Chart CABLE TV CHANNELS Channel Designation Standard EIA/NCTA Visual Carrier Alphanumeric Numeric Frequency Identification Equivalent (MHz) 55.25 61.25 67.25 77.25 83.25 91.25 97.25 103.25 A-2* 109.25 A-1* 115.25 121.25 127.25 133.25 139.25 145.25 151.25 157.25 163.25 169.25 175.25 181.25 187.25 193.25...
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Page 10: Internal Jumper Selection
LETHAL VOLTAGES IF THE EQUIPMENT IS POWERED FROM AN AC POWER SOURCE. REFER SERVICING TO A QUALIFIED TECHNICIAN ONLY. Audio - Pre-emphasis (factory setting) Audio - Flat TOP, FRONT VIEW OF UNIT FIGURE 4 VM1550 IF / POWER SUPPLY BOARD PICTORIAL... - Page 11 Notes Warranty...
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Page 12: Service Information / If You Need To Call For Help
SERVICE INFORMATION You may also contact the R.L. DRAKE Service Department by E-mail at the following address: The VM1550 Audio-Video Modulator has been designed and service@rldrake.com produced to provide trouble-free service. Should the need for repair arise, EXTREME CAUTION SHOULD BE USED TO or by Telefax: +1 (937) 743-4576. - Page 13 Warranty Warranty Three Year Limited Warranty R.L.DRAKE COMPANY warrants to the original purchaser this product shall be free from defects in material or workmanship for three (3) years from the date of original purchase. During the warranty period the R.L.DRAKE COMPANY or an authorized Drake service facility will provide, free of charge, both parts and labor necessary to correct defects in material and workmanship.
- Page 14 R.L. DRAKE COMPANY 230 Industrial Drive Franklin, Ohio 45005 U.S.A. Customer Service and Parts Telephone: +1 (937) 746-6990 Telefax: +1 (937) 743-4576 World Wide Web Site: http://www.rldrake.com...
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