User manual DRAKE DIGITAL VM2860

[. . . ] ® VM2860/VM2862 Commercial Video Modulator (For use in NTSC systems) Instruction Manual ® is a registered trademark of the R. L. Drake Company P/N: 3852471C-2-2003 Printed in the U. S. A. 2 Cautions Statements WARNING: TO PREVENT FIRE OR ELECTRICAL SHOCK DO NOT EXPOSE TO RAIN OR MOISTURE ¡WARNING! RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE POWER SUPPLY COVERS NO USER-SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL An appliance and cart combination should be moved with care. Quick stops, excessive force and uneven surfaces may cause the appliance 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. [. . . ] An overmodulation condition is noted with the red LED turned on continuously. The VIDEO LEVEL control should be set to a point where the red LED just remains off (see item F2). F4 - AUDIO LEVEL Control The setting of this screwdriver adjustment determines the audio deviation level. After installing the unit and with the audio source connected, adjust the AUDIO LEVEL control to a point where the green LED is turned on continuously and the red LED just remains off (25 kHz peak deviation). F5 - MODULATION Indicators (Audio) The green LED will be turned on continuously for peak deviations of approximately 2. 5 kHz (10% of 25 kHz maximum) or greater. An overmodulation condition is noted with the red LED turned on continuously. The AUDIO LEVEL control should be set to a point where the red LED just remains off (see item F4). F6 - A/V RATIO Control This screwdriver adjustment varies the level of the aural carrier over a range from 12 to 25 dB below the visual carrier. The aural carrier should be adjusted to approximately 15 dB below the visual carrier (normal operation). Clockwise rotation increases the aural carrier level and thus decreases the A/V ratio. F7 - EAS ACTIVE Indicator This indicator lights when a signal is present at the EAS input (R2) indicating that the modulator has switched to the EAS signal. F8 - CATV, CATV +100 CHANNEL Switch This two position switch allows selection of the desired operating channel from 02 to 99 (when the switch is in the CATV position) and channels 100 to 135 (when the switch is in the CATV +100 position). See the CHANNEL ASSIGNMENTS section for a list of the corresponding operating frequency, and offset, if any, for each channel number. F9 - CHANNEL Switch These pushwheel switches allow the selection of the desired operating channel from 01 to 135. See the CHANNEL ASSIGNMENTS section for a list of the corresponding operating frequency, and offset, if any, for each channel number. F10 - RF OUTPUT LEVEL Control This screwdriver adjustment varies the RF OUTPUT level. Clockwise rotation increases the level. Rear Panel Controls and Connections R3 R4 R8 5 R10 SAP LEVEL MADE IN THE U. S. A. BY SAP AUDIO IN L ® RF OUTPUT AUDIO IN R VIDEO IN SERIAL # EAS IN SAP OVERMODULATION OF FIRE-REPLACE FUSE AS MARKED AFTER DISCONNECTING UNIT FROM AC LINE. CAUTION:-RISK FUSE . 5 A / 250 V SLO-BLO 115 VAC, 60 Hz 27 WATT ATTENTION: -RISQUE D'INCENIDEREMPLACEZ FUSIBLE DU TYPE INDIQUÉ APRÉS DEBRANCHER DU SECTEUR. R1 R2 R5 R6 R7 R9 Figure 2 - REAR PANEL R1 - RF OUTPUT This is the modulator output, 54 to 864 MHz. R2 - EAS IN Connector Apply a 44 MHz (45. 75 MHz video carrier) signal at 30 dBmV to this input from an EAS IF modulator. R4 - SAP AUDIO IN * Apply the audio program for the SAP audio channel to this input. R5 - SAP OVERMODULATION * Indicates overmodulation of the SAP audio channel. R6 - AUDIO IN, L/R These are unbalanced audio inputs to the IF circuits. These "RCA" (phono) connector inputs accept baseband through 15 kHz audio at a nominal level of 250 mV RMS (approximately -10 dBu). R7 - VIDEO INPUT ("RCA" type or "F" type) These are used as the baseband input to the IF circuits. [. . . ] The unit must be sent to the following address: Service Department R. L. Be sure to include your street address which will be needed for UPS return. UPS Surface (Brown Label) takes 7-10 days to reach us depending on your location, Blue takes 2-3 days. Red is an overnight service. Send the unit in a way that it can be traced if we can't verify receipt of shipment. [. . . ]