DRAKE 300VMFPLUS Instruction Manual Download | Manualshive

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Instruction Manual

TM

is a trademark of the R.L. Drake Company

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

300VMF

+

Commercial Video Modulator

(For use in NTSC systems)

TM

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Summary of Contents for 300VMFPLUS

Page 1: ...Instruction Manual TM is a trademark of the R L Drake Company Copyright 2005 R L Drake Company P N 3853616D 10 2005 300VMF Commercial Video Modulator For use in NTSC systems TM ...

Page 2: ...ccordance 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...

Page 3: ...to video carrier adjustable Within 10 kHz of assigned channel 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 1 Vp p 3 dB manual gain adjust with front panel control 75 O...

Page 4: ...ontrol for the correct percentage of modulation 87 5 If test equipment is not available for such measurements then adjust for proper picture contrast when viewed on a TV set compare with known off air broadcast picture quality F1 F2 F3 F4 F5 F6 F7 Figure 1 F1 POWER Indicator Lights when the unit is connected to a source of AC power F2 OUTPUT TEST Connector Provides a reduced level sample of the RF...

Page 5: ...ximately 10 dBu If a separate BTSC stereo encoder such as the Drake MMTS20 is to be used with this modulator this jack can input 40 Hz through over 50 kHz with flat response if internal jumper J8 is set to flat see below R3 RF OUTPUT This is the modulator output INTERNAL JUMPER SETTING AUDIO RESPONSE Internal jumper J8 may be used to disable the 75 uSec pre emphasis normal setting Flat response ma...

Page 6: ...OTES Level adjustment provides optimum performance in multichannel installations The modulator outputs should be checked periodically with a spectrum analyzer to maintain a 1 dB variation of adjacent channel carriers Aural Visual A V ratios should be held to 15 dB or less The RF Output Level and A V Ratio controls are used respectively to make these adjustments If an output level of less than 43 d...

Page 7: ...NONE NONE 25 25 EIA Channel 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 95 96 97 98 99 Visual Carrier MHz 55 25 61 25 67 25 77 25 83 25 175 25 181 25 187 25 193 25 199 25 205 25 211 25 121 25 127 25 133 25 139 25 145 25 151 25 157 25 163 25 169 25 217 25 223 25 229 25 235 25 241 25 247 25 253 25 259 25 265 25 271 25 277 25 283 25 289 25 ...

Page 8: ...orking days after it arrives at R L DRAKE if we have all the facts If we must call you it may take longer R L DRAKE is not responsible for damage caused by lightning nonprofes sional alterations acts of God shipping damage poor storage handling etc R L DRAKE will make note of any shipping damage upon receipt You will need to send proof of purchase to receive warranty service Typically a copy of th...

Page 9: ...ance repair anduseareimportanttoobtainproperperformancefromthisproduct Thereforecarefully read the Instruction Manual This warranty does not apply to any defect that R L DRAKE COMPANY determines is due to 1 Improper maintenance or repair including the installation of parts or accessories that do not conform to the quality and specifications of the original parts 2 Misuse abuse neglect or improper ...

Page 10: ...R L Drake Company 230 Industrial Drive Franklin Ohio 45005 U S A Customer Service and Parts Telephone 1 937 746 6990 Telefax 1 937 806 1576 World Wide Web Site http www rldrake com ...

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