User manual DRAKE DIGITAL VMM860AS

[. . . ] Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusions or limitation of incidental or consequential damages, so the above limitation and exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. This warranty shall be construed under the laws of Ohio. POWER SUPPLY MODULATOR AUDIO 12 POSITION RACK MOUNT POWER SUPPLY MODULATOR AUDIO MODULATOR AUDIO MODULATOR AUDIO MODULATOR AUDIO MODULATOR AUDIO MODULATOR AUDIO MODULATOR AUDIO MODULATOR AUDIO VMM806AG VIDEO MODULATOR AUDIO MODULATOR AUDIO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO VIDEO POWER PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V PWR A/V PWR ERROR AUDIO A/V VIDEO PWR A/V PWR A/V # CH RF # CH RF # CH RF # CH RF # CH RF # CH RF # CH RF # CH RF # CH # 2 RF CATV CATV +100 BC TV # CH RF RF 5 CH A/V RF 4 POSITION RACK MOUNT OR VMM860AG, VMM860AS and other compatible modular units POWER SUPPLY AUDIO AUDIO VIDEO VIDEO AUDIO AUDIO POWER ERROR POWER ERROR VIDEO VMM806AG VMM806AG VMM806AG VMM806AG VIDEO POWER ERROR POWER ERROR BC TV BC TV BC TV 5 A/V 5 A/V 5 A/V 5 BC TV A/V RF RF RF CATV CATV CATV CATV +100 CATV +100 CATV +100 CATV 2 2 2 2 The VMM860AG and VMM860AS modulators are members of the R. L. Drake 19" Mini-Rack Series, a professional quality modular headend system designed to optimize rack space. [. . . ] A/V Ratio: Audio carrier level, adjustable from -22 to -12 dB referenced to video carrier level. Frequency Stability: Within ±5 kHz Output Flatness: From 54 to 864 MHz, less than 3 dB change. Output Amplitude Stability: ±1 dB Intercarrier Frequency: 4. 5 MHz Spurious Outputs (5 to 900 MHz): -60 dBc, (-15 dB A/V ratio and output level of +45 dBmV). VIDEO Input Level for 87. 5% Modulation: Video Over-modulation LED: Input Impedance: Frequency Response: C/L Delay: Differential Gain: Differential Phase: Figure 1 F1 - POWER/ERROR Indicator Lights when the unit is connected to the required source of DC power via the rear panel DC INPUT connector. A flashing condition indicates an invalid channel setting or other conditions that would cause the unit to operate on an invalid channel. F2 - AUDIO Level Control The setting of this screwdriver adjustment determines the aural carrier deviation. F3 - VIDEO Level Control The setting of this screwdriver adjustment determines the video modulation level. F4 - Channel Number Switch Sets the desired operating channel for standard CATV channels 02 through 135 or Broadcast TV channels 02 through 69. See also Item F5 which sets the type of channel (CATV or Broadcast TV) and sets the leading "1" for CATV channels 100 through 135. Setting for CATV channel "125"Setting for CATV channel "25"0. 65 Vp-p to 1. 5 Vp-p. 30 maximum (10 to 90% APL). 2 CATV CATV +100 5 BC TV CATV +100 2 CATV 5 BC TV F6 - A/V Ratio Control This screwdriver adjustment varies the level of the aural carrier over a range from 12 to 22 dB below the visual carrier. Typically, the aural carrier should be adjusted to approximately 15 dB below the visual carrier. F7 - RF Output Level This screwdriver adjustment permits adjustment of the RF output level over a minimum of 10 dB range. LK (Pilot Lock) This LED indicates that the BTSC circuitry in the VMM860AS has locked to the video sync reference. F9 - Audio Overmodulation This LED illuminates when the audio input level reaches full modulation. (VMM860AS) F10 - Video Overmodulation This LED illuminates at 87. 5% video modulation. Advance F3 CW until F10 just lights then back off until F10 just goes out. (VMM860AS) AUDIO, VMM860AG Input Level for +/- 25 kHz Deviation: 125 mV rms to 2. 5 V rms. [. . . ] R3 - DC INPUT Connector This 3-pin connector (Male) accepts the appropriate mating DC power cable. This switch allows selection of either normal audio pre-emphasis or flat audio response. If the MMTS20 BTSC stereo encoder is used, set this switch to FLAT and connect stereo audio to the MMTS20. This is the an unbalanced input for the right channel stereo audio. INTERNAL JUMPER SETTING: STD, HRC, IRC STD HRC IRC Drawing is not to scale. [. . . ]