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Solid Signal > Commercial Equipment > Modulators and Demodulators > Drake VMM860

Drake Digital Fixed Channel Modulator (VMM860)
Drake Digital Fixed Channel Modulator (VMM860)

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Drake Digital Fixed Channel Modulator (VMM860)

Brand: Drake           P\N: VMM860          

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Availability: Usually Ships Same Day
Condition: New

Your Price: $11199

List Price: $150.00


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Drake The VMM860AG is an agile, high quality, vestigial sideband, heterodyne audio/video modulator with synthesized visual and aural carriers. One to twelve modulators or other accessories can be mounted in the same amount of rack space typically required for two standard size units. Ideally suited for private cable, hotels and motels, institutional, and SMATV applications, the VMM860AG accepts video and audio baseband signals from a satellite receiver, TV camera, videotape recorder, TV demodulator, or similar signal sources. Convenient Pushwheel Switches for Channel Selection.


  • Fixed Channel Modulator: comes in channels 87-135. Call to order the correct channel.

  • Front panel control of RF output level, A/V ratio, and video/audio modulation

  • Complies with FCC Rules Part 76

  • Use up to 12 VMM860AG modulators in a two rack height space powered by a single PSM121 Power Supply

  • Use up to 4 VMM860AG modulators in a one rack height space by using the RMM4 Rack and Power Supply

  • Rack mount and high capacity PSM121 Power Supply sold separately

  • Convenient Pushwheel Switches for Channel Selection

  • Standard CATV channels 87 - 135: must be ordered with correct channel.

  • IRC & HRC CATV channel formats selectable by internal jumper

  • Stereo ready utilizing BTSC stereo baseband. Rear panel pre-emphasis disable switch provided

  • Agility allows for "hot standby" solutions in headends

  • Agility allows for minimal service stock

  • An Economical NTSC vestigial sideband modulator

  • +45 dBmV output. Adjustable from +35 to +45 dBmV

  • SAW filtering for superior adjacent channel performance


Technical Data And Specifications

Frequency Range: 600 through 864 MHz
Frequency Selection: Set at factory to one of the following channels: Cable Channels 1 through 87 through 135 or UHF TV Channels 36 through 69
Output Level: + 45 dBmV minimum, Adjustable over a 12 dB range
Output Impedance: 75 Ohms, return loss of 12 dB
A/V Ratio: Audio Carrier - 10 to - 22 dB referenced to video carrier, adjustable
Frequency Stability: ± 5 kHz (Visual Carrier)
Intercarrier Frequency: 4.5 MHz, ± 50 Hz
FCC Frequency Offsets: All aeronautical channels are offset positive
Spurious Outputs: 54 to 1000 MHz - 65 dBc, measured at - 15 dB A/V ratio and with modulator output level of ± 45 dBmV
Broadband Noise: - 95 dBc, referenced to video carrier. (4 MHz BW and ± 36 MHz offset)
Input Level for 87.5% Modulation: 1 Vp-p ± 3 dB, manual gain adjustable with front panel control
Input Impedance: 75 Ohms, return loss of 18 dB minimum
Frequency Response: 20 Hz to 4.2 MHz, ± 1 dB
Video S/N: 65 dB minimum, luminance weighted
Differential Gain: ± 3% (10 to 90% APL)
Differential Phase: ± 3 degrees (10 to 90% APL)
C/L Delay: Within 50 nSec. Of 0 nSec. (standard), or FCC predistortion, (option)
Input Level for 25 kHz Peak Deviation: 100 mV to 2.5 Vrms, manual gain adjustment with front panel control
Input Impedance: 10 K Ohms, unbalanced
Pre-emphasis: 75 µS. (Defeatable via jumper for BTSC baseband stereo compatibility)
Frequency Response: 40 Hz to 15 kHz, ± 1.0 dB referenced to 75 µS pre-emphasis curve ( 40 Hz - 100 kHz ± 0.5 dB if pre-emphasis is defeated)
4.5 MHz Intercarrier Stability: ± 50 Hz, frequency synthesized
Total Harmonic Distotion: 0.5% maximun
Hum and Noise: -65 dB minimum, referenced to 25 kHz peak deviation
DC Power Input: + 12 VDC @ 150 to 220 mA, + 5 VDC @ 75 to 100 mA channel dependant
Operating Temperature: 0° to 50° Celsius
Dimensions: 3.5" H X 1" W X 7.5" D
Weight: 11 oz.


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