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Solid Signal > Commercial Equipment > Modulators and Demodulators > Drake 300VMF

Drake Digital Fixed Modulator (300VMF)
Drake Digital Fixed Modulator (300VMF)

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Drake Digital Fixed Modulator (300VMF)

Brand: Drake           P\N: 300VMF+          

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Availability: Discontinued

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Drake The DRACOM 300VMF+ is a professional and economical, fixed channel, audio/video modulator. The 300VMF+ is designed to accept video and audio baseband signals from a satellite receiver, TV camera, or similar source. It incorporates vestigial sideband, a heterodyne conversion system, and a SAW filter for adjacent channel operation with excellent signal quality. Provided is a modulated visual and aural RF carrier output on any single CATV channel up to 552 MHz.


  • SAW Filtered

  • Hetrodyne conversion

  • 19" rackmount, 1RU

  • 55 dBmV output

  • 54-552 MHz

  • Channels 2 through 78


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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