Drake VMM860 Fixed Channel Modulator

The VMM860 is a high quality fixed channel heterodyne audio/video modulator. One to twelve modulators can be mounted in the same amount of rack space typically required for two standard size units.
Manufacturer: Drake
$110.00
Availability: In stock
SKU
VMM860
Manufacturer: Drake

Drake VMM860 Fixed Channel Modulator

The Drake VMM860 Video Modulator is a professional quality modular headend system designed to optimize rack space. The VMM860 is a high quality fixed channel heterodyne audio/video modulator. One to twelve modulators 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 VMM860 accepts video and audio baseband signals from a satellite receiver, TV camera, videotape recorder, TV demodulator, or similar signal sources.

  • Low-cost NTSC modulator
  • +45 dBmV output. Adjustable from +30 to +45 dBmV
  • SAW filtering for superior adjacent channel performance
  • Front panel control of RF output level, A/V ratio, and video/audio modulation
  • Complies with FCC Rules Part 76
  • Rack mount and power supply sold separately

VMM860 Technical Specifications

RF

Frequency Range:

601 through 860 MHz.

Frequency Selection:

Set at the factory to one of the following channels:
Cable Channels 87 through 135
or UHF TV Channels 36 through 69

Output Level:

+45dBmV minimum, typically adjustable from +30 to +45 dBmV

Output Impedance:

75 Ohms, return loss of 12 dB

A/V Ratio:

Audio Carrier -22 to -10 dB referenced to video carrier, adjustable

Frequency Stability:

± 5 kHz (Visual Carrier)

Intercarrier Frequency:

4.5 MHz

FCC Frequency Offsets:

All aeronautical channels are offset positive

Spurious Outputs:

-65 dBc, measured at -15 dB A/V ratio and with modulator output level of +45 dBmV

Broadband Noise:

-95 dBc (4MHz bandwidth, ±12MHz offset)

Video

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 luminance weighted

Differential Gain:

± 3% (10 to 90% APL)

Differential Phase:

± 3 degrees (10 to 90% APL)

Audio

Input Level for 25 kHz Peak Deviation:

140 mV minimum. Manual gain adjustment with front panel control

Input Impedance:

10K Ohms, unbalanced

Pre-emphasis:

75 µSeconds (Defeatable via internal jumper for BTSC baseband compatibility)

Frequency Response:

40 Hz to 15 kHz, ± 1 dB referenced to 75 µ Seconds pre-emphasis curve. (20 Hz to 100 kHz if pre-emphasis is defeated.)

Intercarrier Stability:

± 5 kHz, 0° to 50° Celsius (32° to 122° Fahrenheit)

Total Harmonic Distortion:

0.5% maximum

Hum and Noise:

-65 dB minimum, referenced to 25 kHz peak deviation

General

DC Power Input:

+12 VDC @ 150 to 220 mA, +5 VDC @ 75 to 100 mA

Operating Temperature:

0° to 50° Celsius (32° to 122° Fahrenheit), ambient.

Dimensions:

3.5 inches (89 mm) Height x 1 inch (25 mm) Width x 7.5 inches (191 mm) Depth

Weight:

10.7 ounces (0.30 kg.)

Specifications, price, and availability are subject to change without notice or obligation.

Manufacturer: Drake
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ManufacturerDrake
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