Toner Cable 300VMF+ User Manual

300VMF+

Commercial Video Modulator

969 Horsham Road lHorsham, Pennsylvania 19044 USA l Phone: [phone] Fax: [phone] [e-mail]

The DRACOM 300VMF+ fixed channel video modulator is a quality vestigial
sideband heterodyne audio/video modulator that provides a modulated visual
and aural RF carrier output on any single channel up to 552 MHz. The
300VMF+ is designed to accept video and audio baseband signals from a
satellite receiver, TV camera, or any compatible source.

Features

• Heterodyne conversion system, in conjunction with the use of a SAW filter, insures
optimum vestigial selectivity for adjacent channel headends.

• Accepts standard (sync. Negative) polarity video at 0.7 to 1.5 Vp-p level.

• All level controls are conveniently located on the front panel.

• High output power to +55 dBmV.

• A convenient monitor port is provided.

• Pre-emphasis may be disabled for special applications like an external stereo
generator.

• All aeronautical channels are offset positive with a tolerance of ± 5 kHz as
required by FCC rules.

• Rear Panel AC line convenience outlet.

Specifications Subject To Change Without Notice Rev 12-11 ©Toner Cable Equipment, Inc.

969 Horsham Road lHorsham, Pennsylvania 19044 USA l Phone: [phone] Fax: [phone] [e-mail]

RF

Frequency Range: 54 through 552 MHz.
Channels Available: CATV Channels 2 through 78 and 95 through 99
FCC Frequency Offsets: All aeronautical channels offset positive with a tolerance of ±5 kHz.
Output Level: +55 dBmV minimum, (typically adjustable from +43 to +55 dBmV).
Output Impedance: 75 Ohms; return loss of 14 dB nominal.
A/V Ratio: Audio Carrier -20 to -12 dB referenced to video carrier, adjustable.
Frequency Stability, Visual: Within ± 10 kHz of assigned channel frequency. Within ±5 kHz of

assigned channel frequency on FCC offset channels.
Aural Intercarrier Frequency: 4.5 MHz, ± 5 kHz.
Spurious Outputs: -60 dBc minimum, measured at -15 dB A/V ratio and with modulator

output level of + 55 dBmV.
In-Channel C/N: Better than 60 dB.
Broadband Noise: -95 dBc @ ± 30 MHz or greater spacings. (Specified levels are referenced

to the video carrier and measured in a 4 MHz bandwidth.)

Video

Input level for 87.5%
modulation: 1 Vp-p ± 3 dB, manual gain adjust with front panel control.
Input Impedance: 75 Ohms, return loss of 18 dB minimum.
Frequency Response: Flat ± 2 dB from 30 Hz to 4.2 MHz.
Video S/N: 60 dB minimum, luminance weighted.
L/C Delay: Within 50 nanoseconds of 0 nanoseconds L/C delay (complies with

FCC rule 76.605).
Differential Gain: Less than ± 5% (10 to 90% APL).
Differential Phase: Less than ± 5 degrees (10 to 90% APL).

Audio

Input Level for 25 kHz
Peak Deviation: 175 mV rms minimum. Manual gain adjustment with front panel control.
Input Impedance: 10K Ohms, unbalanced.
Pre-emphasis: 75 m Sec. (may be disabled with internal jumper change)
Frequency Response: 40 Hz to 15 kHz, ±1.5 dB, referenced to 75 m Sec. pre-emphasis curve.

4.5 MHz Intercarrier Stability: ±5 kHz, 0 degrees Celsius to + 50 degrees Celsius.
Total Harmonic Distortion: 1.5% maximum.
Hum and Noise: -60 dB minimum, referenced to 25 kHz peak deviation.

General

AC Power Input: 115 VAC ± 10%, 60 Hz, 10 Watts.
Operating Temperature Range: 0° to 50° Celsius, ambient.
Dimensions: 1.75 inches Height x 19 inches Width x 4.0 inches Depth.
Weight: 3.6 lbs.
Connectors: Video input, Audio Input, monitor and RF output are all type F.

Specifications

300VMF+

Commercial Video Modulator