DRACOM 300VMF+ Commercial Video Modulator
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.
- 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.
Download the owners manual (PDF)
| Dracom 300VMF+ Technical Specifications | |
|---|---|
| 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, price, and availability are subject to change without notice or obligation.
Drake Digital Solutions
Take control of your digital strategy with digital solutions from Drake. Our solutions help rural operators offer channel line-ups comparable to those found in larger urban markets.
Technical Support
Looking for answers? Manuals? How-to advice? Visit our Technical Support section and find the answers you're looking for.