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.
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| 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. |
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R.L. Drake, LLC |
Sales: 937-746-4556 |
