VM2550A
Drake
VM2550A
Drake VM-2550A RF Video Modulator
This is a high-quality, vestigial sideband modulator with synthesized visual and aural carriers. The frequency-agile unit features 82-channel coverage up to 550 MHz, allowing for front panel selection of standard CATV channel 2 to 78 and 95 to 99.
The VM2550A is designed to accept video and audio baseband signals from a satellite receiver or similar audio/video equipment. Both audio and video AGC can be selected to maintain nearly constant modulation levels. Audio input can be either unbalanced or balanced. A video low-pass filter and high-quality SAW filter eliminate adjacent channel interference.
These features, combined with a carefully designed output stage, provide reliable operation in a densely crowded or cable environment.
The VM2550A is designed to accept video and audio baseband signals from a satellite receiver or similar audio/video equipment. Both audio and video AGC can be selected to maintain nearly constant modulation levels. Audio input can be either unbalanced or balanced. A video low-pass filter and high-quality SAW filter eliminate adjacent channel interference.
These features, combined with a carefully designed output stage, provide reliable operation in a densely crowded or cable environment.
Note: The VER team recommends that you take advantage of our expertise by consulting with one of our wireless video engineers before each rental. Please ask your rental agent to facilitate this discussion. We look forward to satisfying your wireless video needs
Product Weight: 8.8 lbs
Dimensions: 19"W x 14.3"D x 1.75"H
Technical Tools
PDF Documents
Manufacturer Specs
Audio
Input level for 25 kHz Peak Deviation: -10 to +10 dBm manual gain adjustment with front panel metering or AGC
Audio AGC: Adaptive attack, slow release provides 25 kHz peak deviation for input levels of -10 to +10 dBm
Input Impedance: 600 Ω balanced, 300 Ω unbalanced
Pre-emphasis: 75 microsecond, can be disabled
Frequency Response: 50Hz to 15 kHz, +/-1 dB
Total Harmonic Distortion: 0.5% maximum
Hum and Noise: -60 dBm minimum, referenced to 25 kHz peak deviation 4.5 MHz audio input
Input Level: +38 dBmV +/-2 dB
Input Impedance: 75 Ω - Return loss greater than 20 dB with this port enabled
Visual IF Loop
Visual Carrier Frequency: 45.75 MHz
Frequency Stability: +/- 10 ppm
Output Level (45.75 MHz): +43 dBmV +/-2 dB
Spurious Outputs: -60 dBc minimum
Input Level (45.75 MHz): +43 dBmV
Input/Output Impedances: 75 Ω, return loss greater than 20 dB
Isolation: Greater than 60 dB
Aural IF Loop
Aural Carrier Frequency: 41.25 MHz nominal, (-4.5 MHz+/- 10 ppm of visual carrier frequency)
Output Level (41.25 MHz: +28 dBmV +/-3 dB Spurious Outputs: - 50 dBc minimum
Input Level (41.25 MHz: +28 dBmV nominal Input/Output Impedances: 75 Ω, return loss greater than 15 dB
Isolation: Aural carrier is greater than 60 dB below the visual carrier with loop open and terminated
Composite IF Loop
Output Level (V carrier): +28 dBmV +/- 2 dB
Spurious Outputs: -60 dBc minimum
Input Level (V carrier): +28 dBmV nominal +30 dBmV maximum
Input/Output Impedances: 75 Ω - Return loss greater than 30 dB
Isolation: Greater than 60dB
EAS Input
Input Level: +28 dbMV nominal
Input Impedance: 75 Ω - Return loss greater than 20 dB with this port enabled
Auto switching Level: Greater than 20 dBmV nominal
Isolation between Composite and EAS Inputs: Greater than 60 dB
General
AC Power Input: 115 VAC, +/-10%, 60 Hz, 30 Watts
Operating Temperature Range: 32 to 122 degrees F, ambient
Input level for 25 kHz Peak Deviation: -10 to +10 dBm manual gain adjustment with front panel metering or AGC
Audio AGC: Adaptive attack, slow release provides 25 kHz peak deviation for input levels of -10 to +10 dBm
Input Impedance: 600 Ω balanced, 300 Ω unbalanced
Pre-emphasis: 75 microsecond, can be disabled
Frequency Response: 50Hz to 15 kHz, +/-1 dB
Total Harmonic Distortion: 0.5% maximum
Hum and Noise: -60 dBm minimum, referenced to 25 kHz peak deviation 4.5 MHz audio input
Input Level: +38 dBmV +/-2 dB
Input Impedance: 75 Ω - Return loss greater than 20 dB with this port enabled
Visual IF Loop
Visual Carrier Frequency: 45.75 MHz
Frequency Stability: +/- 10 ppm
Output Level (45.75 MHz): +43 dBmV +/-2 dB
Spurious Outputs: -60 dBc minimum
Input Level (45.75 MHz): +43 dBmV
Input/Output Impedances: 75 Ω, return loss greater than 20 dB
Isolation: Greater than 60 dB
Aural IF Loop
Aural Carrier Frequency: 41.25 MHz nominal, (-4.5 MHz+/- 10 ppm of visual carrier frequency)
Output Level (41.25 MHz: +28 dBmV +/-3 dB Spurious Outputs: - 50 dBc minimum
Input Level (41.25 MHz: +28 dBmV nominal Input/Output Impedances: 75 Ω, return loss greater than 15 dB
Isolation: Aural carrier is greater than 60 dB below the visual carrier with loop open and terminated
Composite IF Loop
Output Level (V carrier): +28 dBmV +/- 2 dB
Spurious Outputs: -60 dBc minimum
Input Level (V carrier): +28 dBmV nominal +30 dBmV maximum
Input/Output Impedances: 75 Ω - Return loss greater than 30 dB
Isolation: Greater than 60dB
EAS Input
Input Level: +28 dbMV nominal
Input Impedance: 75 Ω - Return loss greater than 20 dB with this port enabled
Auto switching Level: Greater than 20 dBmV nominal
Isolation between Composite and EAS Inputs: Greater than 60 dB
General
AC Power Input: 115 VAC, +/-10%, 60 Hz, 30 Watts
Operating Temperature Range: 32 to 122 degrees F, ambient