Specifications

Benhur Corporation – Multidyne, International Sales
18
VDA-220
The VDA-220 is an economical high performance distribution
amplifier ideal for applications where clamping and cable
equalization are required.
The DA is ideal for very long cable runs of up to 1500 feet to
monitors, for the distribution of color black burst reference
signals and for studio to studio distribution of video signals
where ground differences or DC off-sets may exist.
The clamp circuit in the FAST mode will remove differential
mode hum from the video signal on a line by line basis.
The DA will cancel up to 60 Volts of common-mode hum. The
units is also ideal for field, remote, sporting and ENG field
applications where multiple cable types may be in use.
The equalization feature compensates for up to 1500 feet of
cable losses for two type of cable.
The user can switch select cable equalizers for either 8281
and RG-59U or any two types of cable. Please specify the
cable type to be used.
The unit includes a differential loop-through input and eight
outputs with a front panel video presence LED.
The full line VDA-200 Distribution Amplifiers support the 75
Ohm coaxial distribution of AES/EBU digital audio signals.
The modular design is compatible with the MULTIDYNE UTIL-
200 and the Grass 8500/8800/8900 trays.
Specifications
Input
Type: 2 BNC Loop-through
Impedance: 75 Ohms
Return Loss: > 40 dB up to 5 MHz
Output
Type: 8 BNC
Impedance: 75 Ohms
Return Loss: > 40 dB up to 5 MHz
Performance
Bandwidth, 3 dB: 22 MHz.
Frequency Response
10 Hz to 5 MHz: +/-0.025 dB
5 MHz to 8 MHz: +/-0.05 dB
8 MHz to 10 MHz: +/-0.2 dB
18 MHz: -1 dB.
Clamp type: Back-porch, sampling, feedback.
Equalization Range:
8281 type cable 0 - 1500 Ft with single control;
RG- 59U type cable 0 - 1000 Ft with single control.
Equalization Accuracy:
10 Hz to 5 MHz: +/- 0.05 dB
5 MHz to 8 MHz: +/- 0.10 dB
8 MHz to 10 MHz: +/- 0.20 dB.
Differential Gain: <0.1 %
Differential Phase: <0.1°.
Line or Field Tilt: <0.5 %.
Signal to Noise: > 80 dB.
Common Mode Rejection (60 Hz): >66 dB. Return
Loss, to 5 MHz: >42 dB.
Power Consumption, MAX: 2 Watts
VDA-220
20 MHz, Field DA for Video, Pulse, Subcarrier and AES/EBU Digital Audio with
1500 Ft. Equalizer for 8281 & RG-59U cable & Back Porch Clamp, 1x8, Modular Card
Distribution Amplifiers, Automatic Gain, EQ