Specifications

Benhur Corporation – Multidyne, International Sales
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VDA-8505
The VDA-8505 is an economical high performance distribution
amplifier ideal for applications where clamping and long range
cable equalization are required.
The DA is ideal for long range cable runs of up to 3500 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. For severe hum
problems, the VDA-8505 is optionally available with an Isolation
Transformer; option -TRANS. The rack-mounting kit for 5
transformers is option -RMTRANS.
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 3500 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.
The equalizer has switch selectable 1000 foot and 2000 foot fixed
equalization stages and a 1000 foot adjustable stage for fine
adjustments.
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 - 3500 Ft with single control;
RG- 59U type cable 0 - 3000 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
20 MHz, Long Range Field DA for Video, Pulse, Subcarrier and AES/EBU Digital Audio with
3500 Ft. Equalizer for 8281 & RG-59U cable & Back Porch Clamp, 1x8, Modular Card
VDA-8505
Distribution Amplifiers, Automatic Gain, EQ