CVA-3120
VA-700
I.R.T. Communications Pty Ltd | www.irtcommunications.com
Page 17 of 23
Revision 10
REMOTE GAIN CONTROL SUB-MODULE
(NOTE: Obsolete – No Longer Available. Information for existing modules only)
GENERAL DESCRIPTION
The CVA-3120 is a video gain sub-module designed to be fitted to the IRT VA-700 general purpose video
distribution amplifier to provide remote access to the gain of the VDA.
The control signal is completely separate to the video path and so does not cause noise in the video path. The
control signal is damped to prevent noise on the external control causing short term gain variations.
Control may be by either a DC control signal or via a simple potentiometer connected to the VDA. This makes the
control suitable for both direct manual use or for operation at remote locations using other methods to generate
the required DC control voltage.
The high performance of the sub-board results in no significant degradation in the performance of the VDA.
Standard Features:
•
Fits standard VA-700 Eurocard VDA.
•
Gain range
±
3 dB.
•
Noise free remote control via DC level.
•
Control by potentiometer or DC input.
Applications:
Centralised control for fast set-up of levels in:
•
O.B. vans.
•
Master control.
•
Camera gain matching.
CVA-3120 Sub-module
DC gain
controlled
amplifier
2
3
1
+12 Vdc
1 KOhm
0 to + 12 Vdc
Buffer amplifier
Input from
VA-700
VDA
input
stage
Output to
VA-700
VDA
output
stage