Obscura-2 video scrambling system
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Obscura Video Scrambling System


Obscura-2 is a low-cost video scrambling system designed to protect wireless video surveillance transmissions from casual interception.

Obscura-2 utilises static line cut and rotate video scrambling offering a high level of picture concealment coupled with excellent link compatibility. To enhance security, the cut point sequence used is randomly changed each time the system is powered up.

Obscura-2 is extremely simple to install. The encoder is inserted into the video path to the transmitter whilst the decoder is connected to the output of the receiver. Only a DC supply of 7 to 32 volts is then required to operate the system. Obscura is also suitable for long term battery operation, drawing less than 50 mA from a 12 volt supply.

Obscura Video Scrambling

Each Obscura-2 video scrambling unit includes two scrambling keys. An internal group key, allocated in the factory, and a second user key that is set by four hex switches on the side of the unit. Only if both the encoder and decoder group and user keys match will the system be able to de-scramble the transmission.

The Obscura-2 video scrambling system is ideal for safeguarding wireless video security links from reception by scanners and other microwave video receivers.


Obscura System Diagram

Obscura System Diagram


Obscura Dimensions and Interfaces


Obscura Dimensions & interfaces



Obscura Specifications

Mechanical size (ex connectors) 89 x 54 x 20 mm
Mechanical size (inc connectors) 110 x 54 x 20 mm
Operating temperature range -10 to +55 deg C
Finish Anodised aluminium
Weight 125g (approx)
DC power requirement

7 to 32 V DC at < 0.6 Watts
(e.g. < 50 mA at 12 V).

Standard accessories User guide, DC power lead
Video standards supported PAL
Video connectors BNC
Video input / output levels 1 Vpp 75 ohm
Video scrambling method Static line cut & rotate
Lock-in time < 500mS
Encryption Fixed sequence with random start point at power up.
Signal to noise ratio > 55 dB (weighted)
Audio Not Supported


Due to continual product development Ovation Systems reserve the right to change specifications without notice. E&OE.