Datasheet

LongReach 16 Active CCTV Receiver Hub

Automatic Image Adjustment (AGC)

The LongReach 16 has auto-gain control (AGC) that automatically optimizes the video output

signal according to the cable length and other factors that affect signal transmission such as

temperature and cable grade. The AGC optimizes the brightness and sharpness levels of the

video signal so that the image is as good as if the adjustments were performed manually. As

cable length increase, AGC compensation increases as illustrated below.

Due to the real time processing of the signal, there is brief time delay before the image is

stabilizes. This may take a two to five seconds. Once the image has stabilized it remains locked

to that setting even if the camera is disconnected from the CCTV hub as shown in the following

diagram.

However, if the hub is powered off and on, or a hub port is connected to a different camera,

then the AGC will readjust again. AGC re-adjusts when the signal input levels and/or cable

length changes.

Optimum Brightness

Optimum Sharpness

Time

AGC

Brightness

Sharpness

Cable length

AGC