Page 54
Pyramid 2 Keyboard
Installation and Operating Instructions
SETTING SIGNAL GAIN AND LIFT LEVELS
Pyramid AC and DC receivers have Gain and Lift amplifiers, and they can be remotely controlled using the Pyramid 2
Keyboard. Using the keyboard controls, the Gain and Lift amplifiers can be used to compensate for signal reductions
caused by transmission over coaxial cables. They should not be used to compensate for poorly auto-iris levels, and should
only be used once the levels have been measured at the matrix location with an oscilloscope or video level meter.
Gain is used to increase (or decrease) the video gain on a receiver. Whilst it adjusts the whole of the video signal, it is best
to increase the Gain until the sync level is set at 300mV. This is because the sync is a constant level in the video signal,
whereas the video content (luminance) is dependant on the scene content.
Lift is used to increase (or decrease) the high frequency gain of the video signal from a receiver. This has the effect of
increasing the edge sharpness in the image and also the colour saturation. The most reliable way of setting Lift is to set the
colour burst level to 300mV. This is because the burst is a constant high frequency component of the signal.
To set the Gain and Lift amplifier for a receiver, follow the steps below:
1. Select the PTZ camera to which the receiver is attached - see
Selecting a Camera
on page 14.
2. Press the
Utility Menu
screen key.
3. Press the
Receiver Utilities
soft-key.
4. Press the
Level Set
soft-key. The
Gain/Lift Levels
screen is displayed (Figure 77).
VCR / MUX
Operator
Utility Menu
12...
12...
12...
12...
VCR / MUX
Utility Menu
Operator
Figure 76 - Accessing the Gain/Lift Levels Screen
4
2
5. Using the appropriate soft-keys, adjust the
Gain
to acquire the best possible picture.
6. Using the appropriate soft-keys, adjust the
Lift
to acquire the best possible picture.
7. Press the
Utility Menu
screen key to leave the
Gain/Lift Levels
screen.
VCR / MUX
Operator
Utility Menu
Gain
I
----------------------------------------------
Lift
I
----------------------------------------------
-
-
+
+
Figure 77 - Gain/Lift Levels Screen
5
6
7
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