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Adaption modes 1 and 2 offer intermediate levels of adaption.
The selection between the decoding modes is a subjective issue and will be largely
dependent on the demands of the application.
Switch no 4:
Set this switch on to kill TRS on the output when there is no input
present. Off to enable TRS's on the output when there is no input.
Switch no 3:
Set this switch on to blank line 21 Closed Captions (NTSC only), and off
to pass line 21.
Adjustments
Pots are labelled on board as Video gain, Chroma gain etc. and are mounted on the top
front edge of the PCB.
Video Gain:
Adjusts the gain of the input with a range of zero to double (+6dB) gain.
Held to pre-set value when hex switch is set to zero.
Chroma Gain: Adjusts the gain of the input with a range of zero to double (+6dB) gain.
Held to pre-set value when hex switch is set to zero.
Black Level:
Shifts the input with a range of -100mV to +100mV. Held to pre-set value
when hex switch is set to zero.
NTSC Hue:
In the NTSC standard only, allows the chroma phase to be adjusted up
to 90 degrees either side of normal. Held to pre-set value when hex
switch is at zero.
Multi-Use:
This is intended to provide various extra adjustments with the hex switch
selecting the function. As yet, no extra functions have been
implemented.
7
Document Number: DEC-6002UM2.doc Issue 2
24th March 1998
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