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Keyer Subpanels
KEY ON Indicator
The KEY ON indicator lamp displays whether the delegated keyer
is in use or not. This indicator is a logical AND of the ON indicator
in the transition subpanel and the keyer delegation selection.
Key Type Buttons
The second row of buttons from the bottom
of each Keyer subpanel selects one of five
keyer modes.
Pressing the LIN KEY button selects a linear key with a gain fixed
at unity, clip fixed at 50%, and no S-shaping. The LIN KEY lamp
(only) is illuminated when this linear key is selected.
If a linear key is desired, but the key signal is not at the correct
level, adjustments can be made with the CLIP and GAIN knobs.
CLIP adjusts the offset of the key signal (over a small range) in
linear key mode. GAIN adjusts the amplitude of the key signal
(over a small range).
If either knob is adjusted away from unity, the LUM KEY button
lights in addition to the LIN KEY button lamp. When both buttons
are illuminated, that indicates to the operator that a linear key is
being performed with non-unity gain and/or clip. If key memory
is on, the non-unity clip and gain settings are recalled whenever
the input associated with these settings is selected.
When gain and clip are returned to unity, the LUM KEY button
lamp goes off. Because it is difficult to adjust the knobs back to
exact unity, provision is made to force the unity values by pressing
the LIN KEY button a second time while the button is lit. This
action restores unity and turns off the LUM KEY button lamp.
The LUM KEY button selects a luminance key that has variable clip
and gain adjustment and S-shaping of the key signal. Key CLIP
(offset) and GAIN (amplitude) settings are remembered for each
source on each keyer when key memory is enabled via the
KEY
ON
LIN
KEY
SEC
PST
PTTN
CHR
KEY
PRI
PST
PTTN
LUM
KEY
LIN
KEY
CLIP
GAIN
LUM
KEY