5
Pressing the F3/F6 Key will allow programming the silence interval. Select the desired
interval using the UP and DOWN arrow keys. The interval can be set to any time
between 30 and 600 seconds (Default = 60 seconds) using the UP and DOWN arrow
keys. Pushing the ENTER key will put this setting into non-volatile memory. Pushing the
red X key will return to the original value before it was changed. NOTE: the ENTER key
MUST be pushed to retain this setting after power is cycled. This allows the user to test
a setting before committing it to memory.
C. Silence Threshold Programming
OUTPUT LEVEL = 341
SILENCE LEVEL = 5
Figure 4 - ATB-300 Silence Threshold Programming Mode Display
Pressing the F3/F6 Key again will allow programming of the silence detect level. The
upper line of the LCD indicates the level of the currently selected input for comparison
purposes. The lower line indicates the current threshold below which a channel will be
considered INACTIVE. The relative level can be set to any time between 1 and 100
(Default = 5 = - 40 dB below nominal input) using the UP and DOWN arrow keys.
Pushing the ENTER key will put this setting into non-volatile memory. Pushing the red X
key will return to the original value before it was changed. NOTE: the ENTER key
MUST be pushed to retain this setting after power is cycled. This allows the user to test
a setting before committing it to memory.
Manual operation is also available using the rear panel remote connections. See
“Remote Operation” for details
NOTE: The ATB-300 has an internal 2 pin jumper installed on the back of the front
panel board in the upper right hand corner near the power connector.
Removing this
jumper will disable front panel programming of the silence detect time and activity
threshold to prevent unauthorized changes.
ATB-300 Auto Mode
Pushing the F1/F4 key will alternate between the manual and auto modes. In auto mode
the display will indicate the currently selected channel and its activity status. The lower
line indicates the status of the priority memories and the activity status of the input
channel programmed into them. Pushing the UP and DOWN keys will allow previewing
the contents of each priority memory.
