Olson Technology OTM-4870 - Manual (Page 7)

025-000412 Rev. B Page 7
4) FRONT PANEL CONTROLS AND INDICATORS
OTM-4870 FRONT PANEL
REMOTE
The remote control feature is not available on the OTM-4870
UNLOCKED
This LED, when on, indicates that one of the digital synthesizers is not locked. This condition will result in
shutdown of the RF output as long as the condition exists. Note that this LED will usually flash on momen-
tarily when changing a channel or frequency. This momentary shutdown of the output prevents undesired
interference to other channels if the OTM-4870 is connected to a system or network when its channel is
changed.
VIDEO LEVEL
This control adjusts the video depth-of-modulation. Choose a bright scene (commercials are usually excellent)
and set it carefully while observing the VIDEO O/M LED. This control should be advanced to a point JUST
SHORT of where the VIDEO O/M LED flashes-on.
VIDEO O/M
This LED, when on, indicates a depth-of-modulation greater than 87-1/2%. It should never be on continuously
but might be on for short periods during bright scenes. See VIDEO LEVEL above.
This LED will stay on for several seconds when power is first applied to the OTM-4870.
AUDIO LEVEL
This control adjusts the audio deviation of the OTM-4870. Choose program material that is of high average
volume when setting this control and adjust it so the AUDIO O/M LED just blinks-on during program audio
level peaks.
AUDIO O/M
This LED, when on, indicates that the peak deviation of the OTM-4870 is at
±
25KHz. It should only flash-on
occasionally during normal operation. See AUDIO LEVEL, above.
A/V
This control adjusts the aural carrier level relative to the video carrier level. It is typically adjusted for an A/V
ratio of 15-17dB.
LEFT, RIGHT, UP, DOWN, ENTER
These buttons are used in selecting and changing menu items as displayed on the LCD panel.
CONTRAST
This control adjusts the LCD panel contrast. Adjust it for best display legibility when the OTM-4870 is placed
in operation.