Olson Technology LCM-550x1-Series - Manual (Page 34)

025-000345 REV B Page 6
INTERNAL CONTROLS
Refer to the following figure for the location of the internal controls
Figure 2
The VID pot sets the video output level. The video level should be measured into a 75ohm load.
The SUB pot sets the subcarrier output level. It does not affect the audio level.
The AUD pot sets the audio output level in both the normal and multiplex modes. It may need adjustment when
changing between normal and multiplex outputs.
The SQL pot sets the low RF level where the outputs are squelched.
There are two jumpers that select the type of audio output. The AUD-SUB jumper selects between subcarrier
and baseband audio outputs. If this jumper is in the AUD position, then the MPX-NOR jumper selects the type of
baseband audio output.
The NOR position is normal audio output. In the MPX position, the audio de-emphasis is disabled. This is
used for multiplex BTSC stereo. In the multiplex mode, the audio pre-emphasis on the associated modulator should
also be disabled