3. INSTALLATION – AUDIO LEVEL SETTINGS
METHOD 1：
Connect the STEREO ENCODER, Audio/Video Modulator, compatible DC power source,
video source signal and test equipment as shown.
Make certain that the audio response of the A/Vmodulator is set for ‘FLAT’ (pre-emphasis
defeated).
1. Set the ‘Test Tone’ switch on the front panel of the STEREO ENCODER to the ‘ON’
position.
2. Using the connected spectrum analyzer, tune the aural carrier to the center of the screen.
Spectrum Analyzer Settings.
SPAN：100 KHz
Res BW：1 KHz
SWEEP：300 mSec.
VBW：1 KHz
3. Adjust the ‘Audio’ control on the front panel of the connected A/V modulator for a setting
that nulls the aural carrier. If more than one null is found, use the lowest audio gain setting
that produces a null of the aural carrier.
4. INSTALLATION – AUDIO LEVEL SETTING, continued
4. Set the STEREO ENCODER TEST TONE switch to the ‘OFF’ position. Connect Left and
Right audio source signals to the STEREO ENCODER.
5. Set the ‘Audio LEVEL’control on the STEREO ENCODER to a point where the
‘OVERMODULATION’ indicator just remains off or flashes occasionally.
The system audio levels are now properly set.
Disconnect the test equipment.
METHOD 2：(If a spectrum analyzer is not available)
1. Connect the STEREO ENCODER, A/V modulator, compatible DC power source, and
video source signal as shown on this page. Keep the ‘TEST TONE’ switch ‘OFF’ for this
procedure.
2. Connect a TV receiver (with MTS stereo capability) to the A/V modulator. Tune the TV
receiver to the samechannel as the modulator output.
NOTE：Make certain that the audio response of the A/V modulator is set for ‘FLAT’
(pre-emphasis defeated).
3. Connect the audio source signal (not a tone) to either the LEFT or the RIGHT Audio Input
of the STEREO ENCODER.
4. Set the ‘Audio LEVEL’control on the STEREO ENCODER to a point where the
‘OVERMODULATION’ indicator just remains off or flashes occasionally.
5. While monitoring the opposite audio channel from the TV receiver audio output, set the
‘Audio’ level control on the A/V modulator for a maximum (stereo) separation condition.
SPECTRUM ANALYZER
Loop-Through
REAR PANEL
AUDIO INPUT
POWER IN
COMPOSITE
AUDIO OUT
MODULATOR
STEREO ENCODER A/V
AUDIO Cable
DC IN
VIDEOINPUT
VIDEO SOURCE
LOCK
POWER
PILOT
RIGHT/LEFT
REAR PANEL
STEREO ENCODER A/V
MODULATOR
DC INPUT
AUDIO CABLE
TO system Distribution
AUDIO SOURCE
DC INPUT
or TVReceiver
VIDEO IN
Loop-Through
AUDIO OUT
COMPOSITE
VIDEO SOURCE
VIDEO IN
AUDIO IN
MOD
OVER-
LOCK
POWER
PILOT
AUDIO
LEVEL
