EMCEE Broadcast Products TTU500FA ユーザーズマニュアル
MODEL 2000 TELEVISION MODULATOR
Page 6
Revised June 1999
NOTE: All connectors are standard “F”, and mating connectors should be lightly wrench tightened and
properly crimped to the cable.
CONTROLS:
All operating controls and indicators are present on the front panel except for the audio select switch which
is located on the rear panel of products with certain audio options such as subcarrier inputs.
is located on the rear panel of products with certain audio options such as subcarrier inputs.
FRONT PANEL CONTROLS AND INDICATORS (LEFT TO RIGHT):
POWER INDICATOR: located on the left side of the front panel.
AUDIO:
DEViation: Screwdriver slotted control for setting the deviation of the audio carrier. Clockwise increases
deviation.
deviation.
OVERdeviation: Red indicator which will illuminate to indicate excessive deviation of the audio carrier.
Operation occurs at ±25kHz for NTSC (U.S.) or ±50kHz (most PAL). Proper setup will allow brief flashing
on the loudest portions of program material. Setup can be verified with a spectrum analyzer or some signal
strength meters.
Operation occurs at ±25kHz for NTSC (U.S.) or ±50kHz (most PAL). Proper setup will allow brief flashing
on the loudest portions of program material. Setup can be verified with a spectrum analyzer or some signal
strength meters.
VIDEO:
MODulation: Screwdriver slotted control for setting video modulation percentage (modulation depth).
Clockwise increases modulation.
Clockwise increases modulation.
OVERmodulation: Red indicator which will illuminate to indicate excessive modulation. NOTE: The video
signal must contain significant amounts of peak white for an accurate reading to be obtained. Monitoring
the signal with a picture monitor (television) while adjusting to make certain that the picture contains
significant white areas will assure reasonable adjustment. Picture contrast can also be judged and examined
for signs of overmodulation of peak whites.
signal must contain significant amounts of peak white for an accurate reading to be obtained. Monitoring
the signal with a picture monitor (television) while adjusting to make certain that the picture contains
significant white areas will assure reasonable adjustment. Picture contrast can also be judged and examined
for signs of overmodulation of peak whites.
The most accurate means of setting video modulation is with a spectrum analyzer to set modulation depth
to 87.5 percent (analyzer set to linear detector) or 18dB (with the analyzer set to log detector). Some modern
signal strength meters are capable of reasonably accurate modulation measurement.
to 87.5 percent (analyzer set to linear detector) or 18dB (with the analyzer set to log detector). Some modern
signal strength meters are capable of reasonably accurate modulation measurement.
AUDIO SUBCARRIER LEVEL: Screwdriver slotted control for setting the level of the audio carrier (video
carrier to audio carrier ratio). Clockwise rotation will increase the carrier thus reducing the ratio between
video and audio. This control is used to set the audio carrier output level on product without composite
outputs. Proper adjustment requires a spectrum analyzer or a calibrated tunable signal level meter.
carrier to audio carrier ratio). Clockwise rotation will increase the carrier thus reducing the ratio between
video and audio. This control is used to set the audio carrier output level on product without composite
outputs. Proper adjustment requires a spectrum analyzer or a calibrated tunable signal level meter.
OUTPUT LEVEL: Screwdriver slotted control for setting the composite output level for products so equipped
or setting the video carrier level on products without a composite output. Clockwise rotation increases the
output level. Proper adjustment depends on requirements of the equipment being driven. Although
adjustment range exceeds 20B, it is recommended in cases that require significant reduction of 10dB or
greater from the nominal rated output of the exciter that a fixed attenuator should be used instead of using
or setting the video carrier level on products without a composite output. Clockwise rotation increases the
output level. Proper adjustment depends on requirements of the equipment being driven. Although
adjustment range exceeds 20B, it is recommended in cases that require significant reduction of 10dB or
greater from the nominal rated output of the exciter that a fixed attenuator should be used instead of using