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METHOD OF ADJUSTMENTS
When marking adjustments, be sure the power supply is at the rated voltage and the room air is in normal condition with respect to temperature and humidity.
ADJUSTMENT OF RF TRAP UNIT (ETC(1658J) (ISSSI on,MODE .... mono)
Table 1
Adjustment
Item
Tuning
Input Side
Output Side
Adjustment
Point
Adjustment Value
Measuring
Instrument
Frequency
Input Level
Modulation
Connection
Point
Measuring
Instrument
Connection
Point
1
88 MHz
Tracking
Check
88.0
MHz
FM SSG
88.0 MHz
Variable depending
on output wave-
form attenuation
Mono
1 kHz
100%
Antenna
Terminal
Digital
Voltmeter
VC. G
—
3 V t 10 mV at the time of adjustment to the
max. point
of
output waveform attenuation
using the
ISSSf
controller
2
108 MHz
Tracking
Check
108.0 MHz
FM SSG
108.0 MHz
Variable depending
on output wave-
form attenuation
_ kHz
"'ono
1
100%
Mono
Antenna
Terminal
Digital
Voltmeter
G
—
20 V t 100 mV at the time of adjustment to the
max. point of output waveform attenuation
using the
SSS controller
3
If NG in items 1 and 2, advance to items
4
to 6
4
108 MHz
Tracking
108.0 MHz
FM SSG
108.0 MHz
Variable depending
on output wave-
form attenuation
Mono
1
kHz
100%
Antenna
Terminal
,
Oscilloscope
Output IL)
TC1
Output waveform attenuation is max. at
20 V i 50 mV
5
88 MHz
Tracking
88.0 MHz
FM SSG
88.0 MHz
Variable depending
on output wave-
form attenuation
Mono
1 kHz
100%
Antenna
Terminal
Oscilloscope
Output (LI
LI
Output waveform attenuation is max. at
3 V ± 5 mV
6
Repeat the adjustment in items 4 and 5 so that the waveform attenuation is maximum at the rated voltage
7
Adjustment
of
Attenuation
98.0 MHz
FM SSG
98.0 MHz
Variable depending
on output wave-
form attenuation
Mono
1 kHz
100%
Antenna
Terminal
Oscilloscope
Output ll..)
VRI
Adjust to max. attenuation after adjustment to
the max. point of output waveform attenuation
using the
SSS]
controller
Normal Output Waveform
Distortion of Output
Waveform due to Input Attenuation
Fig. 6
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