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5 - 9
F4/S
• MAIN unit
connect
(soldering) here
DC power supply
,
.
see detailed illustration
below
Power supply connection
VR board
connect (soldering)
,
line here
R150
DTCS wave
form adjustment
R119
Frequency deviation
adjustment
FM deviation
meter
Oscilloscope
RF power meter
Attenuator
Audio generator
AC millivoltmeter
C467*
*
Other side of this
point.
Transmit output
power adjustment
The following adjustment must be performed after “REFERENCE FREQUENCY ADJUSTMENT” in section 5-7.
Set to flat wave
form
5-8 TRANSMITTER ADJUSTMENT for IC-F4/S
FM
DEVIATION
DTCS WAVE
FORM
1
1
• Operating freq. :
400.000 MHz (L-band)
440.000 MHz (ML-band)
470.000 MHz (MH-band)
490.000 MHz (H1/H2-bands)
• High/Low switch : Low
• Connect an audio generator to the
[MIC] jack and set as:
1 kHz/150 mV
• Set an FM deviation meter as:
HPF
: OFF
LPF
: 20 kHz
De-emphasis : OFF
Detector
: (P–P)/2
• Transmitting
• Operating freq. :
415.000 MHz (L-band)
455.000 MHz (ML-band)
485.000 MHz (MH-band)
501.000 MHz (H1-band)
505.000 MHz (H2-band)
• High/Low switch : Low
• No audio applied to the [MIC] jack.
• DTCS code
: 007
• Transmitting
Top
panel
Top
panel
Connect an FM devia-
tion meter to the
antenna connector
through an attenuator.
Connect an FM devia-
tion meter with an
oscilloscope to the
antenna connector
through an attenuator.
MAIN
MAIN
R119
R150
ADJUSTMENT
ADJUSTMENT CONDITIONS
UNIT
LOCATION
VALUE
UNIT
ADJUST
MEASUREMENT
ADJUSTMENT
±4.1 kHz
(W-type)
±2.1 kHz
(N-type)
Summary of Contents for IC-F3
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