TRANSMITTER ADJUSTMENTS (continued)
FM VCO
FM
DEVIATION
RESIDUAL
AM
AM
MODULATION
CW
CARRIER
LEVEL
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
1
2
1
2
3
1
• Display frequency: 29.10000 MHz
• Mode : FM
• [Q1 RF POWER] : H
• [M4 TON] : OFF
• Apply no signal to [MIC] connector.
• Transmitting
• Display frequency: 29.10000 MHz
• Mode : FM
• [Q1 RF POWER] : H
• [M4 TON] : OFF
• [Q2 MIC GAIN] : 5
• Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV
• Transmitting
• Display frequency: 29.10000 MHz
• Mode : FM
• [Q1 RF POWER] : H
• [M4 TON] : OFF
• [Q2 MIC GAIN] : 5
• Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV and OFF
• Transmitting
• Display frequency
: 14.10000 MHz
• Mode : AM
• [Q1 RF POWER] : H
• [Q2 MIC GAIN] : 5
• Disconnect the plug from J281 on
the MAIN board.
• Apply no signal to [MIC] connector.
• Transmitting
• Connect the plug to J281 on the
MAIN board.
• Apply no signal to [MIC] connector.
• Transmitting
• Connect an audio generator to
[MIC] connector and set as:
1 kHz/30 mV
• Transmitting
• Display frequency: 14.10000 MHz
• Mode : CW
• [Q1 RF POWER] : H
• [Q5 KEY SPEED] : 60
• [M4 BRK] : BK
(semi break-in)
• CW paddle : n
• Connect an RF power meter to
[ANT1] connector.
• Transmit dots for a while using a
paddle.
MAIN
Rear
Panel
MAIN
Rear
Panel
Connect a digital
multimeter to check
point CP1011.
Connect an FM devi-
ation meter to [ANT1]
connector via an
attenuator.
Connect an RF
power meter to
[ANT1] connector.
Connect an osillo-
scope to check point
CP1041.
Connect an RF
power meter to
[ANT1] connector.
Connect a modula-
tion analyzer to
[ANT1] connector via
an attenuator.
Connect an osillo-
scope to check point
CP921 and [ANT1]
connector.
1.8 V
±4.5 kHz
Minimum power differ-
ence with modulation
and unmodulation.
100 mVp-p
35 W
90 % modulation
At the point where the
CW carrier completely
comes up in a 10
msec. delay after
CP921 voltage comes
up.
MAIN
MAIN
MAIN
MAIN
MAIN
C1022
R1002
adjust in
sequence
L511, L512,
then adjust
L562, L563,
L566.
R1042
R1080
R999
R921
After adjustment, varify the TRANSMIT TOTAL GAIN and OUTPUT POWER adjustments.
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