Kenwood TH-K20A Service Manual page 20

TH-K20A/K20E
Common Section
Item Condition
1. Setting 1) BATT terminal voltage: 7.5V
2) SSG standard modulation
[Wide]
MOD: 1kHz, DEV: 3kHz
[Narrow]
MOD: 1kHz, DEV: 1.5kHz
2. VCO Lock 1) Adj item: High
Voltage
Note:
• Press [Apply] button to store the adjustment value. (For single adjustment point)
• Press [Apply All] button to store the adjustment value after all adjustment points have been adjusted. (For 3 adjustment point)
Transmitter Section
Item Condition
1. Frequency 1) Tuning point: High
Press [Transmit] button.
2. High 1) Tuning point: Low, Center,
Transmit High (3 points)
Power and BATT terminal voltage: 7.5V
Protective Press [Transmit] button.
Current
3. Low 1) Tuning point: Low, Center,
Transmit High (3 points)
Power BATT terminal voltage: 7.5V
Press [Transmit] button.
4. Mid 1) Tuning point: Low, Center,
Transmit High (3 points)
Power BATT terminal voltage: 7.5V
Press [Transmit] button.
5. DCS 1) Tuning point: Low, Center,
Balance High (3 points)
[Wide] (Signaling Square Wave)
Deviation meter fi lter
LPF: 3kHz
HPF: OFF
Press [Transmit] button.
6. Maximum 1) Tuning point: Center, Low,
Deviation High (3 points)
[Wide] AG: 1kHz/150mV
Deviation meter fi lter
LPF: 15kHz
HPF: OFF
Press [Transmit] button.
20
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Power TX-RX ANT
meter
(CV)
Measurement
Test-
Unit Terminal
equipment
f. counter TX-RX ANT
Power
meter
Ammeter
Power TX-RX ANT
meter SP/MIC
connector
Deviation
meter
Oscilloscope
AG
AF VM
Adjustment
Parts Method
MCP- 4.0V
5T
[V] indicator on the
PC window shows
VCO lock voltage.
Change the adjust-
ment value to get
VCO lock voltage
within the limit of the
specifi ed voltage.
Adjustment
Unit Parts Method
MCP- 173.900MHz
5T
MCP- 5.5W
5T
1.0W
2.0W
MCP- Make the modulation
5T wave into square
waves.
4.0kHz
(According to
the larger +, –)
Specifi cations / Remarks
±0.1V
Press [Apply] button to store
the adjustment value.
Specifi cations / Remarks
±50Hz
±0.1W
2.0A or less
±0.1W
1.0A or less
±0.1W
1.5A or less
±100Hz