Kenwood TH-K20A, Service Manual

Page: 21 / 40

TH-K20A/K20E
21
ADJUSTMENT
Item Condition
Measurement Adjustment
Specifi cations / Remarks
Test-
equipment
Unit Terminal Unit Parts Method
7. Battery
Detection
Check
(User mode)
1) BATT terminal voltage: 7.1V
PTT:
ON
TX Power: Low
Battery type: Li-ion
Power
meter
DVM
TX-RX ANT
BATT
terminal
Check Segment display: 4 dots
2) BATT terminal voltage: 7.8V
PTT:
ON
TX Power: Low
Battery type: Li-ion
Segment display: 9 dots
• This transceiver is designed to make adjustments simple.
• It is not necessary to adjust the fi xed values for the DTMF-DEV, DQT-DEV, QT-DEV, and MIC sensitivity.
• The TX-DEV Narrow setting uses the Wide calculated adjustment level value.
Receiver Section
Item Condition
Measurement Adjustment
Specifi cations / Remarks
Test-
equipment
Unit Terminal Unit Parts Method
1. Band Pass
Filter
1) Tuning point: Low, Center,
High (3 points)
SSG output: –90dBm
(7.08µV)
SSG DEV: 3.0kHz
SSG
DVM
Oscilloscope
AF VM TX-RX ANT
SP/MIC
connector
MCP-
5T [Automatic Adjust-
ment]
Press [Start] button
of “Auto Tuning”.
Press [Apply] button
to store the adjust-
ment value after the
automatic adjust-
ment has fi nished.
2. Sensitivity
Check
[Narrow] 1) Tuning point: Low, High
(2 points)
SSG output: –120dBm
(0.22µV)
SSG DEV: 1.5kHz
Check 12dB SINAD or more
3. Squelch
Level 2 Write
[Wide]
1) Tuning point: Low, Center,
High (3 points)
SSG output: –121dBm
(0.2µV)
SSG DEV: 3.0kHz
MCP-
5T Write
[Narrow] 2) Tuning point: Low, Center,
High (3 points)
SSG output: –121dBm
(0.2µV)
SSG DEV: 1.5kHz
4. S Meter 1
Write
(RSSI)
1) Tuning point: Center
(1 points)
SSG output: –120dBm
(0.22µV)
SSG DEV: 3.0kHz
MCP-
5T Write S Meter Icon (2 dots)
S Meter
FULL Write
(RSSI) 2) Tuning point: Center
(1 points)
SSG output: –105dBm
(1.26µV)
SSG DEV: 3.0kHz
Write S Meter Icon (9 dots)
• The Squelch Level 1 setting uses the Squelch Level 2 calculated adjustment level value.