47
ADJUSTMENT
Measurement
Test-
equipment
Unit
Terminal
Adjustment
Unit
Parts
Method
Specifications/Remarks
Condition
Item
TK-980/981
Receiver Section
1. Discriminator 1) Set test mode
SSG
Rear
ANT
TX-RX
L6
AF output maximum.
CH : CH4 - Sig1
panel
(A/2)
SSG output : –53dBm
AF VTVM
ACC
AF : 1.4V/4
Ω
Oscilloscope
(EXT.SP)
2. Sensitivity
1) Set test mode
SSG
ANT
Check
12dB SINAD or more.
check
CH : CH1 - Sig 1
.
SSG output : –116dBm
AF VTVM
ACC
SSG MOD : 3kHz
Distortion
(EXT.SP)
AF output : 1V/4
Ω
meter
Oscilloscope
3. Squelch
1) Set test mode
AG
Squelch closed
CH : CH4 - Sig 1
once.
Select “SQL” in tuning mode.
Then squelch must
SSG freq’
be opened.
: 860.5MHz (TK-980)
: 938.025MHz (TK-981)
SSG output : Value when 2dB
is subtracted from the
sensitivity value of 12dB
SINAD.
SSG MOD : 3kHz (TK-980)
1.5kHz (TK-981)
4. Squelch
1) Set test mode
Check
Squelch must be opened.
check
CH : CH4 - Sig1
SSG output : 12dB SINAD level
2) SSG output : OFF
Squelch must be closed.
5. QT check
1) Set test mode
CH : CH4 - Sig5
SSG MOD
INT : 1kHz
EXT : 151.4Hz
SSG system MOD DEV
:
±
3.75kHz (TK-980)
:
±
1.85kHz (TK-981)
SSG output : 10dB SINAD level
2) CH : CH1 - Sig4
Check
Squelch must be closed.
CH1 - Sig6
CH1 - Sig7
Measurement
Test-
equipment
Unit
Terminal
Adjustment
Unit
Parts
Method
Specifications/Remarks
Condition
Item
1. Frequency
1) Set test mode
Power meter Rear
ANT
Check
806.050MHz
±
100Hz (TK-980)
Select “FREQ” in tuning mode. F. counter panel
896.025MHz
±
100Hz (TK-981)
PTT : ON
2. Maximum
1) Set test mode
Check
16.0W or more.
power check
Select “H POW” in tuning mode.
.
“POW 256”
PTT : ON
Transmitter Section