Kenwood TKR-750 Service Manual page 42

TKR-750
Item Condition
21. RA outut 1) Connect SSG to RX ANT.
level CH : 2 (Wide)
(Wide) SSG output : –53dBm/501µV
SSG MOD : 1kHz
SSG DEV : 3.0kHz
(Narrow) 2) CH : 2 (Narrow)
SSG output : –53dBm/501µV
SSG MOD : 1kHz
SSG DEV : 1.5kHz
22. Maximum 1) Connect AG to the MIC terminal. MOD ANA Rear
deviation A-low CH (TX VCO A low)
(Wide) A-center CH (VCO A center)
A-high CH (TX VCO A high)
B-low CH (TX VCO B low)
B-center CH (VCO B center)
B-high CH (TX VCO B high)
Deviation meter filter
HPF : OFF
LPF : 15kHz
De-emphasis : OFF
AG : 1kHz/50mV (Terminal load)
Transmission
(Narrow) 2) A-low CH (TX VCO A low)
A-center CH (VCO A center)
A-high CH (TX VCO A high)
B-low CH (TX VCO B low)
B-center CH (VCO B center)
B-high CH (TX VCO B high)
Transmission
Note : After adjustment of the "Max. Deviation", be sure to check the "DQT balance".
23. DQT 1) Low CH (VCO-A center)
balance High CH (VCO-B center)
(Wide) Deviation meter filter
HPF : OFF
LPF : 3kHz
De-emphasis : OFF
Transmission
(Narrow) 2) Low CH (VCO-A center)
High CH (VCO-B center)
Transmission
24. QT 1) VCO-A CH (TX VCO A center)
deviation VCO-B CH (TX VCO B center)
(Wide) Deviation meter filter
HPF : OFF
LPF : 3kHz
De-emphasis : OFF
Detector : p-p/2
Transmission
(Narrow) 2) VCO-A CH (TX VCO A center)
VCO-B CH (TX VCO B center)
Transmission
42
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
SSG Rear RX ANT
DVM CONTROL
I/O jack
RA (pin 11)
4.7kΩ load
TX OUT
or
Deviation
meter
Oscilloscope
AG Front MIC
AF VTVM
MOD ANA Rear TX OUT
or
Deviation
meter
Oscilloscope
TX ANT
Adjustment
Parts Method
± 20mV
PC adj.
400mV
± 0.1kHz
PC adj.
4.1kHz
± 0.1kHz
PC adj.
2.05kHz
PC adj. Oscilloscope DC range
Make the de- flat "A" part
modulated waves
into square waves.
± 0.05kHz
PC adj.
0.75kHz
± 0.05kHz
PC adj.
0.35kHz
Specifications/Remarks
A
A