Kenwood TK-890/(B) Service Manual page 71

TK-890/ (
Common Section
Item Condition
1. Frequency • Frequency range (MHz)
list K : 450~490 (TK-890/(B), 890H(B))
K2 : 480~512 (TK-890(B))
K3 : 403~430 (TK-890(B))
• Adjustment frequency (MHz)
CH TX
1 470.000 460.100 496.000 490.100 416.500 420.100
2 450.000 450.100 480.000 480.100 403.000 410.100
3 490.000 469.900 512.000 499.900 430.000 429.900
4 460.000 460.000 490.000 490.000 420.000 420.000
5 460.200 460.200 490.200 490.200 420.200 420.200
6 460.400 460.400 490.400 490.400 420.400 420.400
7 470.000 470.100 492.000 492.100 403.000 403.100
8 480.000 480.100 502.000 502.100 413.000 413.100
9 490.000 489.900 512.000 511.900 423.000 422.900
10
11
2. Setting • Receiver section
The indicated SSG output level are for maximum output.
Whenever there is no modulation desingnation,
standard modulation (MOD : 1kHz, DEV : 3kHz (Wide),
DEV : 1.5kHz (Narrow)) is indicated.
Connect the front panel (KCH-10) to the transceiver's body .
3. PLL lock 1) CH-SIG : 3-1
voltage CH-SIG : 10-1 K2,K3
2) CH-SIG : 9-1
CH-SIG : 11-1 K3
3) CH-SIG : 3-1
CH-SIG : 11-1 K3
PTT : ON
4) CH-SIG : 2-1
CH-SIG : 11-1 K2
CH-SIG : 7-1
5) CH-SIG : 7-1 K
CH-SIG : 1-1 K2,K3
6) CH-SIG : 2-1
CH-SIG : 11-1 K2
PTT : ON
70
B ) /H ( B )
ADJUSTMENT
Measurement
Test-
equipment
K K2
RX TX RX
490.000 489.900 420.000 419.900
470.000 470.100 440.000 439.900
SSG 4Ω dummy load
ANT
AF VTVM
Oscilloscope
Distortion meter
ACC
(SP)
K DC VM TX-RX CV
Power meter (A/3)
K,K2
K,K2
K
K3
K,K3
Adjustment
Unit Terminal Unit Parts
• Signalling
K3 CH No.
TX RX 1
2
3
4
5
6
7
8
9
• Transmitter section
AG
AF VTVM
MIC
PTT
TX-RX A (TC302) 1.5V
(A/3)
B (TC303)
C (TC301)
Specifications/Remarks
Method
Encode tone Decode tone
None
100Hz square wave
QT 67.0Hz
QT 151.4Hz QT 151.4Hz
QT 250.3Hz QT 250.3Hz
DQT 023N
Single tone 1633Hz 2 tone 321.7/928.1Hz
DTMF [9] DTMF [159]
MSK
Power meter
Coupler
ANT
DC IN
± 0.1V
Check 8.0V or less
None
None
QT 67.0Hz
DQT 023N
None
Deviation
meter
Frequency
counter
Power Ammeter
supply
– +
– +
+
–