Kenwood TK-890/(B) Service Manual page 73

TK-890/ ( B
Item Condition
6. MCF 1) CH-SIG : 1-1
• Wide Spectrum analyzer
Span : 25kHz
Scale : 2dB div
Center frequency : 73.050MHz generator
Tracking generator
Output : –20dBm
• Narrow 1) Up/down knob : Set the narrow
"n_ _" appear on the LCD
7. Distortion 1) CH-SIG : 1-1 (Wide)
SSG output : –53dBm/501µV
AF output : 2V/4Ω
8. RF power 1) Select _ _L
• High power _POW_XXX
model in tune mode
(High power) PTT : ON
2) Select _ _H
_POW_XXX
in tune mode
PTT : ON
(Low power) 1) CH-SIG : 1-1
Select LPOW_XXX
in tune mode
PTT : ON
• Med power 1) CH-SIG : 1-1
model Select _POW_XXX
(High power) in tune mode
PTT : ON
(Low power) 1) CH-SIG : 1-1
Select LPOW_XXX
in tune mode
PTT : ON
72
) /H ( B )
ADJUSTMENT
Measurement
Test-
Unit
equipment
Spectrum TX-RX CN103
analyzer (A/3)
Tracking
SSG Rear
Distortion
meter
AF VTVM
Oscilloscope
4Ω dummy
load
Power meter Rear
Ammeter
Adjustment
Terminal Unit Parts
TX-RX L112 Adjust it to make gain maximum, and make the
(A/3) L113 band flat as shown in the below.
L115
CN102
MARKER
6.00kHz
–0.68dB
RBW
300Hz
VBW
300Hz
DL
–22.02dBm
SWP
1.3
L111
L114
L116
MARKER
3.00kHz
–0.16dB
RBW
300Hz
VBW
300Hz
DL
–22.02dBm
SWP
1.0
ANT Check
EXT.SP
ANT Final VR1 Maximum clockwise 105W or more
100W adj.
Panel PF3 key 100W Check
PF4 key
75W adj.
40W adj.
TX-RX VR1 Maximum clockwise 42W or less
(C/3)
40W adj.
Panel PF3 key 40W check
PF4 key
5W adj.
Specifications/Remarks
Method
REF –20.0dBm ATT 10dB
2dB/
1.5dB max.
–6kHz +6kHz
–10kHz +10kHz
s
SPAN 25.0kHz CENTER 73.0500MHz
REF –20.0dBm ATT 10dB
2dB/
1.5dB max.
–3kHz
+3kHz
–7kHz +7kHz
s
SPAN 20.0kHz CENTER 73.0500MHz
3% or less
If the distortion value
exceeds 3%, you must
adjust L120 to obtain a
minimum distortion value.
100W±5W, 28A or less
100W ± 5W
75W±1W
28A or less
40W±1W
40W±1W, 12A or less
40W±1W
5W±1W
3dB or more
(±10kHz)
3dB or more
(±7kHz)