Kenwood TK-790 Service Manual page 70

TK-790/ ( B
Item Condition
5. BPF 1) CH-SIG : 2-1
Spectrum analyzer
Span : 50MHz
Scale : 5dB div
Tracking generator
Output : –20dBm
6. MCF 1) CH-SIG : 1-1
• Wide Spectrum analyzer
Span : 25kHz
Scale : 2dB div
Center frequency : 44.850MHz 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) CH-SIG : 1-1
• High power Select _POW_XXX
model in tune mode
(High power) PTT : ON
(Low power) 1) CH-SIG : 1-1
Select LPOW_XXX
in tune mode
PTT : ON
70
) /H ( B )
ADJUSTMENT
Measurement
Test-
Unit
equipment
Spectrum TX-RX CN101
analyzer (A/3)
Tracking Rear
generator
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 the coils in
(A/3) L111 the following order
L110 : L112, L111, L110
ANT
MARKER
22.00MHz
–18.70dB
RBW
300kHz
VBW
100kHz
DL
–1.05dBm
SWP
50m
TX-RX L118 Adjust it to make gain maximum, and make the
(A/3) L119 band flat as shown in the below.
L122
CN102
MARKER
4.50kHz
–0.28dB
RBW
300Hz
VBW
300Hz
DL
–22.02dBm
SWP
1.3
L117
L120
L123
MARKER
3.00kHz
–0.42dB
RBW
300Hz
VBW
300Hz
DL
–22.02dBm
SWP
1.0
ANT Check
EXT.SP
ANT Final VR1 Maximum clockwise 115W or more
110W adj.
Panel PF3 key Check
PF4 key
45W adj.
Specifications/Remarks
Method
REF 4.0dBm ATT 10dB
5dB/
5dB
10dB
or more –5 +5
MHz MHz
–22MHz +22MHz
s
SPAN 50.0MHz CENTER 148.0MHz (K)
136.0MHz (K2)
REF –20.0dBm ATT 10dB
2dB/
1.5dB max.
–4.5kHz +4.5kHz
–10kHz +10kHz
s
SPAN 25.0kHz CENTER 44.8500MHz
REF –20.0dBm ATT 10dB
2dB/
1.5dB max.
–3kHz +3kHz
–7kHz
+7kHz
s
SPAN 20.0kHz CENTER 44.8500MHz
3% or less
If the distortion value
exceeds 3%, you must
adjust L127 to obtain a
minimum distortion value.
110W±5W, 25A or less
110W ± 5W
45W±1W
10dB
or more
3dB or more
(±10kHz)
3dB or more
(±7kHz)