Kenwood TK-890/(B) Service Manual page 72

Item Condition
4. Transmit 1) CH-SIG : 1-1
frequency Select FREQ_XXX
in tune mode
PTT : ON
5. BPF BPF (L101, L104) bandwidth is 20MHz. The BPF bandwidth can be revised to the following depending on your operating frequency.
• TK-890/(B) K type
BPF bandwidth 450~470MHz (Default) ← → 470~490MHz (Revised)
Channel allocation and frequency of test mode
Low
Center
High
• TK-890(B) K2 type
BPF bandwidth 480~500MHz (Default) ← → 492~512MHz (Revised)
Channel allocation and frequency of test mode
Low
Center
High
• TK-890(B) K3 type
BPF bandwidth 410~430MHz (Default) ← → 403~423MHz (Revised)
Channel allocation and frequency of test mode
Low
Center
High
• TK-890H(B) K type
BPF bandwidth 450~470MHz (Default) ← → 460~480MHz (Revised)
Channel allocation and frequency of test mode
Low
Center
High
1) CH-SIG : Center - 1
Spectrum analyzer
Span : 50MHz
Scale : 5dB div
Tracking generator
Output : –20dBm
Note : When revising the BPF bandwidth from the default settings, ensure
the sensitivity and the point of closing and opening the squelch in
accordance with adjusting procedures 16, 17 and 18.
ADJUSTMENT
Measurement
Test-
Unit
equipment
Power meter Rear
f. counter
Default
CH-SIG 2-1 : 450.1MHz CH-SIG 7-1 : 470.1MHz
CH-SIG 1-1 : 460.1MHz CH-SIG 8-1 : 480.1MHz
CH-SIG 3-1 : 469.9MHz CH-SIG 9-1 : 489.1MHz
Default
CH-SIG 2-1 : 480.1MHz CH-SIG 7-1 : 492.1MHz
CH-SIG 1-1 : 490.1MHz CH-SIG 8-1 : 502.1MHz
CH-SIG 3-1 : 499.9MHz CH-SIG 9-1 : 511.9MHz
Default
CH-SIG 2-1 : 410.1MHz CH-SIG 7-1 : 403.1MHz
CH-SIG 1-1 : 420.1MHz CH-SIG 8-1 : 413.1MHz
CH-SIG 3-1 : 429.9MHz CH-SIG 9-1 : 422.9MHz
Default
CH-SIG 2-1 : 450.1MHz CH-SIG 7-1 : 460.1MHz
CH-SIG 1-1 : 460.1MHz CH-SIG 8-1 : 469.1MHz
CH-SIG 3-1 : 469.9MHz CH-SIG 9-1 : 479.1MHz
Spectrum TX-RX CN101
analyzer (A/3)
Tracking Rear
generator
TK-890/
Adjustment
Terminal Unit Parts
ANT Panel PF3 key CH-1 frequency
PF4 key
Revised
Revised
Revised
Revised
TX-RX L101 Adjust waveform
(A/3) L104 to figure at below.
ANT
MARKER
RBW
VBW
DL
SWP
( B ) /H
Specifications/Remarks
Method
± 70Hz
REF –10.0dBm ATT 10dB
2dB/
2.0dB max.
10.00MHz
–0.94dB
–10MHz +10MHz
300kHz
100kHz
–12.02dBm
s
50m
SPAN 50.0MHz CENTER 460.0MHz (K)
490.0MHz (K2)
420.0MHz (K3)
( B )
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