Kenwood TK-3148, Service Manual

Page: 46 / 74

TK-3148
46
ADJUSTMENT
Receiver Section (Panel tuning mode except when Panel test mode is specifi ed)
Item Condition
Measurement Adjustment
Specifi cations / Remarks
Test-
equipment
Unit Terminal Unit Parts Method
1. Sensitivity
Adjust
(BPF
charac-
teristic)
1) Adj item [SENS]
Adjust
[***]
2) Low-edge frequency
Adj
item
[L SENS] → [L2 SENS] →
[C SENS] → [H2 SENS] →
[H SENS]
Spe-Ana setting
Center f: 370MHz
Span: 100MHz
RBW: 100kHz
VBW: 1kHz
REF level: –40dBm
ATT: 0dB
Tra-G
setting
Input level: –40dBm
Tracking
generator
Specturm
analyzer Panel
TX-RX
ANT
BPF
Need
couple
capacitor
(1000PF)
Panel Encoder
knob Adjustment
fo=fL, fL2, fC, fH2,
fH Adjust point
frequency.
Refer to the Panel
tuning mode fre-
quency table on
page 39.
2. Sensitivity
Check [Panel Test Mode]
1) CH-Sig: 1-1
SSG
output
Wide: –117dBm (0.28µV)
(MOD: 1kHz/±3kHz)
Narrow: –116dBm (0.316µV)
(MOD: 1kHz/±1.5kHz)
SSG
AF VTVM
Oscilloscope Panel ANT
Universal
connector Check 12dB SINAD or more
3. Squelch
(Preset)
Adjust
[Narrow] 1) Adj item [SQL]
Adjust
[***]
SSG output
: 12dB SINAD level
2) Adj item
[L SQL]
→ [C SQL] → [H SQL]
Adjust [***]
Panel Encoder
knob
Squelch Adjust to point of
opening
[Wide] 3) Adj item [w SQL]
Adjust
[***]
SSG output
: 12dB SINAD level
4) Adj item
[wL
SQL] → [wC SQL] →
[wH SQL]
Adjust [***]
L
C
L2
H2
H
Band Pass Filter Characteristic (C)