Kenwood TK-3148 Service Manual page 46

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