TK-3140
32
ADJUSTMENT
Receiver Section
Item
Condition
Measurement
Adjustment
Specifications/
Test equipment
Unit
Terminal
Unit
Parts
Method
Remark
Band Pass Filter Characteristic (K)
1. Sensitivity
1) Adj item [SENS]
Tracking
Panel
ANT
Panel
Encoder
Adjust
Adjust [
∗∗∗
]
generator
knob
(BPF
characteristic) 2) Low-edge frequency
Specturm
TX-RX
BPF
Adj item
analyzer
Need couple
[L SENS]
➝
[L2 SENS]
➝
capacitor
[C SENS]
➝
[H2 SENS]
➝
(1000PF)
[H SENS]
Spe-Ana setting
Center·f : 450MHz(K)
Span
: 100MHz
RBW
: 100kHz
VBW
: 1kHz
REF level : -50dBm
ATT
: 0dB
Tra-G setting
Input level:-30dBm
2. Sensitivity
[Panel Test Mode]
SSG
Panel
ANT
Check
1) CH-Sig:1-1
AF VTVM
Universal
Check
12dB SINAD or
SSG OUT
Oscilloscope
connector
more
Wide:-117dBm
(MOD:1kHz /
±
3kHz)
Narrow:-116dBm
(MOD:1kHz /
±
1.5kHz)
3. Squelch
1) Adj item [O SQL]
Encoder
Adjust to point
Adjust
Adjust [
∗∗∗
]
knob
of opening
(Open)
2) Adj item
squelch.
[L OSQL]
➞
[C OSQL]
➞
[H OSQL]
Adjust [
∗∗∗
]
SSG OUT:
12dB SINAD level
3) Adj item [n OSQL]
Adjust [
∗∗∗
]
SSG OUT:
12dB SINAD level
4. Squelch
[Panel Test Mode]
Check
Squelch must
Check
1) CH-Sig:1-1
be opened.
(Open)
SSG OUT:
12dB SINAD level
2) SSG OUT:OFF
Squelch must
be closed.
Adjustment
Turn a knob and make “fo”
level 1dB above from peak
level.
Caution
Adjustment “SENS” value
≥
60
fo=f L, f L2, f C, f H2, f H
Adjust point frequency
Refer to the Panel Tuning
Mode frequency table on
page 28.
440MHz
1dB
fo
450MHz
460MHz
470MHz
480MHz
490MHz