TK-3178
(
L
)
52
ADJUSTMENT
Receiver Section
Item
Condition
Measurement
Adjustment
Specifi cations / Remarks
Test-
equipment
Unit
Terminal
Unit
Parts
Method
1. Sensitivity
adjust
1) Adj item: [SENS]
Adjust:
[
✳✳✳
]
2) Adj item: [L SENS]
→
[L’ SENS]
→
[C SENS]
→
[H’ SENS]
→
[H SENS]
Adjust:
[
✳✳✳
]
SSG
output
: –70dBm (70.8µV)
(MOD: 1kHz/±1.5kHz)
SSG
AF VTVM
Oscilloscope
Panel
ANT
SP/MIC
Panel
Selector
knob
Adjust for RSSI MAX Rotate the selector knob and
increase the adjustment value
starting from “1” to obtain
RSSI MAX.
2. Sensitivity
check
[Panel test mode]
1) CH-Sig: 1-1
SSG
output
Wide: –117dBm (0.32µV)
(MOD: 1kHz/±3kHz)
Narrow: –116dBm (0.35µV)
(MOD: 1kHz/±1.5kHz)
Check
13dB SINAD or more
3. Squelch
Open adjust
•
Narrow
1) Adj item: [n SQL]
Adjust:
[
✳✳✳
]
SSG
output
: –119dBm (0.25µV)
(MOD: 1kHz/±1.5kHz)
Panel
Selector
knob
After input signal
from SSG, press [B]
key. That numeric
will be stored in
memory.
After adjusting SQL, check
SQL open/close.
SSG –117dBm (0.32µV): Open
SSG OFF: Close
• Wide
2) Adj item: [w SQL]
Adjust:
[
✳✳✳
]
SSG
output
: –119dBm (0.25µV)
(MOD: 1kHz/±3.0kHz)
4. Low RSSI
adjust
•
Narrow
1) Adj item: [n LRSSI]
Adjust:
[
✳✳✳
]
SSG
output
: –118dBm (0.28µV)
(MOD: 1kHz/±1.5kHz)
After input signal
from SSG, press [B]
key. That numeric
will be stored in
memory.
2) Adj item: [nL LRSSI]
→
[nC LRSSI]
→
[nH LRSSI]
Adjust:
[
✳✳✳
]
5. Squelch
Tight adjust
•
Narrow
1) Adj item: [n SQLT]
Adjust:
[
✳✳✳
]
SSG
output
: –114dBm (0.45µV)
(MOD: 1kHz/±1.5kHz)
After input signal
from SSG, press [B]
key. That numeric
will be stored in
memory.
After adjusting SQL, check
SQL open/close.
SSG –112dBm (0.56µV): Open
SSG OFF: Close
• Wide
2) Adj item: [w SQLT]
Adjust:
[
✳✳✳
]
SSG
output
: –115dBm (0.4µV)
(MOD: 1kHz/±3.0kHz)
6. High RSSI
adjust
•
Narrow
1) Adj item: [n HRSSI]
Adjust:
[
✳✳✳
]
SSG
output
: –70dBm (70.8µV)
(MOD: 1kHz/±1.5kHz)
After input signal
from SSG, press [B]
key. That numeric
will be stored in
memory.
2) Adj item: [nL HRSSI]
→
[nC HRSSI]
→
[nH HRSSI]
Adjust:
[
✳✳✳
]
