Furuno FS-1503 - Page 82

5-13
Table 5-2 Adjustment (2/2)
Board Item Setting Adjuster Check Point Level Remarks
OSC Circuit
54 MHz ±
1 Hz
Ref. OSC,
Frequency
30 minutes after
power-on
C554
TP3 (H) -
TP4 (C)
1.1 Vp-p to
1.5 Vp-p
2Lo output
(54 MHz)
3rd Local
OSC.
MODE: J3E -
TP7 (H) -
TP6 (C)
more than
1.0 Vp-p
456.5 kHz
1st Local
OSC.
MODE: TLX -
TP1 (H) -
TP2 (C)
0.8 Vp-p to
1.2 Vp-p
Fo +
54.455 kHz
RX circuit
S-meter RX SIG: 4 MHz/J3E R210 S meter
+10 dB
µ
V
SSG Level
S/N Ratio
RX SIG: 4 MHz/J3E
RF GAIN
MAX/AGC ON
--
+2 dB
µ
V ??
SSG Level
(S/N = 20 dB)
Total Gain
RX SIG: 4 MHz/J3E
FR/AF GAIN
MAX/AGC ON
--
+1 to
-5 dB
µ
V
SSG Level
(AF output of
1 W)
NB
Function
External pulse noise
mixed
CR11/12 (A) -
GND
Negative
pulse
LINE OUT
Level
RX SIG: 4 MHz/TLX
RF GAIN MAX/
AGC ON
REMOTE
Connector
10 (H) -11 (C)
+3 to +9 dBm
600
Ω
Load
TX Circuit
MIC GAIN
MIC IN: 600
Ω
/
-40 dBm/1500 Hz
-
TP8 (H) -
TP9 (C)
1.6
±
0.2 Vp-p
MIC IN: 600
Ω
/
-40 dBm/1500 Hz
R156
TP5 (H)-
TP6 (C)
0.4 Vp-p
TX GAIN
Adjustment
MIC IN: 600
Ω
/
-54 dBm/1500 Hz
4 MHz/J3E/P.Data:
220
R156
Output from
main unit
40 W
Output
Level
2-TONE ALM:
[ALM] + [ENT]
4 MHz/J3E/P.Data:
220
-
J2
(EXC OUT)
about 20 Vp-p
OUT 50
Ω
Load
H3E MOD
Adjustment
MIC IN: -40 dBm/
600
Ω
/1500 Hz
2182 kHz/
H3E/P.Data: 200
R101
Output from
main unit
100 % MOD
TX/RX
(05P0666)
LINE IN
Level
LINE IN: 0 dBm/
1700 Hz
4 MHz/ TLX/
P.Data: 220
-
J2
(EXC OUT)
about 20 Vp-p
OUT 50
Ω
Load