Furuno FS-1575 Service Manual page 449

Reference) Example of Reception Characteristics
The following table shows an example of measurement of received signal (of F + 1 kHz)
whose SINAD comes to 20dB.
MODE
S-DUP(dBuV)
DUP(dBuV)
60dB
50
SSB NR1
40
30 SSB
SSB RF ATT ON
20
AM 30% MOD
10
-10
0 10 20 30 40
SSG Level
Fig. 7.3.9 SINAD Characteristics
4.0V
3.0
2.0
SSB
1.0
SSB RF ATT ON
-10
0 10 20 30 40
SSG Level
Fig. 7.3.11 AF OUTPUT Characteristics
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Table 7.3.6 Example of SSB SINAD Measurement
2M 4M 6M
0.5 0 0
- 6 7
8M SINAD
50 60 70 80 90 100 110
SSB 8MHz
SSB NR1
AM 30% MOD
50 60 70 80 90 100
8M 12M 16M
-0.5 -0.5 0
5.5 6.5 7.5
6.0V
-50dB
5.0
-40
4.0
DISTORTION
-30
3.0
-20
2.0
-10
1.0
dBuV
-10
0 5 10
Fig. 7.3.10 RF GAIN VR vs. AF OUTPUT Characteristics
30
20
10
-10 0 10 20
dBuV
110
Fig. 7.3.12 S Meter Characteristics
7-49
7.3 Receiver Circuit
18M 22M 25M
0 0.5 1
8.5 7.5 7
8M RF GAIN VR
AF VR MAX.
Input: 60dBuV
SSB
AM 30% MOD
15 20 25 30 35 40
RF GAIN VR
SSB 8MHz
30 40 50 60 70 80
SSG Level
dBuV
90 100 110