Furuno FM-8800D - Page 195

8.3 T/A, TEST, RESET DSP
8-15
NOTE:
Below chart shows the changing levels of FM-8800D RX IF LEVEL and AF NOISE.
Especially, IF LEVEL changes due to unsteadiness of RX gain. Also, antenna being
connected and not connected contributes to this change according to noise in the air as
well.
Fig. 8.3.1 FM-8800D, Change of RX IF LEVEL and AF NOISE
0
-130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10
1000
2000
3000
4000
5000
CH18: AF Noise
CH16: AF Noise
CH18: IF Level
CH16: IF Level
SSG Level
Level
0 +10 dBm
6000
7000
8000
9000
10000
11000
12000
13000
14000
15000
16000
17000
18000
19000
20000
21000
22000
23000
24000
-113dBm = 0dBu
Reference only