Furuno FS-1570 Service Manual page 148

The receiver sensitivity from RX IN connector on TX/RX board to AF output terminal
on the control unit is;
1) SINAD 20dB
J3E: +3 dBuV
H3E: +18 dBuV
2) AF output(SP) 4W
-0+3dBuV
3) Minimum AGC level (Minimum AGC operating level is the same level as that S
meter starts defecting.)
+12 dBuV
Reference)
AGC attack-time: 8.6 msec
AGC decay-time: 1080 msec
5-31
5.4 TX/RX Board (05P0733)