Reception Specifications - Furuno FS-1575 Service Manual

5.8.3 Reception Specifications

Regardless of whether or not passing signal through the DIVIDER circuit on the RX
FIL board, the reception specifications are about the same.
Item Input Port
T/R ANT
J3E
Reception
R.ANT
Gain
R.ANT DUP
T/R ANT
J3E
20dB
R.ANT
SINAD
R.ANT DUP
T/R ANT
J3E
AGC
Operating
R.ANT
Point
R.ANT DUP
CONFIDENTIAL (internal use only)
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It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.
Table 5.8.1 Reception Specification with DIVIDER set to "OFF"
Standard Condition
AF Output (4 ohm load): Find SSG level at
5dBuV or less
which output power comes to 1 watt.
5dBuV or less
13dBuV or less
Make adjustment of AF gain VR to set AF
7dBuV or less
output power (with 4 ohm load applied) to 0.5
watts, and then make measurement of 20dB
7dBuV or less
SINAD or 20dB S/N.
15dBuV or less
Find SSG level at which the pointer of
7dBuV
S-meter starts swinging.
7dBuV
15dBuV
5-58
• Frequency (F): 4.1MHz
• AF, RF Gain VR Max. • AGC ON (FAST)
• SSG output: F+1kHz
• Frequency: 4.1MHz
• AGC ON (FAST) • SSG output: F+1kHz
• Frequency: 4.1MHz
• AF Gain VR ADJ. • AGC ON（FAST）
• SSG output: F+1kHz
5.8 Reception Testing
• RF Gain VR Max.
• RF Gain VR Max.