Icom IC-7300 Manual page 11

Its Mostly About The Receiver
Dynamic Range – Its About Optimal Gain Control
RF (Pre)
Bandpass
Amplifier
Filter
• Goal is to add enough gain to amplify the desired signal for
maximum converter resolution
• Hard when, signals are very weak and close to the noise floor
• Receiver controls to use:
• Preamplifier/Attenuator – base setting to get in the "ball park"
• AGC Time Constant – set to match characteristics of the desired signal
• RF Gain Control – manual adjustment to fine-tune AGC operation
• IP+ and similar controls – proprietary "magic" to optimize AGC Loop to
reject de-sensitation effects due to adjacent signal interference
Digital
Osc.
Digital
A/D Proc.
(FPGA)
AGC Loop, IP+
D/A
11..1
+
00..0
11