Re: Confused about how AGC works?
A poorly designed AGC circuit could oscillate exactly as you describe.toggle quoted messageShow quoted text
Whether or not it will oscillate depends on the delays through each element
and the gain of each element. Both can vary depending on the frequency
at which they are calculated.
On Thu, Apr 18, 2019 at 06:00 PM, digger AB3XU wrote:
To begin with I can follow along with the theory and it does makes sense. Very simply, the signal from Vol-Hi via Q1 is used to control the conduction of Q2 and how much Q3 shunts the IF signal. Ideally RF levels below S9 are left relatively untouched, however if greater than that, the action of Q2 conducting less and Q3 acting as a shunt results in reducing clamping (reducing) the IF level.