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Date Posted: 16:15:44 01/16/02 Wed
Author: Tom
Subject: Re: AGC Hack Question to Potter or those who knows
In reply to: Ronald 's message, "AGC Hack Question to Potter or those who knows" on 10:50:20 01/16/02 Wed

The AGC voltage normally varies with the signal strength of the recieved signal. This signal strength usually does not vary for individual channels. It obviously can change quite a bit between channels. Since the signal strength for any individual channel doesn't vary, the AGC voltage for that channel does not vary and a steady adjustable voltage applied to the AGC filter pin should work. The problem with using a pot is that it does not apply a low impedance source. The resistance of the pot means that the AGC voltage can still vary slightly from the set position. The AGC sample and hold circuit uses an op amp to apply the voltage so that it can't vary. Software control reads the AGC voltage and applies it steadily instead of allowing it to vary as it does with a scrambled channel.

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