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Re: AGC Signal changes dramatically between channels
AGC stands for automatic gain control. In an application such as a STB it would typically be there to control the gain on the front-end RF amp which is fed directly from the cable feed to your STB. The reason that the that it is different dependant on what channel your watching is that one TV program' carrier signal may be one strength whilst another program may have a carrier at a different level. The AGC works to even out these differences so that the signal the decoder/demodulator sees the same signal strength no matter what the STB is tuned to.
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