It is true that an analog S meter in a traditional rig with analog AGC
is really indicating the AGC voltage. Does the AGC voltage follow signal
strength in a direct signal voltage to AGC voltage 1:1 linear relation?
Maybe over part of the S meter AGC voltage range, and maybe not. I
doesn't matter because the scale on the S meter is designed to make the
S units and dB over S9 indicated a good representation of the input
signal strength, even if the AGC voltage does not have a direct 1:1
linear relation to the input signal voltage.
S meters are not laboratory grade signal strength measuring instruments,
although some are pretty good, especially around center scale or around
S9. Most are worse at the low and high ends of their scales.
DE N6KB
Mike, the 6dB of difference in S meters is VOLTAGE difference measured in
the AGC.
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