On 12/31/2016 11:22 PM, Jim Brown wrote:
Audio processing can create distortion only in the passband of the
crystal filters.
Not in the case of Yaesu and Icom (at least). Both use ALC circuits
with excess gain which activate after the PA is driven into saturation.
The excess gain also drives the IF and driver stages into saturation.
Since the "roofing filter" (on rigs like the FT-1000 or IC-756 series)
is a relatively broad VHF filter, that distortion, clipping and splatter
is not limited to the audio bandwidth and easily extends to
25 KHz or more.
73,
... Joe, W4TV
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