Engineering trade offs are so interesting.
Unfortunately the K3 notch works outside of the AGC loop. However everything
else about the K3 sounds brilliant and natural using Lyle's IF DSP in all modes.
The FT2000 has it's manual NOTCH inside the AGC loop, kudos on that, but the IF
DSP receiver does not sound quiet and natural on CW, like K3 does, if there is
any noise on the band at all.
What was Yaesu's solution? They assigned the sub receiver to be analog, so you
have a hybrid, which "solves" the problem.
However - switching from the digital side to the analog side really contrasts
just what a noisy receiver you have on the IF DSP side when there is any band
noise. Why doesn't K3 have this problem? I don't know.
It seems silly that K3 can get the DSP proper for all modes, and Yaesu has you
flipping from one side to the other - but the FT2000 has an ergonomics package
that really rocks. It adds to operating fun if you have nothing on the line
(like contest operation).
======================================
[Elecraft] K3 Notch
Joe Subich, W4TV lists at subich.com
Mon Apr 26 21:15:41 EDT 2010
> I wonder how the other radios like an IC-7600 can get away with
> putting it within the agc loop.
Perhaps they're using a fixed level of hardware AGC ahead of the
ADC or intentionally holding the level to the ADC well below
saturation (forfeiting dynamic range) to prevent a strong
interfering signal from clipping.
73,
... Joe, W4TV
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