[Elecraft] K3 on-channel strong signal overload?

[orbarrett]

Hello all,

I just finished operating my K3 from my friend's driveway using a portable
dipole on 60M, and wanted to inquire about some incoming signal overload
that cropped up.  I was joined while ragchewing with some friends on 5371.5
by two other friends locally, one operating HF mobile from the same driveway
and another operating from a base rig in the shack (using a backyard dipole
antenna).  When either of these two friends transmitted on the same channel
(at 100W), I observed severe signal breakup in the K3 receive audio.

To investigate further, I switched the portable antenna from the K3 to my
friend's FT-817 on the same operating table, and no audio breakup was
observed under the same conditions.  Returning the antenna to the K3, I then
got rid of most of the signal breakup by turning on the input attenuator and
turning down the RF gain to near minimum.

Is it possible that the extremely strong on-channel signal in this case is
exceeding the ability of the K3's hardware AGC to protect the A/D converter
input?  Thanks for any suggestions on this, including anything I may have
overlooked.  AGC was enabled and both the NB and NR were switched off.

I should mention that these conditions of operating portable (with several
hams close-in on the same channel) are very demanding, but happen
occasionally in certain situations such as for HF Pack operating.
I'm also using the rig in HF mobile service, and enjoy it very much.

I appreciate any help in advance,
Oliver Barrett  KB6BA
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