A binaural receiving aid was patented (USPTO #4,434,508 ) in the 80's by
American Systems Corporation. The author/patent holder (then N4UU-not the
current holder of that call) published a QST article (Feb 1986) using
HP/LPfilters and a stereo amp in the audio chain.
The Elecraft K3/K3S accomplishes the same with DSP when the AFX mode is
engaged. However if using the sub-receiver/diversity capability, the AFX mode
is somewhat redundant.
The March 1999 QST article by KK7B accomplishes the binaural capability at RF
using direct conversion RX architecture.
About $10 worth of parts and a couple of hours time by can add audio channel
binaural capability to any RX, but IMHO, not comparable to true
dual-receiver/antenna diversity processing where the processing is done @ RF
and provides greater possibilities of desired/undesired signal diversity
(K3/K3S/Orion).
Dave, K1FKFort Kent, ME
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