[Elecraft] K3 Audio routing question
David Woolley (E.L)
forums at david-woolley.me.uk
Tue Jul 6 18:02:08 EDT 2010
What you are trying to achieve is a (rather expensive) implementation of
a, single, non-steerable, phased array antenna. If there really is no
phase difference, you've effectively synthesised a diagonally polarized
antenna (although I can't work out why your signal polarisations should
only occupy one quadrant). You don't have a diversity system. You
could achieve the same effect by summing at the input frequency after a
buffer/pre-amplifier.
If you actually summed both with and without a 180 degree shift between
the two signals, you could feed them into the main and sub-rx and get
true diversity between (for the diagonal case) the + and - 45 degree
polarisations. Whether that is any better than true diversity between 0
and 90 degrees, I don't know.
Top quoted through policy, not belief.
The Smiths wrote:
>
> When I have phase shifting between the two antennas I don't have
> Phase shifting in my audio Left and right. In that I mean, if I look at the
> voltage on the o'scope I do not see the signal coming out of my head
> phones phasing from positive voltage to a negative voltage in the
> inverse between the two headphone outputs (L/R).
> Unlike AC where when one side swings negative, if you were to add the inverse you would cancel out the entire signal (as you guys keep saying is the case), this is not the case with the diversity reception here at my QTH (and no I don't live in the bermuda triangle). The phase is in the antenna reception.. Not the audio that we listen to. When my vertical is picking up a vertical phased signal it is very possible that my Horizontal antenna is not receiving any signal at all.. Therefore if I have Mix on so that the sub is placed in the Main's headphone I do not cancel out the audio in the both ears. I am simply adding AUDIO, not phase, to one side of my headphone or the other.
>
--
David Woolley
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