[EMAIL PROTECTED] wrote:
> Modern DF arrays can fix a position from a single location. Modern
> DF arrays measure the phase differences very accurately and can use
> the phase difference to obtain directivity and azimuth.
One of the nice things about email reflectors like this one is that you
can learn a lot of useful things and also satisfy curiosity about some
things you have no use for. Since Eric is allowing the Wullenweber
discussion to go on despite general non-relevance to anything Elecraft:
What is the difference between "directivity" and "azimuth," save
possibly that azimuth is referenced to some arbitrary zero direction
(like North) and directivity maybe isn't? [teeny factoid: the US
military aircraft navigation system named TACAN uses a zero direction of
East -- always wondered why. Maybe to confuse the enemy?]
How does one obtain a complete set of coordinates for the origin of a
received signal using only one passive receiving site (i.e. no
transponder for time delay measurement)? I understand bearing (azimuth)
from the rx site ... how does one obtain distance?
I did think PA0SIM's phase coherent K2's was kind of cool. I don't know
if the phase shifts are exactly the same across separate K2's, but I
guess whatever difference there was would be constant and could be
factored out?
Inquiring minds want to know.
73,
Fred K6DGW
Auburn CA CM98lw
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