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Folks,
can any body explain to me and others concerned, some things:
1)difference and efficacy between 2 things:case when U have a
sinusoidal shape of output signal in TX circuit,and when U
have quadrature shape of signal in TX circuit
I noticed,most of earlier detectors have sinus output.But later
projects do have quadrat.Some Fishers lately use second case.
In my experiments I noticed that in some cases quadrat provides
much stronger received signal,impassive in higher percent to
external clutters....or it is just my imagination.
2)how to convert sinus to quadrat and vice-versa on simpliest
level(i do have some complicated solutions)
3)Almost all IB designs done on principle simply to TX a signal
to TX coil and then to analyze RX signal.The most attention
is payed to received signal and it's processing through band-
pass filters,ampllifiers,shifters and lately DSP.During that
process U have a lack of some elements of RX signal.U can
compensate those lacks somehow, but at the end in most of the
cases U gain the simillar results.Now...how about idea to pay
most of attention on composition of a TX signal.How about to
generate very complicated and rich TX signal...let's say poliharmonic
(near-by freq.'s),put some delay,some decay(not as in PI) and
even to combine and make some array of sinus and quadrat signals
upon some time base.And than later to simply analyze received
signal without many lacking points.Simply just to receive and
a bit shaped RX.What I want to say to reverse the point of
conventional thinking.To try to prospect something more with
TX signal mostly. I noticed that most of IB's have very simple
TX, U may say obsolete, and everybody trying to improve only
RX circuitry....think about that!
4) The amplitude of TX signal is not need to be high.Many people
try to amplify it more and more.Besides what FCC said I think
it is not necessairly.Low freq. goes deep any way.But magnetic
field has limits.How to generate a very closely magnetic field
without a very strong signal?
And I do have many more questions, but I am not gonna bug U any
more.Those questions are enough.If I get answers on those, esspecially
on the third one I would be very satisfied.I am trying to start a
open-mind conversation, 'cose I noticed that on this forum are very
educated and good spirit people, which is rare this days on the
other forums. Congratulation to promoter(s) !!!