MICROPROCESSOR??????
1. The Wellbrook is NOT a tuned loop.
2. How does the loop know what frquency the radio is
tuned to...ESP?
--- gandalfg8@... wrote:
In a message dated 10/03/2007 08:45:02 GMT Standard
Time,
c.beijersbergen@... writes:
And BTW, what should the microprocessor be doing in
there?
--------------------------------------
It's used for the automatic tuning.
In order to cover the wide bandwidth the antenna has
to be electronically
tuned to the correct operating frequency and this is
done by rapidly sweeping
the tuning across the whole band and monitoring for
the point at which energy
absorbed by the radio is greatest as this will
correspond to the tuned
frequency of the radio.
Fortunately, even a modest microprocessor can scan
much faster than a human
operator, or even the fastest scanner, so this
process can be repeated rapidly
and remain transparent to the operator.
When a predermined number of scans return the same
result the tuning remains
fixed but the energy absorbed continues to be
monitored.
If the absorbed energy returns to the pretuned
value, or decreases to a
significant extent, it is assumed the radio tuning
has changed and the whole
process repeats.
This all happens millions of time a second, so is
never obvious to the user,
and part of the design process has to establish the
proper times for tuning
period and dwell in order to ensure that no tuning
lag occured whilst
minimising the need for repeat cycles.
This great advance in antenna technology is the
subject of a number of
patent applications and the electronics are potted
in order to protect the
designer's intellectual property rights.
[Non-text portions of this message have been
removed]
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