Your comment that the loop is a current source with a
series reactance is interesting.
My understanding, is that a small loop
can be considered as a voltage source in series with the inductance of the loop,
the ohmic losses, and the negligle radiation resistance.? For a given field
strength, the voltage output is proportional to frequency.? The equivalent
current source has an output which is proportional to field strength only, and
has a shunt, not series, inductance.
What am I missing?
Tnx and
73
John? KC0G
?
?
?Hi John,
?
?
What I believe is happening; the H Field induces a
current into loop, this current is not?frequency related. However, as the
loop has a rising? series impedance with frequency the loops terminal
voltage is the product the induce current x the impedance. Hence we see that the
Vout is proportional to frequency.
?
This issue of the loops series reactance impeding the
current is discussed in a GB patent for the Liniplex loop manufactured by Phase
Track in the early nineties. I can't find my copy of this patent. A search for
patents by Charles Edward Forster my find it. The Liniplex loop used multiple
loops in parallel to?reduce the?series reactance from impeding the
current to the amplifier.
?
Getting back to the real issue here, we have a loop
with output z that is frequency dependant, therefore optimum power transfer to
the amplifier will only happen when the amplifier input z matches the loop.
