I've just posted version 3.66 of my coil calculator:
http://ham-radio.com/k6sti/coil.zip
Some recent changes:
Accuracy
I recalibrated my HP 4342A Q Meter and remeasured a number of the
trickier coils in my collection. I recalibrated COIL to account for some
small changes. Average error magnitude is 2.5% for L and 6.5% for Q. See
COILS.TXT for coil dimensions, measurements, and error statistics. Both
L and Q calibration are user-adjustable.
Metals
I've added several flavors of copper and some high-conductivity alloys
of aluminum. Aluminum is particularly useful for lightweight Yagi
loading coils. I've included information and references on the effect of
tin plating.
Litz wire
COIL now models Litz wire with 0.02 mm strands, available from
Electrisola. You can use this wire to make 40-meter coils with very high
Q. Values up to three times those possible with copper tubing and
greater than 2000 are feasible. Litz wire with #48 AWG strands,
available on eBay, is suitable for 80-meter coils with similar Q.
Optimizer
The optimizer varies selected coil parameters to maximize Q while
keeping inductance constant. Due to code refinement and use of assembly
language, it now runs virtually instantaneously even on older computers.
(Although I haven't tried it, COIL should run on a 486. I've run it on
Windows XP and Windows 10.)
I don't monitor Towertalk. To reach me, click on my callsign on the COIL
screen.
Brian
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