[TowerTalk] COIL 3.66

[Brian Beezley]

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