NEC-LIST: Coil success

Latest solenoid inductor tests and test of the K6STI coil calculator at
2.05 MHz.

K6STI Q calculation of the Air Dux style inductor: 409
Measured: 244

K6STI Q calculation of the PVC coil form inductor: 394
Measured: 164

Note that the K6STI calculator does not account for the wire insulation.
In this case there an additional 4 pF or so across the inductor. I
calculated the dissipation factor (DF) of the PVC form plus wire (PVC
insulation?) as 0.1. I found the link below that states the DF of 0.072
for PVC wire insulation. So I am able to account for the insulation
losses.

http://www.dupont.com/industrial-polymers/elvaloy/loy_pvc3.html

At this point it appears that the K6STI program over estimates coil Q
and certainly doesn't account for the wire insulation.

The problem with the measurements yesterday turned out to be the series
resonating capacitor. It is a ceramic capacitor with a specified Q of
>1000 but it sure doesn't meet this spec. The capacitor today is a 470
pF, 500 V silver mica.

     Dave Cuthbert WX7G
     Micron Technology

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