[TowerTalk] (no subject)

Sun Mar 17 08:27:18 EDT 2019

" <towertalk at contesting.com>
From: Brian Beezley <k6sti at att.net>
Subject: Coil Inductance and Q Calculator
Date: Sun, 17 Mar 2019 05:27:14 -0700
Importance: normal
X-Priority: 3
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Some time ago VE7RF wrote:

##  My problem  with his latest  coil program is   you can
only enter wire gauge.  At least on his  original program,
you could enter decimal point   inches.=20

## It gets  a lot worse.  K6STIs  latest version called ..coil 3.44  isnt e=
ven=20
close to reality !   Doesnt work, dont use it.

You can enter wire diameter in AWG, SWG, inches, or millimeters.

I=E2=80=99ve exchanged email with Jim. He based his accuracy conclusion on =
measurements at 1 kHz with an LCR meter. Due to self-resonance, the effecti=
ve inductance of a coil increases with frequency. COIL.EXE reports effectiv=
e inductance at the frequency specified.

I measured a couple dozen test coils with my HP 4342A Q meter. Then I compa=
red measured inductance and Q with values calculated by COIL.EXE. Average i=
nductance error was 2.5% and average Q error was 7.9%. Complete results are=
 in COILS.TXT, which is included with coil.zip.

You can download the program here:

http://ham-radio.com/k6sti/coil.zip

Please read README.TXT. After starting the program, click on Info (three pl=
aces) to learn how to use it.

I don=E2=80=99t monitor TowerTalk. If you have a question, please email me.

Brian

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--></style></head><body lang=3DEN-US link=3D"#0563C1" vlink=3D"#954F72"><di=
v class=3DWordSection1><p class=3DMsoNormal>Some time ago VE7RF wrote:</p><=
p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal><o:p> </=
o:p></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:Co=
nsolas;color:black'>##=C2=A0 My problem=C2=A0 with his latest=C2=A0 coil pr=
ogram is=C2=A0=C2=A0 you can<o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'font-size:10.0pt;font-family:Consolas;color:black'>only enter wi=
re gauge.=C2=A0 At least on his=C2=A0 original program,<o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:Consolas=
;color:black'>you could enter decimal point=C2=A0=C2=A0 inches. <o:p></o:p>=
</span></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family=
:Consolas;color:black'><o:p> </o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'font-size:10.0pt;font-family:Consolas;color:black'>## It gets=
=C2=A0 a lot worse.=C2=A0 K6STIs=C2=A0 latest version called ..coil 3.44=C2=
=A0 isnt even <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'fon=
t-size:10.0pt;font-family:Consolas;color:black'>close to reality !=C2=A0=C2=
=A0 Doesnt work, dont use it.<o:p></o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'font-size:10.0pt;font-family:Consolas;color:black'><o:p> <=
/o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-f=
amily:Consolas;color:black'><o:p> </o:p></span></p><p class=3DMsoNorma=
l>You can enter wire diameter in AWG, SWG, inches, or millimeters.</p><p cl=
ass=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>I=E2=80=99ve exch=
anged email with Jim. He based his accuracy conclusion on measurements at 1=
 kHz with an LCR meter. Due to self-resonance, the effective inductance of =
a coil increases with frequency. COIL.EXE reports effective inductance at t=
he frequency specified.</p><p class=3DMsoNormal><o:p> </o:p></p><p cla=
ss=3DMsoNormal>I measured a couple dozen test coils with my HP 4342A Q mete=
r. Then I compared measured inductance and Q with values calculated by COIL=
.EXE. Average inductance error was 2.5% and average Q error was 7.9%. Compl=
ete results are in COILS.TXT, which is included with coil.zip.</p><p class=
=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>You can download the=
 program here:</p><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoN=
ormal><a href=3D"http://ham-radio.com/k6sti/coil.zip">http://ham-radio.com/=
k6sti/coil.zip</a></p><p class=3DMsoNormal><o:p> </o:p></p><p class=3D=
MsoNormal>Please read README.TXT. After starting the program, click on Info=
 (three places) to learn how to use it.</p><p class=3DMsoNormal><o:p> =
</o:p></p><p class=3DMsoNormal>I don=E2=80=99t monitor TowerTalk. If you ha=
ve a question, please email me.</p><p class=3DMsoNormal><o:p> </o:p></=
p><p class=3DMsoNormal>Brian</p></div></body></html>=

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