Message-ID: <4CBA2BE5.2010909@iup.uni-heidelberg.de>
Date: Sun, 17 Oct 2010 00:49:09 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: F4DTL to ON7YD
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Hello Nicolas,

With a higher diameter you get more L at less turns, so more volts per=20
turn. This makes it necessary to use a better wire insulation or a=20
higher wire spacing, depending on the power. Keeping the coil dry is=20
important, no matter what wire you use. Thus i have to go immediately=20
QRT on VLF when it starts to rain. On LF, it is enough just to cover the=
=20
coil by a trash bag...

73 and GL, Stefan/DK7FC



Am 17.10.2010 00:36, schrieb F4DTL@aol.com:
> Hello Rik,LF
> Because I had this diameter in PVC and especially to limit the losses=20
> in the coil.Less length of wire and of course a better Q=20
> factor.Unfortunately this afternoon I wanted to increase the power for=
=20
> a last test to 430W,it was raining and there is an spark between two=20
> coils and a beautiful burns.Too much voltage can be a problem or=20
> isolation of wires? I will repair it with news tests. I did not know=20
> that these diameters are more vulnerable to losses in nearby object.=20
> Thanx for this information.
> If you want some pictures give your personal email Rick.
> *F4DTL Nicolas JN18FP*
> Dans un e-mail dat=E9 du 16/10/2010 15:36:50 Paris, Madrid (heure=20
> d'=E9t=E9), Rik.Strobbe@fys.kuleuven.be a =E9crit :
>
>     Hello Nicolas,
>     is there any particular reason you made a large diameter loading
>     coil ?
>     I recall a discussion (maybe 10 years ago) on this reflector where
>     the outcome was that large diameter coils (to a certain extend)
>     have a better Q, but are also more vulnerable to losses in nearby
>     object.
>     73, Rik  ON7YD
>

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Hello Nicolas,<br>
<br>
With a higher diameter you get more L at less turns, so more volts per
turn. This makes it necessary to use a better wire insulation or a
higher wire spacing, depending on the power. Keeping the coil dry is
important, no matter what wire you use. Thus i have to go immediately
QRT on VLF when it starts to rain. On LF, it is enough just to cover
the coil by a trash bag...<br>
<br>
73 and GL, Stefan/DK7FC<br>
<br>
<br>
<br>
Am 17.10.2010 00:36, schrieb <a class="moz-txt-link-abbreviated" href="mailto:F4DTL@aol.com:">F4DTL@aol.com:</a>
<blockquote cite="mid:12d39.21c49c07.39eb82d5@aol.com" type="cite">
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  <div>
  <div>Hello Rik,LF</div>
  <div>&nbsp;</div>
  <div>Because I had this diameter in PVC&nbsp;and especially to limit the
losses in the coil.Less length of wire and of course a better Q
factor.Unfortunately this&nbsp;afternoon I wanted to increase the power for
a last test to 430W,it was raining and there is an&nbsp;spark between two
coils&nbsp;and a beautiful burns.Too much voltage can be a problem or
isolation of wires? I will repair it with news tests. I did not know
that these diameters are more vulnerable to losses in nearby object.
Thanx for this information.</div>
  <div>&nbsp;</div>
  <div>If you want some pictures give your personal email Rick.</div>
  <div>&nbsp;</div>
  <div><strong>F4DTL Nicolas JN18FP</strong></div>
  <div>&nbsp;</div>
  <div>&nbsp;</div>
  <div>&nbsp;</div>
  <div>Dans un e-mail dat&eacute; du 16/10/2010 15:36:50 Paris, Madrid (heure
d'&eacute;t&eacute;), <a class="moz-txt-link-abbreviated" href="mailto:Rik.Strobbe@fys.kuleuven.be">Rik.Strobbe@fys.kuleuven.be</a> a &eacute;crit :</div>
  <blockquote   style="border-left: 2px solid blue; padding-left: 5px; margin-left: 5px;"><font   style="background-color: transparent;" color="#000000" face="Tahoma"   size="2">
    <div>Hello Nicolas,</div>
    <div>&nbsp;</div>
    <div>is there any particular reason you made a large diameter
loading coil ?</div>
    <div>I recall a discussion (maybe 10 years ago) on this reflector
where the&nbsp;outcome was that large diameter&nbsp;coils (to a certain extend)
have a better Q, but are also more vulnerable to losses in nearby
object.</div>
    <div>&nbsp;</div>
    <div>73, Rik&nbsp; ON7YD&nbsp;&nbsp;</div>
    <div dir="ltr">&nbsp;</div>
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  <div>&nbsp;</div>
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  <div>&nbsp;</div>
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