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Message-ID: <249428.56994.qm@web28106.mail.ukl.yahoo.com>
Date: Tue, 12 Jan 2010 05:51:43 -0800 (PST)
From: M0FMT <m0fmt@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
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Subject: LF:Ice and frost on 600m antenna
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Hi LF Group
=C2=A0
In an attempt to calculating the effect of ICE (Haw frost) on my antenna=
 I get these results.=20
With a wire diameter of 1.5mm flex weave, it comes out to 1.1 amps for 60=
 watts RF applied. This is confirmed crudely by observing a pair of car fe=
stoon lamps (12Vx0.5A each) in parallel in the antenna up lead glowing to=
 full brightness.
With an estimated increase in antenna wire diameter to 10mm caused by the=
 Haw frost I did not notice any change in antenna current by this method.
Running the calculation through using a 10mm wire I get 1.2 amps and again=
 to an absurd size of 20mm diameter there is virtually no=C2=A0increase in=
 current.
=C2=A0
The recent WX at this location has had no noticeable effect on the antenna=
. If it did I would suspect leakage through a dodgy insulator at the top=
 of the inverted =E2=80=9CL=E2=80=9D up lead.
The type I use is a deeply ribbed glass insulator about 8 inches long.
73 es GL petefmt




     =20

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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D=
"top" style=3D"font: inherit;"><BR>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal>Hi LF Group</DIV>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal><?xml:namespace prefix=
 =3D o ns =3D "urn:schemas-microsoft-com:office:office" /><o:p>&nbsp;</o:p=
></DIV>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal>In an attempt to calcul=
ating the effect of ICE (Haw frost) on my antenna I get these results. </D=
IV>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal>With a wire diameter of=
 1.5mm flex weave, it comes out to 1.1 amps for 60 watts RF applied. This=
 is confirmed crudely by observing a pair of car festoon lamps (12Vx0.5A=
 each) in parallel in the antenna up lead glowing to full brightness.</DIV=
>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal>With an estimated incre=
ase in antenna wire diameter to 10mm caused by the Haw frost I did not not=
ice any change in antenna current by this method.</DIV>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal>Running the calculation=
 through using a 10mm wire I get 1.2 amps and again to an absurd size of=
 20mm diameter there is virtually no&nbsp;increase in current.</DIV>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal><o:p>&nbsp;</o:p></DIV>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal>The recent WX at this=
 location has had no noticeable effect on the antenna. If it did I would=
 suspect leakage through a dodgy insulator at the top of the inverted =E2=
=80=9CL=E2=80=9D up lead.</DIV>
<P style=3D"MARGIN: 0cm 0cm 0pt" class=3DMsoNormal>The type I use is a dee=
ply ribbed glass insulator about 8 inches long.</DIV><BR>73 es GL petefmt<=
BR><BR></td></tr></table><br>



     =20

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