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Date: Thu, 11 Aug 2011 05:08:20 -0700 (PDT)
From: Daniele Tincani <danieletincani@yahoo.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
In-Reply-To: <op.vz1omdp2yzqh0k@pc-roelof>
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Subject: Re: LF: Re: HB9ASB...
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Hello Roelof,=0A=A0=0Ain fact a comparison, between a=A0battery-powered Min=
i-Whip with optical feedline and another with "conventional" installation, =
would probably clarify the subject. One could measure what the coax effects=
 are on antenna performances.=0A=A0=0ARegards=0AD.=0A=A0=0A=0AFrom: Roelof =
Bakker <roelof@ndb.demon.nl>=0ATo: rsgb_lf_group@blacksheep.org=0ASent: Thu=
rsday, August 11, 2011 12:26 PM=0ASubject: Re: LF: Re: HB9ASB...=0A=0AHello=
 Andy,=0A=0AThe antenna will work with an optical feedline.=0AI can't imagi=
ne that fiber optic forms the other half of the dipole.=0A=0AThe probe capa=
citance is rather low, about 3 pF.=0AMy guess is that the "counterpoise" is=
 formed by the PCB part, carrying the buffer amplifier.=0A=0AThe layout of =
the PCB art work has some effect on the received signal strength.=0AUsing l=
eaded components, the pick up area measures 30 x 40 mm.=0AA PCB with SMD pa=
rts will give the same output with an "antenna" measuring 24 x 30 mm.=0A=0A=
73,=0ARoelof, pa0rdt
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ar=
ial, helvetica, sans-serif;font-size:10pt"><div style=3D"RIGHT: auto"><SPAN=
 style=3D"RIGHT: auto">Hello Roelof,</SPAN></div>
<div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto"></SPAN>&nbsp;</div>
<div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto">in fact a comparison=
, between a&nbsp;battery-powered Mini-Whip with optical feedline and anothe=
r with "conventional" installation, would probably clarify the subject. One=
 could measure what the coax effects are on antenna performances.<VAR id=3D=
yui-ie-cursor></VAR></SPAN></div>
<div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto"></SPAN>&nbsp;</div>
<div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto">Regards</SPAN></div>
<div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto">D.</SPAN></div>
<div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto"></SPAN>&nbsp;</div>
<div><BR></div>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif">
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, time=
s, serif"><FONT face=3DArial size=3D2>
<DIV class=3Dhr style=3D"BORDER-RIGHT: #ccc 1px solid; PADDING-RIGHT: 0px; =
BORDER-TOP: #ccc 1px solid; PADDING-LEFT: 0px; FONT-SIZE: 0px; PADDING-BOTT=
OM: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADD=
ING-TOP: 0px; BORDER-BOTTOM: #ccc 1px solid; HEIGHT: 0px" readonly=3D"true"=
 contenteditable=3D"false"></DIV><B><SPAN style=3D"FONT-WEIGHT: bold">From:=
</SPAN></B> Roelof Bakker &lt;roelof@ndb.demon.nl&gt;<BR><B><SPAN style=3D"=
FONT-WEIGHT: bold">To:</SPAN></B> rsgb_lf_group@blacksheep.org<BR><B><SPAN =
style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, August 11, 2011 12:2=
6 PM<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> Re: LF: Re=
: HB9ASB...<BR></FONT><BR>Hello Andy,<BR><BR>The antenna will work with an =
optical feedline.<BR>I can't imagine that fiber optic forms the other half =
of the dipole.<BR><BR>The probe capacitance is rather low, about 3 pF.<BR>M=
y guess is that the "counterpoise" is formed by the PCB part, carrying the =
buffer
 amplifier.<BR><BR>The layout of the PCB art work has some effect on the re=
ceived signal strength.<BR>Using leaded components, the pick up area measur=
es 30 x 40 mm.<BR>A PCB with SMD parts will give the same output with an "a=
ntenna" measuring 24 x 30 mm.<BR><BR>73,<BR>Roelof, pa0rdt<BR><BR><BR><BR><=
/DIV></DIV></div></body></html>
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