To: rsgb_lf_group@blacksheep.org
Date: Fri, 29 May 2015 20:12:48 -0400
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From: <riese-k3djc@juno.com>
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Subject: Re: LF: Antennas on low bands : the Siegel and Labus books.
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was thinking 600 meters,,, the info for 160 meters looks backyard ish

Bob K3DJC





On Fri, 29 May 2015 19:59:23 +0000 Rik Strobbe
<Rik.Strobbe@fys.kuleuven.be> writes:
Hi Bob,

small is a relative thing on LF.
A DDRR with a perimeter of 0.25 lambda and a height of 0.025 lamdba is
indeed small on 144MHz, but on 137kHz the perimeter becomes 550m and the
height a respectable 55m.
Not a backyard antenna ...

73, Rik  ON7YD - OR7T




Van: owner-rsgb_lf_group@blacksheep.org
[owner-rsgb_lf_group@blacksheep.org] namens riese-k3djc@juno.com
[riese-k3djc@juno.com]
Verzonden: vrijdag 29 mei 2015 18:30
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: Antennas on low bands : the Siegel and Labus books.


has anyone tried a DDRR antenna on LF
there is info on them in one of the arrl antenna books and I use one on 
144 very small but appears to work as well as a 5/8 wave
appears as a small horziontal loop but radiates as a vert
most odd thing but works well on 2 meters

Bob K3DJC

On Fri, 29 May 2015 17:19:24 +0200 =?iso-8859-1?B?R3V56SBBbmRy6Q==?=
<andre.guye1@aliceadsl.fr> writes:
Hi to all. 

I see that many questions are on the LF reflector about antennas on low
bands, modeling and concerning the lobe formation zones (Fresnel,
Fraunhofer and Rayleigh). On the way, that explain why IUT is using the
E.I.R.P. as standard of power.
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<DIV>&nbsp;</DIV>
<DIV>was thinking 600 meters,,, the info for 160 meters looks backyard ish<=
/DIV>
<DIV>&nbsp;</DIV>
<DIV>Bob K3DJC</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>On Fri, 29 May 2015 19:59:23 +0000 Rik Strobbe &lt;<A=20
href=3D"mailto:Rik.Strobbe@fys.kuleuven.be">Rik.Strobbe@fys.kuleuven.be</A>=
&gt;=20
writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 10px; MARGIN-LEFT: 10px; BORDER-LEFT: #000000 2px =
solid"=20
dir=3Dltr>
  <DIV=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Tahoma; COLOR: #000000; DIRECTION:=
 ltr">
  <P>Hi Bob,</P>
  <P>&nbsp;</P>
  <P>small is a relative thing on LF.</P>
  <P>A DDRR with a perimeter of 0.25 lambda and a height of 0.025 lamdba is=
=20
  indeed small on 144MHz, but on 137kHz the perimeter becomes 550m and the=
=20
  height a respectable 55m.</P>
  <P>Not a backyard antenna ...</P>
  <P>&nbsp;</P>
  <P>73, Rik&nbsp; ON7YD - OR7T</P>
  <P>&nbsp;</P>
  <DIV style=3D"FONT-SIZE: 16px; FONT-FAMILY: Times New Roman; COLOR: #=
000000">
  <HR tabIndex=3D-1>

  <DIV id=3DdivRpF192218 style=3D"DIRECTION: ltr"><FONT color=3D#000000 =
size=3D2=20
  face=3DTahoma><B>Van:</B> owner-rsgb_lf_group@blacksheep.org=20
  [owner-rsgb_lf_group@blacksheep.org] namens riese-k3djc@juno.com=20
  [riese-k3djc@juno.com]<BR><B>Verzonden:</B> vrijdag 29 mei 2015=20
  18:30<BR><B>Aan:</B> rsgb_lf_group@blacksheep.org<BR><B>Onderwerp:</B> Re=
: LF:=20
  Antennas on low bands : the Siegel and Labus books.<BR></FONT><BR></DIV>
  <DIV></DIV>
  <DIV>
  <DIV>has anyone tried a DDRR antenna on LF</DIV>
  <DIV>there is info on them in one of the arrl antenna books and I use one=
 on=20
  <BR>144 very small but appears to work as well as a 5/8 wave</DIV>
  <DIV>appears as a small horziontal loop but radiates as a vert</DIV>
  <DIV>most odd thing but works well on 2 meters</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Bob K3DJC</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>On Fri, 29 May 2015 17:19:24 +0200 =3D?iso-8859-1?B?R3V56SBBbmRy6Q=
=3D=3D?=3D=20
  &lt;<A href=3D"mailto:andre.guye1@aliceadsl.fr"=20
  target=3D_blank>andre.guye1@aliceadsl.fr</A>&gt; writes:</DIV>
  <BLOCKQUOTE=20
  style=3D"PADDING-LEFT: 10px; MARGIN-LEFT: 10px; BORDER-LEFT: #000000 2px =
solid"=20
  dir=3Dltr>
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    <P class=3DMsoNormal=20
    style=3D"MARGIN: 0cm 0cm 0pt; TEXT-JUSTIFY: inter-ideograph"=20
    align=3Djustify><FONT face=3D"Times New Roman">Hi to all. </FONT></P>
    <P class=3DMsoNormal=20
    style=3D"MARGIN: 0cm 0cm 0pt; TEXT-JUSTIFY: inter-ideograph"=20
    align=3Djustify><FONT face=3D"Times New Roman"></FONT>&nbsp;</P>
    <P class=3DMsoNormal=20
    style=3D"MARGIN: 0cm 0cm 0pt; TEXT-JUSTIFY: inter-ideograph"=20
    align=3Djustify><FONT face=3D"Times New Roman">I see that many =
questions are on=20
    the LF reflector about antennas on low bands, modeling and concerning =
the=20
    lobe formation zones (Fresnel, Fraunhofer and <SPAN=20
    style=3D"COLOR: ">Rayleigh). On the way, that explain why IUT is using =
the=20
    E.I.R.P. as standard of=20
    power.</SPAN></FONT></P></DIV></DIV></DIV></DIV></DIV></BLOCKQUOTE></=
DIV></DIV></DIV>
  <DIV>&nbsp;</DIV></BLOCKQUOTE></BODY></HTML>

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