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Message-ID: <003301c8464b$13a91a00$13327ad5@w4o8m9>
From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
References: <be7.249a9667.34a12493@aol.com>
Date: Mon, 24 Dec 2007 16:36:04 -0000
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Subject: LF: Re: E-field probes.
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Dear David, LF Group,

There are plenty of broadband active whip designs that will work up to 30MHz=
 or more, mostly depending on the amplifier bandwidth. I imagine an issue wi=
th using such a design on a satellite would be that it would have to work in=
 close proximity to VHF/UHF transmitters, which would be likely to grossly o=
verload the whip preamp without some sort of selectivity at the antenna, so=20=
some kind of  tuned whip or loop might be more appropriate. Another possibil=
ity might be to design a diplexer/receive preamp to make use of an existing=20=
higher frequency antenna element as the 29MHz receive antenna.

Cheers, Jim Moritz
73 de M0BMU
  ----- Original Message -----=20
  From: G0MRF@aol.com=20
  To: rsgb_lf_group@blacksheep.org=20
  Sent: Monday, December 24, 2007 3:04 PM
  Subject: LF: E-field probes.


  Seasons greetings all.

  Does anyone know if the e-field probe can be adatped to HF frequencies?

  Some of you will know I am a member of Amsat and we have an opportunity wh=
ere we could propose a single frequency 29MHz 'SSB' receiver on a satellite.=
  However, as we will not be allowed a large traditional antenna.  I wondere=
d if I could propose an e-field probe for 29MHz.

  Is there any data / design information anywhere which may help make a deci=
sion?

  Regards

  David  G0MRF

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<META content=3D"MSHTML 6.00.2800.1106" name=3DGENERATOR>
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<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY:=20=
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<DIV>Dear David, LF Group,</DIV>
<DIV>&nbsp;</DIV>
<DIV>There are plenty of broadband active whip designs that will work up to=20
30MHz or more, mostly depending on the amplifier bandwidth. I imagine an iss=
ue=20
with using such a design on a satellite would be that it would have to work=20=
in=20
close proximity to VHF/UHF transmitters, which would be likely to grossly=20
overload the whip preamp without some sort of selectivity at the antenna, so=
=20
some kind of&nbsp; tuned whip or loop might be more appropriate. Another=20
possibility might be to design a diplexer/receive preamp to make use of an=20
existing&nbsp;higher frequency antenna element as the 29MHz receive=20
antenna.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Cheers, Jim Moritz</DIV>
<DIV>73 de M0BMU</DIV>
<BLOCKQUOTE dir=3Dltr   style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARG=
IN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV     style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black=
"><B>From:</B>=20
  <A title=3DG0MRF@aol.com href=3D"mailto:G0MRF@aol.com">G0MRF@aol.com</A> <=
/DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Drsgb_lf_group@blacks=
heep.org     href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blac=
ksheep.org</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, December 24, 2007 3:0=
4=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> LF: E-field probes.</DIV>
  <DIV><BR></DIV><FONT id=3Drole_document face=3DArial color=3D#000000 size=
=3D2>
  <DIV>Seasons greetings all.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Does anyone know if the e-field probe can be adatped to&nbsp;HF=20
  frequencies?</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Some of you will know I am a member of Amsat and we have an opportuni=
ty=20
  where we could&nbsp;propose a single frequency 29MHz 'SSB' receiver on a=20
  satellite.&nbsp; However, as we will not be allowed a large traditional=20
  antenna. &nbsp;I wondered if I could propose an e-field probe for 29MHz.</=
DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Is there any data / design information anywhere which may help make a=
=20
  decision?</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Regards</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>David&nbsp; G0MRF</DIV></BLOCKQUOTE></FONT></BODY></HTML>

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