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References: <F34AE1C11C9F44D2950EC49C5A2196A6@gmc.net> <op.vpan5am6yzqh0k@pc-roelof> <4D7062BE2D504CA4A55BDE1C7103CF31@gmc.net> <op.vpat3gvlyzqh0k@pc-roelof> <1295011560.4164.19.camel@pat-compaq-evo> <op.vpa4ein0yzqh0k@pc-roelof>
Date: Fri, 14 Jan 2011 09:15:40 -0800 (PST)
From: Daniele Tincani <danieletincani@yahoo.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Re: Mini-Whip Antenna
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Hello Roelof,

what do you mean exactly by "difficult cases"?

Regards
Daniele




________________________________
From: Roelof Bakker <roelof@ndb.demon.nl>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, January 14, 2011 5:36:08 PM
Subject: Re: LF: Re: Mini-Whip Antenna

> Hi Roelof,
> 
> Some interesting comments there.
> 
> On the topic of feeder pick up Alan G3NYK and myself have had many
> conversations over the years about ways to deal with the problem and a
> method we've never got around to trying but I now have some components
> to try (when I get a "roundtooit") is to convert (E/O) electrical to
> optical at the feedpoint and then conduct by fibre through the noise
> field converting back to demodulated baseband in the shack. The problem
> of powering the feedpoint equipment may be overcome by using batteries
> (possibly solar-charged) thus avoiding further noise pick up and
> re-radiation from power source cabling.
> 
> 73

Yes, this is an excellent idea and to be honest I have already acquired the 
necessary parts for some time, but have not come round yet to use them. An other 
idea that I have tested and can give excellent results in difficult cases is to 
use CAT5 network cable.
I used rf-isolating transformers at both ends for the signal pair and common 
mode chokes at both ends for the pair carrying power to the antenna.

73,
Roelof, pa0rdt


      

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<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><DIV>Hello Roelof,</DIV>
<DIV>&nbsp;</DIV>
<DIV>what do you mean exactly by "difficult cases"?</DIV>
<DIV>&nbsp;</DIV>
<DIV>Regards</DIV>
<DIV>Daniele<BR></DIV>
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif"><BR>
<DIV style="FONT-SIZE: 13px; FONT-FAMILY: arial, helvetica, sans-serif"><FONT face=Tahoma size=2>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Roelof Bakker &lt;roelof@ndb.demon.nl&gt;<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> rsgb_lf_group@blacksheep.org<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Fri, January 14, 2011 5:36:08 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: LF: Re: Mini-Whip Antenna<BR></FONT><BR>&gt; Hi Roelof,<BR>&gt; <BR>&gt; Some interesting comments there.<BR>&gt; <BR>&gt; On the topic of feeder pick up Alan G3NYK and myself have had many<BR>&gt; conversations over the years about ways to deal with the problem and a<BR>&gt; method we've never got around to trying but I now have some components<BR>&gt; to try (when I get a "roundtooit") is to convert (E/O) electrical to<BR>&gt; optical at the feedpoint and then conduct by fibre through the noise<BR>&gt; field converting back to demodulated baseband in the shack. The problem<BR>&gt; of powering the feedpoint equipment may be overcome
 by using batteries<BR>&gt; (possibly solar-charged) thus avoiding further noise pick up and<BR>&gt; re-radiation from power source cabling.<BR>&gt; <BR>&gt; 73<BR><BR>Yes, this is an excellent idea and to be honest I have already acquired the necessary parts for some time, but have not come round yet to use them. An other idea that I have tested and can give excellent results in difficult cases is to use CAT5 network cable.<BR>I used rf-isolating transformers at both ends for the signal pair and common mode chokes at both ends for the pair carrying power to the antenna.<BR><BR>73,<BR>Roelof, pa0rdt<BR><BR></DIV></DIV></div><br>

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