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Date: Wed, 25 Sep 2013 15:21:20 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: TA CW?
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Hi Bob,

Am 25.09.2013 03:01, schrieb Bob Raide:
> [...]But only have a 90' high tower and at the top is the center feed 
> point of my 75 meter double extended zepp.  I simply short the open 
> wire line which runs almost vertically and fed it with allot of 
> inductance in series! I assume the two 150' legs acts as top 
> loading. Ground system is from my broadcast experience where for field 
> intensity surveys 36" wide chicken wire was used with a 100' tower 
> most often and a 250 transmitter.  Eight 50' chicken wire radials 
> produced decent field on the midband channels [1000 kHz or so] to 
> measure from.  Here I am using several 150' radials of chicken wire 
> radials.  I hope to stretch some out to 300' but that's going to be 
> about it at my location.

Can you post a link to some photos showing the tower and environment ?

Do you use deep earth rods additionally to the wire radials? Can you add 
even more capacitive load to the top of the tower, giving an umbrella 
antenna. 600 pF, as Alan sais, is nice but not much on 73 kHz and you 
seem to be voltage limited now (like me, sometimes :-) ).
Some images would be interesting for us i think.

73, Stefan/DK7FC

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Hi Bob, <br>
<br>
Am 25.09.2013 03:01, schrieb Bob Raide:
<blockquote cite="mid:BLU180-W5184AE36F6E704B0DE2E29AC2F0@phx.gbl"
 type="cite">
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  <div dir="ltr">[...]But only have a 90' high tower and at the top is
the center feed point of my 75 meter double extended zepp.&nbsp; I simply
short the open wire line which runs almost vertically&nbsp;and fed it with
allot of inductance in series!&nbsp;I assume the two 150' legs acts as top
loading.&nbsp;Ground system is from my broadcast experience where for field
intensity surveys 36" wide&nbsp;chicken wire was used with a 100' tower most
often and a 250 transmitter.&nbsp;&nbsp;Eight 50' chicken wire radials produced
decent&nbsp;field on the midband channels [1000 kHz or so] to measure from.&nbsp;
Here I am using several 150' radials of chicken wire radials.&nbsp; I hope
to stretch some out to 300' but that's going to be about it at my
location. <br>
  </div>
</blockquote>
<br>
Can you post a link to some photos showing the tower and environment ? <br>
<br>
Do you use deep earth rods additionally to the wire radials? Can you
add even more capacitive load to the top of the tower, giving an
umbrella antenna. 600 pF, as Alan sais, is nice but not much on 73 kHz
and you seem to be voltage limited now (like me, sometimes :-) ). <br>
Some images would be interesting for us i think.<br>
<br>
73, Stefan/DK7FC<br>
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