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From: DK7FC <73dk7fc@googlemail.com>
Message-ID: <53AB44CD.1090200@gmail.com>
Date: Wed, 25 Jun 2014 23:53:17 +0200
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Subject: Re: LF: VLF in Canada - earth loop
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Hello Mark (again) (sri for the 10000000s of emails from me tonite :-) ),

Maybe interesting to know, i've made 40 km distance on 8.97 kHz in 
normal CW. Maybe 100km could have been possible if there were CW 
listeners to that time in that distance and in a quiet location...
.wav file: 
https://dl.dropboxusercontent.com/u/19882028/VLF/DK7FCinCWon8970Hzthe33kmband.WAV 
(23 MB)
But that was with a 300m vertical and 900 W RF power (350W average power 
but a "booster" cap of 10x6000 uF / 350V for the PA :-) ) :-) .

73, Stefan

Am 25.06.2014 23:27, schrieb DK7FC:
> Hello Mark,
>
> 200W in such a loop and 8.97 or 8.27 kHz, CW, my guess is that the 
> distance is less than 2 km. But it depends on the type of the RX 
> antenna (E or H field).
>
> 73, Stefan/DK7FC
>
> Am 25.06.2014 18:47, schrieb mbdittmar@comcast.net:
>> Hi -
>>
>> I've been following the discussion on 9 khz transmit antennas with 
>> some interest, as a friend of mine, Tom, KD0VBR, has done some 
>> preliminary experimentation in this area ( using large loading coils 
>> w/ vertical ).  Tom asked me to post a query regarding some antenna 
>> ideas he has, and it would be great to hear the group's thoughts on 
>> them and whether they might work or not.  73, Mark AB0CW
>>
>> Below are his questions:
>>
>> ------------------------------------------------------------------------
>> *From: *"Pouliot, Tom" <tomandmarti@hotmail.com>
>> *To: *"Dittmar, Mark" <mbdittmar@comcast.net>
>> *Sent: *Wednesday, June 25, 2014 8:51:48 AM
>> *Subject: *RE: LF: VLF in Canada - earth loop
>>
>> Hi Mark,
>> That would be great if you could post some questions about 
>> transmitting loops for VLF.
>> Thinking about a square loop 200' per side 10' off the ground  #8 
>> wire with 200 watts into the antenna. How far away could one expect 
>> to be able to detect a CW signal ? ( not QRSS)
>> Another possibility would be a triangular loop 200' per side with a 
>> 50' high apex.
>>
>> Tom
>>
>> ------------------------------------------------------------------------

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Hello Mark (again) (sri for the 10000000s of emails from me tonite :-)
),<br>
<br>
Maybe interesting to know, i've made 40 km distance on 8.97 kHz in
normal CW. Maybe 100km could have been possible if there were CW
listeners to that time in that distance and in a quiet location...<br>
.wav file:
<a class="moz-txt-link-freetext" href="https://dl.dropboxusercontent.com/u/19882028/VLF/DK7FCinCWon8970Hzthe33kmband.WAV">https://dl.dropboxusercontent.com/u/19882028/VLF/DK7FCinCWon8970Hzthe33kmband.WAV</a>
(23
MB)<br>
But that was with a 300m vertical and 900 W RF power (350W average
power but a "booster" cap of 10x6000 uF / 350V for the PA :-) ) :-) .<br>
<br>
73, Stefan<br>
<br>
Am 25.06.2014 23:27, schrieb DK7FC:
<blockquote cite="mid:53AB3EB8.5060705@gmail.com" type="cite">
  <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
Hello Mark, <br>
  <br>
200W in such a loop and 8.97 or 8.27 kHz, CW, my guess is that the
distance is less than 2 km. But it depends on the type of the RX
antenna (E or H field).<br>
  <br>
73, Stefan/DK7FC<br>
  <br>
Am 25.06.2014 18:47, schrieb <a moz-do-not-send="true"
 class="moz-txt-link-abbreviated" href="mailto:mbdittmar@comcast.net:">mbdittmar@comcast.net:</a>
  <blockquote
 cite="mid:751419392.10617770.1403714825805.JavaMail.root@comcast.net"
 type="cite">
    <div
 style="font-family: Arial; font-size: 12pt; color: rgb(0, 0, 0);">
    <div aria-label="Compose body">Hi - <br>
    </div>
    <div aria-label="Compose body"><br>
    </div>
    <div aria-label="Compose body">I've been following the discussion
on
9 khz transmit antennas with some interest, as a friend of mine, Tom,
KD0VBR, has done some preliminary experimentation in this area ( using
large loading coils w/ vertical ).  Tom asked me to post a query
regarding some antenna ideas he has, and it would be great to hear the
group's thoughts on them and whether they might work or not.  73, Mark
AB0CW</div>
    <div aria-label="Compose body"><br>
    </div>
    <div aria-label="Compose body">Below are his questions:<br>
    </div>
    <div><br>
    </div>
    <hr id="zwchr">
    <div
 style="color: rgb(0, 0, 0); font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"
 data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From:

    </b>"Pouliot, Tom" <a moz-do-not-send="true"
 class="moz-txt-link-rfc2396E" href="mailto:tomandmarti@hotmail.com">&lt;tomandmarti@hotmail.com&gt;</a><br>
    <b>To: </b>"Dittmar, Mark" <a moz-do-not-send="true"
 class="moz-txt-link-rfc2396E" href="mailto:mbdittmar@comcast.net">&lt;mbdittmar@comcast.net&gt;</a><br>
    <b>Sent: </b>Wednesday, June 25, 2014 8:51:48 AM<br>
    <b>Subject: </b>RE: LF: VLF in Canada - earth loop<br>
    <div><br>
    </div>
    <div dir="ltr"><span style="font-size: large;"
 data-mce-style="font-size: large;">Hi Mark,</span>
    <div><span style="font-size: large;"
 data-mce-style="font-size: large;">That would be great if you could
post some questions about transmitting loops for VLF.</span></div>
    <div><span style="font-size: large;"
 data-mce-style="font-size: large;">Thinking about a square loop 200'
per side 10' off the ground  #8 wire with 200 watts into the antenna.
How far away could one expect to be able to detect a CW signal ? ( not
QRSS)</span></div>
    <div><span style="font-size: large;"
 data-mce-style="font-size: large;">Another possibility would be a
triangular loop 200' per side with a 50' high apex.</span></div>
    <div><span style="font-size: large;"
 data-mce-style="font-size: large;"><br>
    </span></div>
    <div><span style="font-size: large;"
 data-mce-style="font-size: large;">Tom<br>
    </span><br>
    <div id="stopSpelling">
    <hr id="stopSpelling"></div>
    </div>
    </div>
    </div>
    </div>
  </blockquote>
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