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From: "Dave G3WCB." <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Tue, 31 May 2011 20:59:47 +0100
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Subject: LF: VLF - G3XIZ QRT - Buckets!
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Chris,

Marcus uses stacked buckets - see e-mail below. He did post a photo of his
coil, but I can't find it at the moment.

73, Dave G3WCB

Dear Henny,

the coil consists of seven ordinary ten-liter polypropylene household

buckets, inserted upside-down into one another. The diameter of the buckets

is about 25 cm at the bottom and 21 cm near the top. Each bucket carries 460

turns of 0.4 mm enameled wire. The lead from the top end of one winding to

th bottom end of the next has to run alomg the winding, and is insulated

with several strips of tape an foam material. Total DC resistance is about

320 ohms.

The resonance is adjusted by the amount of overlap. Inserting the buckets

deeper into one another lowers the frequency by enhancing the mutual

inductive coupling, along with a slightly higher inter-layer capacitance. My

240 pF antenna requires a total length of about 60 cm for 9 kHz. For the 500

pF kite antenna I need only five buckets, and with larger spacing.

Best 73,

Markus (DF6NM)

  -----Original Message-----
  From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Chris Osborn
  Sent: 31 May 2011 15:39
  To: rsgb_lf_group@blacksheep.org
  Subject: Re: LF: VLF - G3XIZ QRT - MF QRV


        Thank you Stefan,

        I hope that you had a pleasant weekend and thank you for looking for
the signal.

        I have made some aerial improvements although not as much as I had
anticipated.
        I now have an inverted 'L'  48m long and with a mean height 11m
        I have far better insulators too.
        I shall do some more improvements later.

        My loading coil became unserviceable yesterday at 06.10Z whilst
transmitting.
        I think that a flying insect hit the wires and exploded, causing a
short-circuit.
        I have had this problem before with insects with high voltages.

        I shall try to rectify the coil and then see if my aerial shows an
improvement in signal strength.
        Eddie G3ZJO picks me up regularly and his VLF grabber is most
useful.

        Has anyone an easier way of making a 1.3 H loading coil ?
        My present dual-overlaid winding coil took many hours to make and
seems quite unreliable.

        73 Chris G3XIZ












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<BODY>
<DIV><SPAN class=3D859045419-31052011><FONT face=3DArial color=3D#0000=
ff   size=3D2>Chris,</FONT></SPAN></DIV>
<DIV><SPAN class=3D859045419-31052011><FONT face=3DArial color=3D#0000=
ff   size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D859045419-31052011><FONT face=3DArial color=3D#0000=
ff size=3D2>Marcus=20
uses stacked buckets - see e-mail below. He did post a photo of his co=
il, but I=20
can't find it at the moment.</FONT></SPAN></DIV>
<DIV><SPAN class=3D859045419-31052011><FONT face=3DArial color=3D#0000=
ff   size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D859045419-31052011><FONT face=3DArial color=3D#0000=
ff size=3D2>73,=20
Dave G3WCB </FONT></SPAN></DIV>
<DIV><SPAN class=3D859045419-31052011><FONT face=3DArial color=3D#0000=
ff   size=3D2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=3D859045419-31052011><FONT size=3D2>
<P>Dear Henny,</P>
<P>the coil consists of seven ordinary ten-liter polypropylene househo=
ld </P>
<P>buckets, inserted upside-down into one another. The diameter of the=
 buckets=20
</P>
<P>is about 25 cm at the bottom and 21 cm near the top. Each bucket ca=
rries 460=20
</P>
<P>turns of 0.4 mm enameled wire. The lead from the top end of one win=
ding to=20
</P>
<P>th bottom end of the next has to run alomg the winding, and is insu=
lated </P>
<P>with several strips of tape an foam material. Total DC resistance=
 is about=20
</P>
<P>320 ohms.</P>
<P>The resonance is adjusted by the amount of overlap. Inserting the=
 buckets=20
</P>
<P>deeper into one another lowers the frequency by enhancing the mutua=
l </P>
<P>inductive coupling, along with a slightly higher inter-layer capaci=
tance. My=20
</P>
<P>240 pF antenna requires a total length of about 60 cm for 9 kHz. Fo=
r the 500=20
</P>
<P>pF kite antenna I need only five buckets, and with larger spacing.<=
/P>
<P>Best 73,</P>
<P>Markus (DF6NM)</P></FONT></SPAN></DIV>
<BLOCKQUOTE>
  <DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT face=
=3DTahoma     size=3D2>-----Original Message-----<BR><B>From:</B>=20
  owner-rsgb_lf_group@blacksheep.org=20
  [mailto:owner-rsgb_lf_group@blacksheep.org]<B>On Behalf Of </B>Chris=
=20
  Osborn<BR><B>Sent:</B> 31 May 2011 15:39<BR><B>To:</B>=20
  rsgb_lf_group@blacksheep.org<BR><B>Subject:</B> Re: LF: VLF - G3XIZ=
 QRT - MF=20
  QRV<BR><BR></FONT></DIV>
  <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
    <TBODY>
    <TR>
      <TD vAlign=3Dtop>
        <DIV>Thank you Stefan,</DIV>
        <DIV>&nbsp;</DIV>
        <DIV>I hope that you had a pleasant weekend and thank you for=
 looking=20
        for the signal.</DIV>
        <DIV>&nbsp;</DIV>
        <DIV>I have made some aerial improvements although not as much=
 as I had=20
        anticipated.</DIV>
        <DIV>I now have an inverted 'L' &nbsp;48m long and with a mean=
 height=20
        11m</DIV>
        <DIV>I have&nbsp;far better insulators too.</DIV>
        <DIV>I shall do some more improvements later.</DIV>
        <DIV>&nbsp;</DIV>
        <DIV>My loading coil became unserviceable yesterday at 06.10Z=
 whilst=20
        transmitting.</DIV>
        <DIV>I think that a flying insect&nbsp;hit the wires and explo=
ded,=20
        causing a short-circuit.</DIV>
        <DIV>I have had this problem before&nbsp;with insects&nbsp;wit=
h high=20
        voltages.</DIV>
        <DIV>&nbsp;</DIV>
        <DIV>I shall try to rectify the&nbsp;coil and then see if my=
 aerial=20
        shows an improvement in signal strength.</DIV>
        <DIV>Eddie G3ZJO picks me up regularly&nbsp;and his VLF grabbe=
r is most=20
        useful.</DIV>
        <DIV>&nbsp;</DIV>
        <DIV>Has anyone an easier way of&nbsp;making a 1.3 H&nbsp;load=
ing coil=20
        ?</DIV>
        <DIV>My present dual-overlaid winding&nbsp;coil took many hour=
s to make=20
        and seems quite unreliable.</DIV>
        <DIV>&nbsp;</DIV>
        <DIV>73 Chris G3XIZ<BR><BR><BR><BR></DIV>
        <BLOCKQUOTE type=3D"cite"><BR>
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