Message-ID: <002d01ccac24$8ebd1be0$0401a8c0@xphd97xgq27nyf>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <BAY154-W46E722A4D4B5201E7F854DD3C30@phx.gbl>,<66E491BAB91C48AF81191F4022525A14@DennisPC> <BF4A524700075746A6467658DFC7102CB0B489A4F0@ICTS-S-EXC2-CA.luna.kuleuven.be> <6FE757960E6C447781689D4F19A315AE@DennisPC> <4EC2C6EB.2080201@iup.uni-heidelberg.de> <4EC2DB14.9000807@talktalk.net> <4ECFD8B6.2050601@iup.uni-heidelberg.de>
Date: Sat, 26 Nov 2011 10:17:09 -0000
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Subject: Re: VLF: 8970 Hz transmissions, soon again here
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Stefan
If I can hear/see your signal I will call on 7033 Khz with a report and =
you can reply on 8970. I will let you know what speed I can receive you =
at. I will increase speed until you disappear.=20
For interest to all, 40 metres is excellent at present to the USA, W2RE =
is on CW 7033 at 599, this could be a good sign for MF es LF today
de mal/g3kev

  ----- Original Message -----=20
  From: Stefan Sch=E4fer=20
  To: rsgb_lf_group@blacksheep.org=20
  Cc: Paul=20
  Sent: Friday, November 25, 2011 6:04 PM
  Subject: Re: VLF: 8970 Hz transmissions, soon again here


  Eddie, VLF,=20

  The coil and PA and all the parts are here now and maybe i will do =
first tests tomorrow in the afternoon on 8970 Hz.=20

  The goals would be to resonate on the frequency and apply 50 kV rms or =
more. Oh i just calculated: My coil has about 550 mH and the antenna 473 =
pF. So i need about 100 pF from somewhere else, remembering my homemade =
plate capacitor with the cola bottles as the spacing insolator ;-) The =
coil has about 320 Ohm DC resistance and if i actually want to apply 50 =
kV, i would need 1.2 kW for that. No problem for the PA i think. The ERP =
will be below 1 mW anyway :-(

  But the background noise is extremely low in the last time and if i =
can a stable signal over several hours i expect to be visible in many =
spectrograms.

  73, Stefan/DK7FC

  Am 15.11.2011 22:35, schrieb qrss:=20
    Stefan

    I look forward to your tests, please try and give me a warning even =
for the spontaneous tests so I can leave my Grabber, =
http://g3zjo.bplaced.net , on overnight if needed. Also, due to lack of =
sunshine on the solar panel here, I have been running a dirty earth =
supply to charge the battery, during tests I can remove this for cleaner =
signals.

    73 Eddie G3ZJO


    On 15/11/2011 20:09, Stefan Sch=E4fer wrote:=20
      VLF,

      Am 15.11.2011 17:03, schrieb DENNIS EASTERLING:=20
        [...] I also have a mini-whip, but this has been extended for
        VLF purposes. [...]

      ...which is good since soon there will be some activity again on =
8970 Hz. If you like you can join in to the group of successful =
listeners on the 33 km band.=20

      Yesterday i carried my TX coil to the fixed antenna here. Also the =
PA and variometer part of course. I do inted to use the fixed antenna.
      I did some calculations about the radiation resistance and losses =
and power at maximum voltage (50 kV rms on the wire) and found that the =
ERP will be about 10 dB higher than expected, i.e. i could radiate =
something in the range of many 100 uW up to 1 mW or theoretically up to =
2 mW. We will see and measure.=20

      Paul Nicholsen reported about a very senistive receiver in USA =
that allows long time integration, i.e. not producing a spectrogram but =
integrating a given TX time into a single bin, like Paul usually does.=20
      Here on the fixed antenna i could do night transmissions. 500W TX =
power key down for 24h is no problem (as long as there is no rain).

      So i am optimistic and looking forward to some new work on the =
dreamers band!=20

      Also i would be interested if there is (still) some interest in =
VLF in this group. For Paul, a endless straight "carrier" would be the =
optimium while a radio amateur may like to have some true ID and maybe a =
message to be read and displayed. What about the grabber runners and new =
prepared VLF receiving stations?

      Probably i will start next week but may do some spontaneous tests =
before...

      73, Stefan/DK7FC

      PS: I would like to see other VLF transmitting stations as well. =
What about G3XIZ, DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could =
leave some common traces again in the excellent dark spectrogram =
backgrounds!






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<DIV><FONT face=3DArial>Stefan</FONT></DIV>
<DIV><FONT face=3DArial>If I can hear/see your signal I will call on =
7033 Khz with=20
a report and you can reply on 8970. I will let you know what speed I can =
receive=20
you at. I will increase speed until you disappear. </FONT></DIV>
<DIV><FONT face=3DArial>For interest to all, 40 metres is excellent at =
present to=20
the USA, W2RE is on CW 7033 at 599, this could be a good sign for MF es =
LF=20
today</FONT></DIV>
<DIV><FONT face=3DArial>de mal/g3kev</FONT></DIV>
<DIV>&nbsp;</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DStefan.Schaefer@iup.uni-heidelberg.de=20
  href=3D"mailto:Stefan.Schaefer@iup.uni-heidelberg.de">Stefan =
Sch=E4fer</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Drsgb_lf_group@blacksheep.org=20
  =
href=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org=
</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A =
title=3Dpaul@abelian.netcom.co.uk=20
  href=3D"mailto:paul@abelian.netcom.co.uk">Paul</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, November 25, 2011 =
6:04=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: VLF: 8970 Hz =
transmissions,=20
  soon again here</DIV>
  <DIV><BR></DIV>Eddie, VLF, <BR><BR>The coil and PA and all the parts =
are here=20
  now and maybe i will do first tests tomorrow in the afternoon on 8970 =
Hz.=20
  <BR><BR>The goals would be to resonate on the frequency and apply 50 =
kV rms or=20
  more. Oh i just calculated: My coil has about 550 mH and the antenna =
473 pF.=20
  So i need about 100 pF from somewhere else, remembering my homemade =
plate=20
  capacitor with the cola bottles as the spacing insolator ;-) The coil =
has=20
  about 320 Ohm DC resistance and if i actually want to apply 50 kV, i =
would=20
  need 1.2 kW for that. No problem for the PA i think. The ERP will be =
below 1=20
  mW anyway :-(<BR><BR>But the background noise is extremely low in the =
last=20
  time and if i can a stable signal over several hours i expect to be =
visible in=20
  many spectrograms.<BR><BR>73, Stefan/DK7FC<BR><BR>Am 15.11.2011 22:35, =
schrieb=20
  qrss:=20
  <BLOCKQUOTE cite=3Dmid:4EC2DB14.9000807@talktalk.net=20
    type=3D"cite">Stefan<BR><BR>I look forward to your tests, please try =
and give=20
    me a warning even for the spontaneous tests so I can leave my =
Grabber, <A=20
    class=3Dmoz-txt-link-freetext href=3D"http://g3zjo.bplaced.net"=20
    moz-do-not-send=3D"true">http://g3zjo.bplaced.net</A> , on overnight =
if=20
    needed. Also, due to lack of sunshine on the solar panel here, I =
have been=20
    running a dirty earth supply to charge the battery, during tests I =
can=20
    remove this for cleaner signals.<BR><BR>73 Eddie G3ZJO<BR><BR><BR>On =

    15/11/2011 20:09, Stefan Sch=E4fer wrote:=20
    <BLOCKQUOTE cite=3Dmid:4EC2C6EB.2080201@iup.uni-heidelberg.de=20
      type=3D"cite">VLF,<BR><BR>Am 15.11.2011 17:03, schrieb DENNIS =
EASTERLING:=20
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        <DIV><FONT face=3DArial>[...] I also have a mini-whip, but this =
has been=20
        extended for</FONT></DIV>
        <DIV><FONT face=3DArial>VLF purposes.=20
      [...]</FONT></DIV></BLOCKQUOTE><BR>...which is good since soon =
there will=20
      be some activity again on 8970 Hz. If you like you can join in to =
the=20
      group of successful listeners on the 33 km band. <BR><BR>Yesterday =
i=20
      carried my TX coil to the fixed antenna here. Also the PA and =
variometer=20
      part of course. I do inted to use the fixed antenna.<BR>I did some =

      calculations about the radiation resistance and losses and power =
at=20
      maximum voltage (50 kV rms on the wire) and found that the ERP =
will be=20
      about 10 dB higher than expected, i.e. i could radiate something =
in the=20
      range of many 100 uW up to 1 mW or theoretically up to 2 mW. We =
will see=20
      and measure. <BR><BR>Paul Nicholsen reported about a very =
senistive=20
      receiver in USA that allows long time integration, i.e. not =
producing a=20
      spectrogram but integrating a given TX time into a single bin, =
like Paul=20
      usually does. <BR>Here on the fixed antenna i could do night=20
      transmissions. 500W TX power key down for 24h is no problem (as =
long as=20
      there is no rain).<BR><BR>So i am optimistic and looking forward =
to some=20
      new work on the dreamers band! <BR><BR>Also i would be interested =
if there=20
      is (still) some interest in VLF in this group. For Paul, a endless =

      straight "carrier" would be the optimium while a radio amateur may =
like to=20
      have some true ID and maybe a message to be read and displayed. =
What about=20
      the grabber runners and new prepared VLF receiving=20
      stations?<BR><BR>Probably i will start next week but may do some=20
      spontaneous tests before...<BR><BR>73, Stefan/DK7FC<BR><BR>PS: I =
would=20
      like to see other VLF transmitting stations as well. What about =
G3XIZ,=20
      DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could leave some =
common=20
      traces again in the excellent dark spectrogram=20
    =
backgrounds!<BR><BR><BR></BLOCKQUOTE><BR></BLOCKQUOTE></BLOCKQUOTE></BODY=
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