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Date: Fri, 10 Sep 2010 12:54:36 +0200
From: =?windows-1252?Q?Stefan_Sch=E4fer?=
 <schaefer@iup.uni-heidelberg.de>
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Subject: VLF: UK NoVs
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Hello Jim,

Of course i could give you some numbers of calculations. Your described=20
station should not radiate too much power ;-) But maybe Jim/M0BMU is the=
=20
one who can not only do it better but also better verbalized :-)=20
Markus/DF6NM would be the expert from the german site (one of them) but=20
you have enough experts in UK ;-) I don't want to be the one who is=20
guilty if all the UK amateurs wouldn't get the NoV, HI :-)

If you want to have any details from my TX station and radieated power=20
on VLF, i can give you a summary of course :-)

BTW: I have now tapped my VLF TX coil to come back to 8.97 kHz/Dreamers=20
Band with the 200m kite vertical! DC resistance of the coil is now=20
reduced from 323 Ohm to 225 Ohm :-) With proper wind, the signal will=20
reach the 50 mW ERP level which could be suitable for a TA contact if=20
the RX side is well equipped! :-)

73, Stefan/DK7FC


Am 10.09.2010 12:01, schrieb james.cowburn e-mail:
> Hi Stefan
> If you see below, Ofocm have asked me to demosntrate some calculations=
=20
> to show my ERP.  any help on providing a "robust" and "defendable"=20
> response would be appreciated if you can help me.
> I'll be using an inv l antenna 10m/40m fed via a 1.4H coil or perhaps=20
> LOPT.   Tx output will be from an audio amp at 200W running QRSS=20
> across a freq range of say 6khz to 10khz.
> My earth conditions are fair to poor with average soil quality and a=20
> several rods and radials but no great expanse of buried copper.
> could you send me some numbers I can then forward back to Ofcom.
> i'm guessing that with a limited set up such as that the ERP will be=20
> in the nanowatt/femtowatt ranges
> thanks in advance for any help
> with best regards
> jim G7NKS
> Hello James,
>
> As you know we are now progressing the applications for a SRP NoV for=20
> 9kHz and we need a element of clarification concerning yours please.
>
> We have observed what might be an anomaly relating to the calculated=20
> efficiency referred to on the page titled =93Proposals for Site=94. Coul=
d=20
> you please provide us with figures that were used to arrive at the=20
> power levels quoted under ERP?
>
> An early response would be welcomed in order that we can put all of=20
> the 3 current applications to the Met Office as one offering.
>
> Any concerns please let me know.
>
> 73
>
> Rod  (G3TXA)
>
> Rod Wilkinson
> OLC Senior Associate, Amateur Radio
> 020 7783 4488 (direct line)
> Rod.wilkinson@ofcom.org.uk <mailto:Rod.wilkinson@ofcom.org.uk>
>
> Ofcom
> Riverside House
> 2a Southwark Bridge Road
> London SE1 9HA
> 020 7981 3000
> www.ofcom.org.uk <http://www.ofcom.org.uk/>
>
> 2010/9/8 Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de=20
> <mailto:schaefer@iup.uni-heidelberg.de>>
>
>     LF,
>
>     This weekend i saw the first time IK1HSS and RA3YO (disturbed by
>     my own transmission from France) in my QRSS-60 grabber window.
>     Tnx to them for the activity!
>
>     73, Stefan
>
>

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ent-Type">
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</head>
<body bgcolor=3D"#ffffff" text=3D"#000000">
Hello Jim,<br>
<br>
Of course i could give you some numbers of calculations. Your described
station should not radiate too much power ;-) But maybe Jim/M0BMU is
the one who can not only do it better but also better verbalized :-)
Markus/DF6NM would be the expert from the german site (one of them) but
you have enough experts in UK ;-) I don't want to be the one who is
guilty if all the UK amateurs wouldn't get the NoV, HI :-)<br>
<br>
If you want to have any details from my TX station and radieated power
on VLF, i can give you a summary of course :-)<br>
<br>
BTW: I have now tapped my VLF TX coil to come back to 8.97 kHz/Dreamers
Band with the 200m kite vertical! DC resistance of the coil is now
reduced from 323 Ohm to 225 Ohm :-) With proper wind, the signal will
reach the 50 mW ERP level which could be suitable for a TA contact if
the RX side is well equipped! :-)<br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
Am 10.09.2010 12:01, schrieb james.cowburn e-mail:
<blockquote   cite=3D"mid:AANLkTinYj0PCyYWVsX5aXJUotO0y_mypBW1XDauwcTr3@ma=
il.gmail.com"   type=3D"cite">
  <div>Hi Stefan</div>
  <div>=A0</div>
  <div>If you see below, Ofocm have asked me to demosntrate some
calculations to show my ERP.=A0 any help on providing a "robust" and
"defendable" response would be appreciated if you can help me.</div>
  <div>=A0</div>
  <div>I'll be using an inv l antenna 10m/40m fed via a 1.4H coil or
perhaps LOPT.=A0=A0 Tx output will be from an audio amp at 200W running
QRSS across a freq range of say 6khz to 10khz.</div>
  <div>=A0</div>
  <div>My earth conditions are fair to poor with average soil quality
and a several rods and radials but no great expanse of buried copper.</div=
>
  <div>=A0</div>
  <div>could you send me some numbers I can then forward back to Ofcom.</d=
iv>
  <div>=A0</div>
  <div>i'm guessing that with a limited set up such as that the ERP
will be in the nanowatt/femtowatt ranges</div>
  <div>=A0</div>
  <div>thanks in advance for any help</div>
  <div>=A0</div>
  <div>with best regards</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>jim G7NKS</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>=A0</div>
  <div>Hello James,<br>
=A0<br>
As you know we are now progressing the applications for a SRP NoV for
9kHz and we need a element of clarification concerning yours please.<br>
=A0<br>
We have observed what might be an anomaly relating to the calculated
efficiency referred to on the page titled =93Proposals for Site=94. Could
you please provide us with figures that were used to arrive at the
power levels quoted under ERP?<br>
=A0<br>
An early response would be welcomed in order that we can put all of the
3 current applications to the Met Office as one offering.<br>
=A0<br>
Any concerns please let me know.<br>
=A0<br>
73<br>
=A0<br>
Rod=A0 (G3TXA)<br>
=A0<br>
Rod Wilkinson<br>
OLC Senior Associate, Amateur Radio<br>
020 7783 4488 (direct line)<br>
  <a moz-do-not-send=3D"true" href=3D"mailto:Rod.wilkinson@ofcom.org.uk">R=
od.wilkinson@ofcom.org.uk</a><br>
=A0<br>
Ofcom<br>
Riverside House<br>
2a Southwark Bridge Road<br>
London SE1 9HA<br>
020 7981 3000<br>
  <a moz-do-not-send=3D"true" href=3D"http://www.ofcom.org.uk/">www.ofcom.=
org.uk</a><br>
  <br>
  </div>
  <div class=3D"gmail_quote">2010/9/8 Stefan Sch=E4fer <span dir=3D"ltr">&=
lt;<a   moz-do-not-send=3D"true" href=3D"mailto:schaefer@iup.uni-heidelber=
g.de">schaefer@iup.uni-heidelberg.de</a>&gt;</span><br>
  <blockquote class=3D"gmail_quote"   style=3D"border-left: 1px solid rgb(=
204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">LF,<br>
    <br>
This weekend i saw the first time IK1HSS and RA3YO (disturbed by my own
transmission from France) in my QRSS-60 grabber window.<br>
Tnx to them for the activity!<br>
    <br>
73, Stefan<br>
  </blockquote>
  </div>
  <br>
</blockquote>
</body>
</html>

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