Message-ID: <4CC7BDBA.7040105@xtra.co.nz>
Date: Wed, 27 Oct 2010 18:50:50 +1300
From: ZL2AFP <zl2afp@xtra.co.nz>
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To: rsgb_lf_group@blacksheep.org
CC: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
References: <4CC74304.3090903@iup.uni-heidelberg.de> <AANLkTi=VuSjXZRSs1focCWYVZTYp+0rCj8uxUv=v5MGc@mail.gmail.com> <4CC74C5E.9030203@iup.uni-heidelberg.de>
In-Reply-To: <4CC74C5E.9030203@iup.uni-heidelberg.de>
Subject: Re: VLF: whistler duct AMATEUR propagation
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  I will certainly be on the look out for any such signals. My active=20
antenna starts to roll off below 10kHz so sensitivity will be down a bit=
=20
but it is good for anything above 10kHz.

I am in the suburbs of a city (Wellington) and have a 1000sq.m section,=20
with the active antenna away from other houses, but I still get some=20
minor QRM from time to time.

This would be real DX if it could be accomplished!

73
Con

On 27/10/2010 10:47 a.m., Stefan Sch=E4fer wrote:
> Hi Roger,
>
> Am 26.10.2010 23:18, schrieb Roger Lapthorn:
>> Stefan,
>>
>> The possibility of whistler duct AMATEUR propagation is fascinating.=20
>> There are (I think) spectrograms of such propagation from NAA=20
>> (~14kHz) back in the 1965 book "Whistlers and Related Ionospheric=20
>> Phenomena" by J.A.Hellliwell (I have a copy). This could mean signals=
=20
>> getting to, for example, conjugate locations in the southern=20
>> hemisphere (S.Africa?) with relatively low attenuation. A chirped=20
>> signal would also show whisper dispersion I guess.
> Yes, absolutely interesting! We will do that! And SpecLab can easily=20
> generate such a signal, my PA can easily transmit such a signal and my=
=20
> earth antenna can easily radiate such a (broad band) signal! :-)
>
> Any further hints/ideas, Roger (and the group)?
>>
>> You will need some grabbers in distant places!
> Maybe ZL2AFP can help us here by receiving? :-)
>
> 73, Stefan
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.449 / Virus Database: 271.1.1/3220 - Release Date: 10/26/10=
 06:34:00
>

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    I will certainly be on the look out for any such signals. My active
    antenna starts to roll off below 10kHz so sensitivity will be down a
    bit but it is good for anything above 10kHz.<br>
    <br>
    I am in the suburbs of a city (Wellington) and have a 1000sq.m
    section, with the active antenna away from other houses, but I still
    get some minor QRM from time to time.<br>
    <br>
    This would be real DX if it could be accomplished!<br>
    <br>
    73<br>
    Con<br>
    <br>
    On 27/10/2010 10:47 a.m., Stefan Sch&auml;fer wrote:
    <blockquote cite="mid:4CC74C5E.9030203@iup.uni-heidelberg.de"        type="cite">Hi Roger,
      <br>
      <br>
      Am 26.10.2010 23:18, schrieb Roger Lapthorn:
      <br>
      <blockquote type="cite">Stefan,
        <br>
        <br>
        The possibility of whistler duct AMATEUR propagation is
        fascinating. There are (I think) spectrograms of such
        propagation from NAA (~14kHz) back in the 1965 book "Whistlers
        and Related Ionospheric Phenomena" by J.A.Hellliwell (I have a
        copy). This could mean signals getting to, for example,
        conjugate locations in the southern hemisphere (S.Africa?) with
        relatively low attenuation. A chirped signal would also show
        whisper dispersion I guess.
        <br>
      </blockquote>
      Yes, absolutely interesting! We will do that! And SpecLab can
      easily generate such a signal, my PA can easily transmit such a
      signal and my earth antenna can easily radiate such a (broad band)
      signal! :-)
      <br>
      <br>
      Any further hints/ideas, Roger (and the group)?
      <br>
      <blockquote type="cite">
        <br>
        You will need some grabbers in distant places!
        <br>
      </blockquote>
      Maybe ZL2AFP can help us here by receiving? :-)
      <br>
      <br>
      73, Stefan
      <br>
      <pre wrap="">
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No virus found in this incoming message.
Checked by AVG - <a class="moz-txt-link-abbreviated" href="http://www.avg.com">www.avg.com</a> 
Version: 8.5.449 / Virus Database: 271.1.1/3220 - Release Date: 10/26/10 06:34:00

</pre>
    </blockquote>
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