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Date: Wed, 15 Feb 2012 21:45:10 +0000
Message-ID: <CAA8k23RZxN9vCFMLLQpX9yXphDx3FHDqzP6Jh=6sA-2BkxpoDg@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: WRC-12 Approves the New 472-479 kHz Amateur Radio Allocation
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But what is interference?
If none is reported, none is caused.

And who is going to report interference to a service no one uses

'Andy
www.g4jnt.com




On 15 February 2012 21:40, Clemens Paul <cpaul@gmx.net> wrote:

> Greetings all,
>
> I wonder what "secondary user on non-interference basis" means in practice.
> As we know most NDBs are AM modulated with about 1kHz.
> Now it would be interesting to know what selectivity/bandwidth DF receivers
> for NDBs in aeroplanes might have.
> Imagine they have 1kHz or even 2kHz (quite possible).
> For non interfering such a receiver one would have to stay well without
> that
> BW.
> Hence with a few NDBs spread between 422 and 479kHz there would
> virtually remain no usable frequency for us amateurs if we wanted to make
> 100% sure not to interfere any aeroplanes' beacon reception.
>
> 73
> Clemens
> DL4RAJ
>
>
>

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<div>But what is interference?=A0=A0 </div>
<div>If none is reported, none is caused.</div>
<div>=A0</div>
<div>And who is going to report interference to a service no one uses</div>
<div>=A0</div>
<div>&#39;Andy</div>
<div><a href=3D"http://www.g4jnt.com/">www.g4jnt.com</a></div>
<div>=A0</div>
<div><br><br>=A0</div>
<div class=3D"gmail_quote">On 15 February 2012 21:40, Clemens Paul <span di=
r=3D"ltr">&lt;<a href=3D"mailto:cpaul@gmx.net">cpaul@gmx.net</a>&gt;</span>=
 wrote:<br>
<blockquote style=3D"BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PA=
DDING-LEFT:1ex" class=3D"gmail_quote">Greetings all,<br><br>I wonder what &=
quot;secondary user on non-interference basis&quot; means in practice.<br>
As we know most NDBs are AM modulated with about 1kHz.<br>Now it would be i=
nteresting to know what selectivity/bandwidth DF receivers<br>for NDBs in a=
eroplanes might have.<br>Imagine they have 1kHz or even 2kHz (quite possibl=
e).<br>
For non interfering such a receiver one would have to stay well without tha=
t<br>BW.<br>Hence with a few NDBs spread between 422 and 479kHz there would=
<br>virtually remain no usable frequency for us amateurs if we wanted to ma=
ke<br>
100% sure not to interfere any aeroplanes&#39; beacon reception.<br><br>73<=
br>Clemens<br>DL4RAJ<br><br><br></blockquote></div><br>

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