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References: <E8d711BBdibNFwVq@g4dmp.fsnet.co.uk>
Date: Wed, 2 Mar 2011 15:52:03 +0000
Message-ID: <AANLkTikkRS3S6Cr_fWbu9C67YNT8E=dTgNnD62up3_y3@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: WRC-2012 proposal for 'near' 500kHz band(s)
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I thought IFs in use were common across most of the world with 450, 455 and
470kHz all being used. So, an allocation above 470kHz would be sensible.

Why not try for 472-487kHz the amateur radio service in *every* region? Is
there any logic having two proposals (at least)? Wouldn't the chances of
success at WRC-2012 been higher if there was a common frequency proposal
worldwide for an allocation at MF?

73s
Roger G3XBM


On 2 March 2011 11:17, David Pratt <david@g4dmp.fsnet.co.uk> wrote:

> I was somewhat disturbed by the piece in last Sunday's GB2RS news that
> gave preliminary information about the proposals to WRC-2012 for an
> allocation near to 500kHz.
>
> It states that the initial proposal for 15kHz allocated was between 415
> to 526.5kHz.  Due to future maritime use, the RSGB is proposing
> 472-487kHz, while the US will be proposing two bands totally 15kHz, viz
> 461-469 and 471-478kHz.
>
> I wonder whether any thought has been given to the fact that the IF of
> medium wave broadcast receivers in the UK is usually either 465kHz or
> 470kHz?  In the US the IF is more usually 450kHz or 455kHz.
>
> This being so, any operating particularly at the lower end of 472-487kHz
> is very likely to cause interference to AM broadcast reception.
>
> I recall when I took my Morse test at Portpatrick in 1954. Broadcast
> reception was repeatedly interrupted by GPK operating on 472kHz.
>
> Sorry it this has been covered before. I could have missed it.
>
> 73 de David G4DMP
> --
>  + - - - - - - - - - - - - - - - - +
>  | David M Pratt, Kippax, Leeds.   |
>  | Website: http://www.g4dmp.co.uk |
>  + - - - - - - - - - - - - - - - - +
>
>
>
>
>


-- 
g3xbm-qrp.blogspot.com/
www.g3xbm.co.uk
www.youtube.com/user/g3xbm
<http://vlf_grabber>G3XBM   GQRP 1678    ISWL G11088

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I thought IFs in use were common across most of the world with 450, 455 an=
d 470kHz all being used. So, an allocation above 470kHz would be sensible.=
 <br><br>Why not try for 472-487kHz the amateur radio service in <i>every<=
/i> region? Is there any logic having two proposals (at least)? Wouldn&#39=
;t the chances of success at WRC-2012 been higher if there was a=20
common frequency proposal worldwide for an allocation at MF? <br><br>73s<b=
r>Roger G3XBM<br><br><br><div class=3D"gmail_quote">On 2 March 2011 11:17,=
 David Pratt <span dir=3D"ltr">&lt;<a href=3D"mailto:david@g4dmp.fsnet.co.=
uk">david@g4dmp.fsnet.co.uk</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; bord=
er-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">I was somewhat=
 disturbed by the piece in last Sunday&#39;s GB2RS news that<br>
gave preliminary information about the proposals to WRC-2012 for an<br>
allocation near to 500kHz.<br>
<br>
It states that the initial proposal for 15kHz allocated was between 415<br=
>
to 526.5kHz. =A0Due to future maritime use, the RSGB is proposing<br>
472-487kHz, while the US will be proposing two bands totally 15kHz, viz<br=
>
461-469 and 471-478kHz.<br>
<br>
I wonder whether any thought has been given to the fact that the IF of<br>
medium wave broadcast receivers in the UK is usually either 465kHz or<br>
470kHz? =A0In the US the IF is more usually 450kHz or 455kHz.<br>
<br>
This being so, any operating particularly at the lower end of 472-487kHz<b=
r>
is very likely to cause interference to AM broadcast reception.<br>
<br>
I recall when I took my Morse test at Portpatrick in 1954. Broadcast<br>
reception was repeatedly interrupted by GPK operating on 472kHz.<br>
<br>
Sorry it this has been covered before. I could have missed it.<br>
<br>
73 de David G4DMP<br>
<font color=3D"#888888">--<br>
=A0+ - - - - - - - - - - - - - - - - +<br>
=A0| David M Pratt, Kippax, Leeds. =A0 |<br>
=A0| Website: <a href=3D"http://www.g4dmp.co.uk" target=3D"_blank">http://=
www.g4dmp.co.uk</a> |<br>
=A0+ - - - - - - - - - - - - - - - - +<br>
<br>
<br>
<br>
<br>
</font></blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http=
://g3xbm-qrp.blogspot.com/" target=3D"_blank">g3xbm-qrp.blogspot.com/</a><=
br><a href=3D"http://www.g3xbm.co.uk" target=3D"_blank">www.g3xbm.co.uk</a=
><br><a href=3D"http://www.youtube.com/user/g3xbm" target=3D"_blank">www.y=
outube.com/user/g3xbm</a><br>
<a href=3D"http://vlf_grabber" target=3D"_blank"></a>G3XBM=A0=A0 GQRP 1678=
=A0=A0=A0 ISWL G11088<br>

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