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From: "John W Gould" <jwgould@iee.org.uk>
To: <rsgb_lf_group@blacksheep.org>
Date: Fri, 2 Mar 2007 17:24:20 -0000
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Subject: LF: RFI from 136kHz transmissions
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In the discussion that I am currently having with Ofcom over the RFI
assessment for 501-504kHz applications, the question has been raised as =
to
whether interference has been noted with nearby neighbours, etc, from =
the
transmissions at 136kHz. The licence allows operation on 136kHz without =
any
RFI assessment. It would be helpful to have honest feedback on this if
anyone has examples to offer. In such cases I would like to know details =
of
the aerial, distance to the neighbour concerned, power into the aerial =
and
approx ERP, and likely cause (if it's other than straight V/m) and cure.

It would also be worthwhile knowing those who have done significant
operating using up to the 1W erp from aerials that are in close =
proximity to
the neighbours, e.g. 5 to 10m or so, and not had any RFI problems.=20

Not sure the best way of doing this, but rather than clog up the =
reflector
with replies it might be best for people to e-mail me directly.=20

I will of course collate the data anonymously; it could make life a bit
easier if I could convince Ofcom that from a practical perspective =
-10dBW at
500kHz isn't going to cause much problem as far as RFI is concerned. Of
course that may be pre-judging the facts!

73 John, G3WKL=20
 RSGB HF Manager

g3wkl@btinternet.com


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<DIV>
<P><FONT size=3D2>In the discussion that I am currently having with =
Ofcom over the=20
RFI assessment for 501-504kHz applications, the question has been raised =
as to=20
whether interference has been noted with nearby neighbours, etc, from =
the=20
transmissions at 136kHz. The licence allows operation on 136kHz without =
any RFI=20
assessment. It would be helpful to have honest feedback on this if =
anyone has=20
examples to offer. In such cases I would like to know details of the =
aerial,=20
distance to the neighbour concerned, power into the aerial and approx =
ERP, and=20
likely cause (if it's other than straight V/m) and cure.</FONT></P>
<P><FONT size=3D2>It would also be worthwhile knowing those who have =
done=20
significant operating using up to the 1W erp from aerials that are in =
close=20
proximity to the neighbours, e.g. 5 to 10m or so, and not had any RFI =
problems.=20
</FONT></P>
<P><FONT size=3D2>Not sure the best way of doing this, but rather than =
clog up the=20
reflector with replies it might be best for people to e-mail me =
directly.=20
</FONT></P>
<P><FONT size=3D2>I will of course collate the data anonymously; it =
could make=20
life a bit easier if I could convince Ofcom that from a practical =
perspective=20
-10dBW at 500kHz isn't going to cause much problem as far as RFI is =
concerned.=20
Of course that may be pre-judging the facts!</FONT></P>
<P><FONT size=3D2>73 John, G3WKL<SPAN class=3D205162217-02032007><FONT =
face=3DArial=20
color=3D#0000ff>&nbsp;<BR>&nbsp;</FONT></SPAN>RSGB HF Manager</FONT></P>
<P><FONT size=3D2>g3wkl@btinternet.com</FONT></P></DIV></BODY></HTML>

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