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<div class="moz-cite-prefix">Hello Ian,<br>
<br>
Briefly, protection ratios: Italy has in the past been fairly
unregulated let us say, however, they do appear to have a very
large number of stations on band 2. So far as I can tell from the
available info, there are some city sites at high power with what
looks like around 40+ db co-channel protection (which broadly
seems to comply with ITU-R BS 412-9) with a much larger number at
low power sharing the channel at greater distances. Question:
What rule has been revised here? CR sub band: Have a look at
87.7 I think they are all long term RSLs. This is in effect a CR
sub-band already.<br>
<br>
Regards, Tony Bailey<br>
<br>
On 25/09/14 12:51, Ian Hickling wrote:<br>
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<div dir="ltr">To me the problem is very simple - the archaic
rules that govern potential interference on VHF/FM services need
to be revised.
<div>CR will not get - and doesn't need - its own Band II
sector.</div>
<div>There are 204 channels available virtually everywhere -
there is plenty of room for everyone.</div>
<div>Italy as one case alone has proved this.<br>
<br>
<div>
<hr id="stopSpelling">Date: Thu, 25 Sep 2014 09:43:17 +0100<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:ravensound@pilgrimsound.co.uk">ravensound@pilgrimsound.co.uk</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a><br>
Subject: Re: [cma-l] Community Radio on AM<br>
<br>
<div class="ecxmoz-cite-prefix">From an AM perspective, the
old steam radio has been there and done most of this -
sharing channels, synchronised oscillators - jamming -
offset carriers you name it, all to try to overcome the
limitations of the spectrum. If you have super expensive
receivers it helps, the problem with that is we
increasingly don't have that option. At least with a
ferrite rod antenna you could null out (even jamming) the
unwanted station. There is also the strategic need to
limit competition - once again AM has been there: it was
strongly argued for years that there was no room on the
medium wave band for commercial radio!<br>
<br>
I don't believe you will get anywhere with this until the
community has it's own slice of the cake in band 2 (as do
the BBC and ILR in principle). It has long been accepted
that low power radio should have a separate allocation.
As I understand it, there are now ways to reduce the 2.2
MHz national network slot, doing this with all five would
release two chunks for CR. Surely there is an argument
that if the nationals are not going to move to DAB yet,
they are squatters?<br>
<br>
Regards, Tony Bailey<br>
<br>
On 25/09/14 08:23, Ian Hickling wrote:<br>
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<div dir="ltr">I don't agree that ".....proper
computerised tools are needed to do it properly" Glyn -
sorry.
<div>Computerised tools have got us into the farce that
we are currently in.</div>
<div>Certainly we need proper planning - but after that
we need practical onsite trials as you say with
measurement and analysis.</div>
<div>This however is costly in terms of the equipment
and manpower which Ofcom does not have available and
is not going to get funded by HMG.</div>
<div>So Ofcom <b>could</b> do it but won't.<br>
Lots of us <b>can</b> do it - but Ofcom doesn't
accept that concept.<br>
<br>
<div>
<hr id="ecxstopSpelling">From: <a
moz-do-not-send="true"
class="ecxmoz-txt-link-abbreviated"
href="mailto:tlr@gairloch.co.uk">tlr@gairloch.co.uk</a><br>
To: <a moz-do-not-send="true"
class="ecxmoz-txt-link-abbreviated"
href="mailto:info@a-bc.co.uk">info@a-bc.co.uk</a><br>
Date: Wed, 24 Sep 2014 18:11:01 +0100<br>
CC: <a moz-do-not-send="true"
class="ecxmoz-txt-link-abbreviated"
href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a><br>
Subject: Re: [cma-l] Community Radio on AM<br>
<br>
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<div><font face="Calibri" size="2">I understand the
'complex scientific' side of it, but I still
don't honestly see how the map helps give any
insight other than in the crudest measure of
overall density of stations. </font></div>
<div> </div>
<div><font face="Calibri" size="2">It shows the
general density of stations and is a nice tool
for browsing stations and frequencies, but it
gives no visual representation whatever of
frequencies or powers, so I don't honestly see
how it gives even the vaguest insight into the
interference landscape for a station.</font></div>
<div> </div>
<div><font face="Calibri" size="2">It could maybe
take useful steps in that direction with some
development. For example if one could select a
frequency or transmitter of interest and set a
filter to show only stations of that frequency,
or of that frequency plus adjacent and/or image
channels it would start to give an idea of
potential for interference. Combined with
perhaps a crude free space range
indication using semi-transparent overlays based
on on powers and direction templayes it might
beging to give a rough feel for the interference
landscape for a given station. But as it stands
I don't see how it does that in the slightest.</font></div>
<div> </div>
<div><font face="Calibri" size="2">Not meaning to be
picky, honest - I like it for what it is, and it
does give a feel for the geographic distribution
of CR stations, but it doesn't seem to me
to offer any useful insight or even vague feel
for the interference landscape.</font></div>
<div><font face="Calibri" size="2"><br>
Alex</font></div>
<br>
</div>
</div>
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