[cma-l] Funky SX and the Lille tranmitter

[Associated Broadcast Consultants]

Yes Alex - I remember reading somewhere that although it had frequency
clearance for 400kW, a lesser power is used.   But for frequency planning
purposes, Ofcom would have to assume worst case.

Glyn

-- 
Glyn Roylance - Principal Consultant
Associated Broadcast Consultants <http://www.a-bc.co.uk/>
<http://www.a-bc.co.uk/index.html>



On 30 July 2015 at 10:59, Two Lochs Radio <tlr at gairloch.co.uk> wrote:

> Just out of interest, we have a 2kW relay on 106.6FM and in the past its
> signal has been swamped in places by the signal from Radio Estel in
> Barcelona, strongly enough that an RDS receiver on the fringe of our
> station's coverage where it doesn't normally show a reliable RDS display
> was happily showing the R Estel id (which is how we identified the
> station). This was of course during a period of high pressue sporadic
> propagation, but it lasted on and off for several hours, but was from a
> transmitter of just 20kW a cool 1,900km away!
>
> We also get fringe adjacent channel interference from Classic FM on
> 101.9FM in Northern Ireland. Not sporadic propagation this time, but fairly
> regular positional reception - the Classic FM transmitter is a more modest
> 345km away, but with around 200kW erp in our direction from a site 366m
> ASL!
>
> Alex
>
> PS I wonder which power Ofcom was using to calculate likely interference
> from the Lille transmitter - despite what MDS975 says, four of the services
> are actually listed  as 126kW max, and 32-40kW in the direction of Essex
> though that's only 5-6dB less. The horizontal polarization should
> effectively lose several more dB. Tellingly, the same frequencies are
> re-used in France at much closer range than Essex!  France Info on 105.2MHz
> is at about double those powers, but again restricted in the direction of
> the UK. Oresumably Ofcom has definitive versions of all this info.
>
>
>
> ----- Original Message -----
> *From:* Associated Broadcast Consultants <info at a-bc.co.uk>
> *To:* The Community Media Association Discussion List
> <cma-l at mailman.commedia.org.uk>
> *Sent:* Thursday, July 30, 2015 9:54 AM
> *Subject:* [cma-l] Funky SX and the Lille tranmitter
>
>
>
> Ian said:
>
> *We saw how a CR station in Southend on the cleared "vacant" frequency
> would not interfere with any existing broadcaster, but could seriously
> suffer from incoming interference in sporadic tropospheric propagation
> conditions from a 4kW station in northern France*
>
>
> In fact it is ....*400kW* - yikes!  Info here:
> http://www.mds975.co.uk/masts/bouvigny.html  It is horizontally polarised
> which may help mitigate it a bit.
>
>
> Glyn
>
> --
> Glyn Roylance - Principal Consultant
> Associated Broadcast Consultants <http://www.a-bc.co.uk/>
> <http://www.a-bc.co.uk/index.html>
>
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-- 
Glyn Roylance - Principal Consultant
Associated Broadcast Consultants <http://www.a-bc.co.uk/>
<http://www.a-bc.co.uk/index.html>
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