[cma-l] Funky SX and the Lille tranmitter

[Two Lochs Radio]

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 
  To: The Community Media Association Discussion List 
  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



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