[cma-l] Funky SX and the Lille tranmitter

[vwradio at aol.com]

When we get stations coming in strongly from places like Spain - that's usually caused by sporadic-E. It's a phenomenon where signals bounce off ionized clouds and can last minutes or just seconds. Last month I heard a station from Morocco on FM stronger than our local Heart in Dorset sitting in my car. This is different from the tropospheric effect where French stations start coming in loud and clear. Works both ways though - we got a report of being heard in Sweden on 92.3 via sporadic E.


The wonders of radio propogation. Nothing you can do about it.



Steve


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-----Original Message-----
From: Two Lochs Radio <tlr at gairloch.co.uk>
To: The Community Media Association Discussion List <cma-l at mailman.commedia.org.uk>
Sent: Thu, 30 Jul 2015 11:09
Subject: Re: [cma-l] Funky SX and the Lille tranmitter


     
  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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