[cma-l] AM community radio

[Two Lochs Radio]

PS: Regarding the 3:1 argument I think the extra antenna efficiency/small size may well be offset (possibly more than offset) by the propagation advantage of the lower frequency.  Laser did not choose 558kHz by accident.

Maybe true, but in many cases I suspect it might be much easier to raise the EMRP to compensate for that, rather than erect a mast three times as high!

Alex


  ----- Original Message ----- 
  From: Associated Broadcast Consultants 
  To: The Community Media Association Discussion List 
  Sent: Friday, September 18, 2015 8:54 AM
  Subject: Re: [cma-l] AM community radio


  Just a thought possibly for a low cost antenna system...


  When I was a student many moons ago in Manchester, Radio Rag used to operate their AM transmitter from the student halls tower block I lived in.   I don't know what you'd call it, but I guess it was an inverted monopole.   100W transmitter up on the 12th floor feeding into a near vertical wire radiator down to ground level.


  Obviously if circularity in coverage is important that might be a problem (but I don't recall the signal was that strongly impacted behind the building).  But if your local council are obliging it might be a way to get a reasonably efficient antenna quite cheaply.


  Glyn


  PS: Regarding the 3:1 argument I think the extra antenna efficiency/small size may well be offset (possibly more than offset) by the propagation advantage of the lower frequency.  Laser did not choose 558kHz by accident.



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