[cma-l] DCMS consultation meetings on amendments to communityradio law

[Two Lochs Radio]

I would second that.

I don't think anyone would be likely to notice the effects of doubling or even quadrupling power in typical circumstances, but it will improve the noise and interference margin, so improving the signal quality across a wider range of propagation conditions. 

Finding a good elevated aerial position for your intended patch can be far more productive, and although it may mean more intial work or capital expense, once done it is likely to cost no more in upkeep than a poorly sited antenna, while even saving you the extra electricity that a more powerful transmitter would have taken!

For maintenance or repair we have on occasion reduced our 600W erp to 40W - a fifteen-fold reduction - and it is remarkable how small a difference it makes to coverage and reception quality (although in adverse conditions it would definitely show up). We lose coverage of one small settlement, and get more in-car 'flicker' in some parts of the patch, but the core is relatively unaffected.

However, it's a complex set of interactions, and you really need the use of good propagation prediction software and antenna modelling in the hands of a knowledgeable operator to predict the likely cost benefits of increased Tx power versus antenna design and siting. (Cue Ian?!)

Alex


  ----- Original Message ----- 
  From: Associated Broadcast Consultants 
  To: CMA-L 
  Sent: Monday, October 17, 2011 9:08 AM
  Subject: Re: [cma-l] DCMS consultation meetings on amendments to communityradio law


  Regardless, transmitter power probably makes a lot less difference than people expect - even if you doubled the power it would probably be difficult for most people to tell the difference in a blind test. (If I'm honest with myself I don't think I could tell with just a radio to judge).


  The biggest impact on coverage (positive or negative) is transmitter (aerial) position  - which could easily double (or halve) your coverage depending whether it is a good or bad position. 


  If you have coverage problems, having ruled-out faults, the path of least resistance first of all is to look at your transmitter site, and see if there could be a better location. If your transmitter is at your studio, then STL's (Studio Transmitter Links) might not cost as much as you think and they give you much more freedom over this important variable.


  I think there are bigger impediments to CR than licenced transmitter power!


  Glyn Roylance
  www.a-bc.co.uk

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