[cma-l] AM community radio

[Ian Hickling]

If only it were as simple as that!
I must admit that I hadn't looked at it like that - 531 to 1,611 kHz gives a quarter wave range of of 141 metres to 46 metres - yes - three to one!But do you fancy buying/siting/building even a 46m guyed vertical radiator - 152 feet high?
Apparently there are only 9 AM frequencies that Ofcom feels able to allocate to LP operation - I'll see if I can find out what they are.

Ian Hickling
Partner

Office: 01635 578435  (7am-11pm UK time)Carphone: 07530 980115 (only responds when driving)6 Horn Street, Compton, NEWBURY, RG20 6QS

Date: Wed, 16 Sep 2015 21:28:28 +0100
From: tlr at gairloch.co.uk
To: cma-l at mailman.commedia.org.uk
Subject: Re: [cma-l] AM community radio




    
 Given that the MF AM band covers a 3:1 frequency range, is Ofcom at least able to allocate a frequency at the high end of the band, making any given given aerial design a third the size it would be at the LF end of the band? Just wonderin'!



Alex

On 16 September 2015 at 20:20 Ian Hickling <transplanfm at hotmail.com> wrote:

All perfectly acceptable - but as an experienced  propagation engineer my concern is that any departure from a vertical end-corrected quarter wave radiator operating on a groundplane of at least .55 wavelength diameter, the  energy propagation pattern is uncertain and effectively impossible to either determine or plot.In order to take his order - and his money - I have to give the Client an assurance that he will be able to cover his audience effectively - and that simply isn't possible with a cut-down compensated radiator on a much smaller earth mat.

Ian Hickling
Partner

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