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Old 29th Dec 2015, 3:28 pm   #332
Nuvistor
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Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
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Default Re: 405-Line VHF Aerials 2013 to the present day.

I believe the 125kW is a misprint but open to correction.

The transmission was indeed directional with the main lobes north of east and north west with smaller lobes to other compass points. the BBC engineering paper on this aerial states the maximum transmit power was 8.5kw with an mean aerial gain of 6.2 db and a mean ERP of 35kw. The main lobes correspond to around 35kw ERP (see polar diagram). I accept that various areas covered by the transmitter would have different signal strengths but I am not convinced about the 125kW ERP, more like 12.5kw on average.

see http://downloads.bbc.co.uk/rd/pubs/reports/1967-04.pdf

Frank

edit.When I say misprint, I know various information is available that quotes 125kw, I am not denigrating you post Steve

Last edited by Nuvistor; 29th Dec 2015 at 3:36 pm.
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