I'm told that the Anthorn Tx runs 50 KW RF output to a 'T' antenna with a radiated power of 17 KW. Unfortunately, I'm not sure of the height of the supporting antenna masts but Wikipedia says that they are 227 metres (745 ft) tall.

Hope that helps.

Ian G4EXD

On 18/10/2017 16:10, John Rabson wrote:

Can anyone help David Gibson?

John F5VLF

-------- Forwarded Message --------

Subject:	efficiency of long wave transmitters
Date:	Wed, 18 Oct 2017 13:54:36 +0100
From:	David Gibson <[email protected]>
To:	Mike Bedford <[email protected]>, Rob Gill <[email protected]>, [email protected], [email protected]

Mike, Rob, John, Chris...

This is me just being lazy and trying to avoid doing a web search, or
ploughing through Watt's book on VLF Engineering.  Do any of you have a
reference to a *definitive* statement of the transmitter efficiency of
the 60kHz Anthorn transmitter and the 198kHz BBC R4 Droitwich transmitter?

-- 
David Gibson