Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v9KGEXHn004730 for ; Fri, 20 Oct 2017 18:14:36 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1e5Zov-0005sX-NV for rs_out_1@blacksheep.org; Fri, 20 Oct 2017 17:06:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1e5Zot-0005sO-8L for rsgb_lf_group@blacksheep.org; Fri, 20 Oct 2017 17:06:47 +0100 Received: from mout02.posteo.de ([185.67.36.66]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1e5Zop-0007Un-Vi for rsgb_lf_group@blacksheep.org; Fri, 20 Oct 2017 17:06:45 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id ABD3520A61 for ; Fri, 20 Oct 2017 18:06:40 +0200 (CEST) Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 3yJVzM6TqHz1090 for ; Fri, 20 Oct 2017 18:06:39 +0200 (CEST) Message-ID: <59EA1F0F.8000804@posteo.de> Date: Fri, 20 Oct 2017 18:06:39 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <50fb2ef9-1067-a98e-ad97-502072300286@gmail.com> In-Reply-To: X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Watch this: https://www.youtube.com/watch?v=LSKm2uQGfIA/ 73, Stefan Am 20.10.2017 17:00, schrieb Roger Lapthorn: > Nearly as tall as mine then ;-) > > On 20 October 2017 at 15:03, Ian Marsh > wrote: > > 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 >> To: Mike Bedford , >> Rob Gill >> , creg-enquiries@bcra.org.uk >> , C.Trayner@leeds.ac.uk >> >> >> >> >> 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 >> >> > > [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 860e51ceecdf98b32e8eba101d9d472d Subject: Re: LF: Fwd: efficiency of long wave transmitters Content-Type: multipart/alternative; boundary="------------020808000801030507000007" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_40_50,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,HTML_TITLE_EMPTY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false This is a multi-part message in MIME format. --------------020808000801030507000007 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Watch this: https://www.youtube.com/watch?v=LSKm2uQGfIA/ 73, Stefan Am 20.10.2017 17:00, schrieb Roger Lapthorn: > Nearly as tall as mine then ;-) > > On 20 October 2017 at 15:03, Ian Marsh > wrote: > > 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 >> To: Mike Bedford , >> Rob Gill >> , creg-enquiries@bcra.org.uk >> , C.Trayner@leeds.ac.uk >> >> >> >> >> 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 >> >> > > --------------020808000801030507000007 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Watch this: https://www.youtube.com/watch?v=LSKm2uQGfIA/

73, Stefan

Am 20.10.2017 17:00, schrieb Roger Lapthorn:
Nearly as tall as mine then ;-)

On 20 October 2017 at 15:03, Ian Marsh <ian.g4exd@gmail.com> wrote:
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 <david@caves.org.uk>
To: Mike Bedford <bedfordmd@aol.com>, Rob Gill <creg-editor@bcra.org.uk>, creg-enquiries@bcra.org.uk, C.Trayner@leeds.ac.uk 


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


--------------020808000801030507000007--