Return-Path: Received: (qmail 12277 invoked from network); 16 Mar 2002 20:51:32 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 16 Mar 2002 20:51:32 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 23248 invoked from network); 16 Mar 2002 20:51:30 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 16 Mar 2002 20:51:30 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16mMZq-0001nN-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 16 Mar 2002 22:23:02 +0000 Received: from mail4.messagelabs.com ([212.125.75.12]) by post.thorcom.com with smtp (Exim 3.33 #2) id 16mMZp-0001mM-00 for rsgb_lf_group@blacksheep.org; Sat, 16 Mar 2002 22:23:01 +0000 X-VirusChecked: Checked Received: (qmail 17668 invoked from network); 16 Mar 2002 20:41:13 -0000 Received: from merimac.us.gases.boc.com (HELO merimac) (204.149.80.4) by server-20.tower-4.messagelabs.com with SMTP; 16 Mar 2002 20:41:13 -0000 Received: by EXC_WIL04 with Internet Mail Service (5.5.2653.19) id ; Sat, 16 Mar 2002 15:49:01 -0500 Message-ID: From: "Ashlock,William" To: rsgb_lf_group@blacksheep.org Subject: LF: TX Loop antenna conductors Date: Sat, 16 Mar 2002 15:32:42 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: All, I get a bit perturbed when I see comparisons of various loop conductors using Rdc values since the 'skin effect' within the conductors causes the Rac to be much higher at the frequencies we use. To prove the point, I calculated the 'skin effect' of two different loop conductors. For #12 (2.05mm) at 185k the Rac/Rdc came out to 3 and for #8 (3.26mm) the Rac/Rdc was 5. Even though the Rdc for #8 is over 2.5 times lower than #12 for the same length, the Rac is only about 35% lower. This amounts to a mere 2.6db signal improvement, assuming no soil loss. With typical soil loss factored in, the signal improvement would be less than 2.2 db. Bill A ********************************************************************* This footnote confirms that this e-mail message has been scanned for the presence of known computer viruses by the MessageLabs Virus Control Centre. However, it is still recommended that you use local virus scanning software to monitor for the presence of viruses. *********************************************************************