Return-Path: Received: (qmail 23930 invoked from network); 9 Mar 2002 00:05:17 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 9 Mar 2002 00:05:17 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 18093 invoked from network); 9 Mar 2002 00:05:13 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 9 Mar 2002 00:05:13 -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 16jVna-000499-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 09 Mar 2002 01:37:26 +0000 Received: from mail4.messagelabs.com ([212.125.75.12]) by post.thorcom.com with smtp (Exim 3.33 #2) id 16jVnZ-000494-00 for rsgb_lf_group@blacksheep.org; Sat, 09 Mar 2002 01:37:25 +0000 X-VirusChecked: Checked Received: (qmail 3198 invoked from network); 8 Mar 2002 23:59:23 -0000 Received: from merimac.us.gases.boc.com (HELO merimac) (204.149.80.4) by server-9.tower-4.messagelabs.com with SMTP; 8 Mar 2002 23:59:23 -0000 Received: by EXC_WIL04 with Internet Mail Service (5.5.2653.19) id ; Fri, 8 Mar 2002 19:07:18 -0500 Message-ID: From: "Ashlock,William" To: rsgb_lf_group@blacksheep.org Subject: LF: RE: loop Date: Fri, 8 Mar 2002 18:51:06 -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: Mal, >I have now installed a loop each vert leg 50 ft approx x each horiz 105 >ft =5250 sq ft. What are you using for a conductor? >Series feed seems to be popular in the USA and a toroid matching transformer. Works for me! If this is also to be a TX loop I would very much appreciate your feedback on the loop Rac and current that you acheive with this setup. >I use 50 or 70 ohm coax so have to match accordingly for my rx/tx. >So far connected up unresonated, it is poor as expected compared with my >resonant vertical. Yes, very poor. Your loop reactance of ~170 ohms is in series with an Rac for the conductor of ~2 ohms. That's about an 85x loss! For TX at your power levels the resonont capcitors will be the main challenge. At 1w you can use plain old 500v micas. >The loop is located about 50 ft away from the vertical and its >associated ground radial system and because of the close proximity I >might not be able to do a meaninful comparison test. I do not intend to >dismantle the vertical because it works so well. Just disconnect the lead to the transmitter so it is out of resonance. Also, take the loop out of resonance when going back to the vertical. I don't expect much interaction. >I can work and hear all the activity on 136 khz, so apart from some fun I do not need another >antenna. I will resonate it on 136 khz and even with the interaction see how received signals compare. My TX loops work rather poorly as RX loops because they pick up too much house-generated crud. Have fun! 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. *********************************************************************