Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mh06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3856038000093; Sun, 14 Aug 2011 13:08:04 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Qse9H-0008Ag-B9 for rs_out_1@blacksheep.org; Sun, 14 Aug 2011 18:06:55 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Qse9G-0008AX-MO for rsgb_lf_group@blacksheep.org; Sun, 14 Aug 2011 18:06:54 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Qse9F-0007xm-HX for rsgb_lf_group@blacksheep.org; Sun, 14 Aug 2011 18:06:54 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id p7EH6qB2016868 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 14 Aug 2011 19:06:52 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id p7EH6qbr004439 for ; Sun, 14 Aug 2011 19:06:52 +0200 Message-ID: <4E47FFE9.10100@iup.uni-heidelberg.de> Date: Sun, 14 Aug 2011 19:03:37 +0200 From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= 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: <68BE37BD69E54DEE89CEBA8E30E9B94E@PcMinto> In-Reply-To: <68BE37BD69E54DEE89CEBA8E30E9B94E@PcMinto> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Re: 137 grabbers Content-Type: multipart/alternative; boundary="------------050109040501060608050401" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.4 required=5.0 tests=HTML_40_50,HTML_MESSAGE, WEIRD_PORT 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:456119584:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60da4e4800f4536d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------050109040501060608050401 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id p7EH6qB2016868 This looks like a very good design. Fascinating easy!! Is it completely=20 grown in your head or have you seen it somewhere in the web? What is the gain, about? I know the BC337 as a low noise NPN transistor. Your loop is 2m diameter? How many dBs is the background noise abovethe=20 soundcard noise? Another question: Why are the T37-43 (the 43 types in general) preferred=20 to the 77 types? The 77 types have a higher AL value and should come out=20 with less turns. I tried to wind a band pass coil with but of the types=20 (T50-43 and T50-77) and achieved about the same Q. Is it just a question=20 of an available distributor? And what is your job? Do you have to design electrical circuits? ;-) 73, Stefan/DK7FC Am 14.08.2011 18:07, schrieb Minto Witteveen: > Loop antenna:=20 > http://www.pa3bca.nl/index.php?option=3Dcom_content&view=3Darticle&id=3D= 10&Itemid=3D14=20 > > *From:* Minto Witteveen > *Sent:* Sunday, August 14, 2011 18:03 > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: 137 grabbers > Mal, LF, > I am now using a single-turn loop in the backyard (hight abt 2 meters)=20 > instead of the miniwhip. > One of these days I will test again with the miniwhip. First=20 > impression (testing the noise against DCF39) was that they dont differ=20 > very much. > 73=E2=80=99s Minto pa3bca (grabber at http://pa3bca.pa3bca.nl:8181) > -----------------------------------------------------------------------= --- > Ceterum censeo Carthaginem delendam esse > *From:* mal hamilton > *Sent:* Sunday, August 14, 2011 17:51 > *To:* rsgb > *Subject:* LF: 137 grabbers > LF > My signal seems consistant on the PA3PCA grabber but varies a lot on=20 > the DK7FC grabber, sometimes stronger on this grabber and others like=20 > now barely visible. Could it be the type of antenna in use ie one is=20 > more prone to noise es qsb than the other? > de > mal/g3kev --------------050109040501060608050401 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id p7EH6qB2016868 This looks like a very good design. Fascinating easy!! Is it completely grown in your head or have you seen it somewhere in the web?
What is the gain, about? I know the BC337 as a low noise NPN transistor.<= br> Your loop is 2m diameter? How many dBs is the background noise abovethe soundcard noise?

Another question: Why are the T37-43 (the 43 types in general) preferred to the 77 types? The 77 types have a higher AL value and should come out with less turns. I tried to wind a band pass coil with but of the types (T50-43 and T50-77) and achieved about the same Q. Is it just a question of an available distributor?

And what is your job? Do you have to design electrical circuits? ;-)

73, Stefan/DK7FC




Am 14.08.2011 18:07, schrieb Minto Witteveen:
Sent: Sunday, August 14, 2011 18:03
Subject: Re: LF: 137 grabbers
=C2=A0
Mal, LF,
=C2=A0
I am now using a single-turn loop in the backyard (hight abt 2 meters) instead of the miniwhip.
One of these days I will test again with the miniwhip. First impression (testing the noise against DCF39) was that they dont differ very much.
=C2=A0
73=E2=80=99s Minto pa3bca (grabber at http://pa3bca.pa3bca.nl:8181) =
=C2=A0
--= ------------------------------------------------------------------------<= br> Ceterum censeo Carthaginem delendam esse
=C2=A0
Sent: Sunday, August 14, 2011 17:51
To: rsgb
Subject: LF: 137 grabbers
=C2=A0
LF
My signal seems consistant on the PA3PCA grabber but varies a lot on the DK7FC grabber, sometimes stronger on this grabber and others like now barely visible. Could it be the type of antenna in use ie one is more prone to noise es qsb than the other?
de
mal/g3kev
--------------050109040501060608050401--