Return-Path: Received: from mtain-de10.r1000.mx.aol.com (mtain-de10.r1000.mx.aol.com [172.29.64.210]) by air-de03.mail.aol.com (v129.4) with ESMTP id MAILINDE032-5eab4bffeb8827a; Fri, 28 May 2010 12:12:57 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-de10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3DD2B38004743; Fri, 28 May 2010 12:12:55 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OI29S-0000PJ-SK for rs_out_1@blacksheep.org; Fri, 28 May 2010 17:11:14 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OI29S-0000PA-Er for rsgb_lf_group@blacksheep.org; Fri, 28 May 2010 17:11:14 +0100 Received: from fmmailgate04.web.de ([217.72.192.242]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OI29Q-0001sA-Mu for rsgb_lf_group@blacksheep.org; Fri, 28 May 2010 17:11:14 +0100 Received: from mwmweb035 ( [172.20.18.44]) by fmmailgate04.web.de (Postfix) with ESMTP id 32D796760697 for ; Fri, 28 May 2010 18:11:07 +0200 (CEST) Received: from [88.76.62.189] by mwmweb035 with HTTP; Fri May 28 18:11:07 CEST 2010 Date: Fri, 28 May 2010 18:11:07 +0200 (CEST) From: =?ISO-8859-15?Q?Horst_St=F6cker?= To: rsgb_lf_group@blacksheep.org In-Reply-To: Message-ID: <1344257766.4243506.1275063067203.JavaMail.fmail@mwmweb035> References: <38A51B74B884D74083D7950AD0DD85E82A1C00@File-Server-HST.hst.e-technik.tu-darmstadt.de> , MIME-Version: 1.0 X-UI-Message-Type: mail X-UI-ATTACHMENT-ID-POSTFIX: 83519347-c792-4c60-89c0-8e04eb566b03 X-Priority: 3 Importance: normal Sensitivity: Normal X-Provags-ID: V01U2FsdGVkX1/O4/yQWkh6GBQtfxZk7YW9h6YidVMOQBSU/k7JFIHfz3Q6d9njY4nK d9ozZqoLYe8rvxxIPZQ4Uolx9pY7DVde6bxI+/kcZD06yQPM9IwHnA== X-Spam-Score: 2.4 (++) X-Spam-Report: autolearn=disabled,HTML_10_20=0.945,HTML_IMAGE_ONLY_24=0.93,HTML_MESSAGE=0.001,HTML_MIME_NO_HTML_TAG=0.512,MIME_HTML_ONLY=0.001 Subject: LF: 8.97kHz - Near field test by ear: The "human factor" Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.6 required=5.0 tests=HTML_MESSAGE, HTML_MIME_NO_HTML_TAG,MIME_HTML_ONLY,PRIORITY_NO_NAME 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-sid: 3039ac1d40d24bffeb877bb8 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello dreamers

Unbelievable: 400m at by ear reception wit= h only 4 Watt and a small earth base? At my QTH at city environment my 30m= earth base at about 300 W did not work. At my T-antenna the 300 W were ju= st good for only 100 meters.

Of course one limiting factor stil= l is the influence of trees and buildings.

But what is the infl= uence of the different frequencies used? I did my tests around 8.9 kHz. No= w I reproduced them with 1 kHz but the audibility did not improve. I teste= t the other frequencies in 1kHz steps up to 8.9 kHz with the same results.= So I am sure that I hear more ore less linear in that frequency range. So= the different frequencies can not be the reason for my lower "ODX".
=
In the next step I tried to hear not a single frequency but a 1 kHz= stepped sweep signal between 2 and 8.9 kHz and later a DFCW signal 2.5 an= d 3 kHz. The sweep signal was clearly audible at more than double the rang= e. My "ODX" increased to nearly 300 Meters just by ear.

The eff= ect seems to be more psychological. I heard the stepped sweep signal much= better than its single frequencies.

Could it improve the audib= ility to go from A1 to A2 by just modulating the carrier with an other? I= assume an oscillator like XR2206 is not stable enough but possibly worth= a try.

Possibly anybody knows a software that achieves creatin= g a testfile.

But this is not of priority.

Tomorrow= I'll do another near field test with an eField antenna at my roof top.
One can discuss sense or nonsense of this walk around tests. To= me it's fun.

Of course other more DX related (OK, I hope so.)= tests will follow within the next weeks. Yesterday I conducted most of my= material for the earth base test coming soon. The most important: about= 800m crude wire are now on a reel. I don't know how often I crossed the= soccer field in my neighbourhood . . .

vy73 Horst DO1KHS/DI2AN=
  

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