Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1E297380000EB; Thu, 23 Feb 2012 10:31:13 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1S0aGG-0002cY-6d for rs_out_1@blacksheep.org; Thu, 23 Feb 2012 15:07:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1S0aGF-0002cP-O1 for rsgb_lf_group@blacksheep.org; Thu, 23 Feb 2012 15:07:11 +0000 Received: from smtpout3.wanadoo.co.uk ([80.12.242.59] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1S0aGD-0000Vb-6m for rsgb_lf_group@blacksheep.org; Thu, 23 Feb 2012 15:07:11 +0000 Received: from AGB ([2.26.28.237]) by mwinf5d38 with ME id dT721i00F56wrde03T73CB; Thu, 23 Feb 2012 16:07:03 +0100 Message-ID: <5D419166A1424E34AC9BE76ED0F35351@AGB> From: "Graham" To: References: <000501ccf191$e3929c50$0401a8c0@xphd97xgq27nyf> <4F455C82.9040303@usa.net> <4F463F6E.4060008@iup.uni-heidelberg.de> <4F4648E6.2010202@usa.net> <4F464FE3.5060102@iup.uni-heidelberg.de> In-Reply-To: <4F464FE3.5060102@iup.uni-heidelberg.de> Date: Thu, 23 Feb 2012 15:07:02 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 120223-0, 23/02/2012), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: DK7FC in North Italy Content-Type: multipart/alternative; boundary="----=_NextPart_000_0032_01CCF23C.CC44C400" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_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-SCOLL-SCORE: 0:2:484480096:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d4ad14f465bc15f37 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0032_01CCF23C.CC44C400 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable two beer cans spaced abt 1.5m ..... more intermodulation=20 Q was that prediction made when the cans where full ..or slightly = afterwards ? G.. From: Stefan Sch=E4fer=20 Sent: Thursday, February 23, 2012 2:40 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: DK7FC in North Italy Hi Alberto, Interesting. Keep us informed about your results with the short active = dipole. I've never tried such an antenna so far. But maybe it could be = an idea, if the ground is QRM-contaminated... 73, Stefan/DK7FC Am 23.02.2012 15:10, schrieb Alberto di Bene:=20 On 2/23/2012 2:30 PM, Stefan Sch=E4fer wrote:=20 Hi Alberto, That looks fine. I'm glad to get a report from you, thank you. How long was that wire and was it in the house or outside? :-)Hi Stefan, oh, that wire was just a dipole for the 40m band, directly = connected to the receiver, without any form of tuning for the 137kHz = band. Signals are low, but so also is the noise... :-) =20 Often is advantageous to have a not so high gain antenna... the S/N = ratio can improve... not always, but sometimes yes. That dipole is low in height. Actually it is an inverted V, with the = apex at 10m from the ground. For the LF band I have also a mini whip, temporarily out of service, = as I used the coax feeding it for some tests of a differential active = antenna, with two beer cans spaced abt 1.5m connected to the differential = inputs of a high impedance amplifier. It works quite well, as it does not need to be referred to a ground potential, but maybe I have to = change the schematic of that transimpedance amplifier, as it exhibits more intermodulation that I thought it should have.... 73 Alberto I2PHD ------=_NextPart_000_0032_01CCF23C.CC44C400 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
two beer cans spaced abt 1.5m  ..... more=20 intermodulation
 
Q was that  prediction  = made when=20 the  cans  where full  ..or  slightly  = afterwards =20 ?
 
G..

From: Stefan = Sch=E4fer
Sent: Thursday, February 23, 2012 2:40 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: DK7FC in North Italy

Hi Alberto,

Interesting. Keep us informed about = your=20 results with the short active dipole. I've never tried such an antenna = so far.=20 But maybe it could be an idea, if the ground is = QRM-contaminated...

73,=20 Stefan/DK7FC

Am 23.02.2012 15:10, schrieb Alberto di Bene:=20
On = 2/23/2012 2:30=20 PM, Stefan Sch=E4fer wrote:=20 
Hi Alberto,

That looks fine. I'm glad to get a report from you, thank you.
How long was that wire and was it in the house or outside? :-)
Hi Stefan,

   oh, that wire was just a = dipole for=20 the 40m band, directly connected to the receiver, without any form of = tuning=20 for the 137kHz band.
Signals are low, but so also is the = noise... =20 :-)    =20
Often is advantageous to have a not so high gain = antenna...=20 the S/N ratio can improve... not always, but sometimes = yes.

That dipole=20 is low in height. Actually it is an inverted V, with the apex at 10m = from the=20 ground.
For the LF band I have also a mini whip, temporarily out of = service, as I used the coax feeding it for some tests of a = differential active=20 antenna,
with two beer cans spaced abt 1.5m connected to the = differential=20 inputs of a high impedance amplifier.  It works quite well, as = it =20 does
not need to be referred to a ground potential, but maybe I = have to=20 change the schematic of that transimpedance amplifier, as = it
exhibits more=20 intermodulation that I thought it should have....

73 =20 Alberto  I2PHD

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