Return-Path: X-Spam-DCC: paranoid 1290; Body=3 Fuz1=2 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t19K3JPM000351 for ; Mon, 9 Feb 2015 21:03:20 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YKuTh-0008OR-LI for rs_out_1@blacksheep.org; Mon, 09 Feb 2015 19:58:41 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YKuTh-0008OI-9E for rsgb_lf_group@blacksheep.org; Mon, 09 Feb 2015 19:58:41 +0000 Received: from emout04.email.it ([212.97.34.71]) by relay1.thorcom.net with esmtp (Exim 4.85) (envelope-from ) id 1YKuTf-00014x-7F for rsgb_lf_group@blacksheep.org; Mon, 09 Feb 2015 19:58:40 +0000 Received: from emout04.email.it (localhost [127.0.0.1]) by emout04.email.it (Postfix) with ESMTP id 7C6D9961F3 for ; Mon, 9 Feb 2015 20:58:35 +0100 (CET) Received: from d620.localnet (unknown [176.200.104.167]) by emout04.email.it (Postfix) with ESMTPA id 42CA8961F2 for ; Mon, 9 Feb 2015 20:58:34 +0100 (CET) From: Claudio Pozzi To: rsgb_lf_group@blacksheep.org Date: Mon, 9 Feb 2015 20:58:34 +0100 User-Agent: KMail/1.13.7 (Linux/3.2.0-4-686-pae; KDE/4.8.4; i686; ; ) References: <54D7E5BB.4000407@virginbroadband.com.au> <54D7ED93.3040904@gmail.com> In-Reply-To: <54D7ED93.3040904@gmail.com> X-KMail-Markup: true MIME-Version: 1.0 Message-Id: <201502092058.34583.smtp01@email.it> X-Scan-Signature: b8b011f938af8abc4b241335cabd0691 Subject: Re: LF: WSPR MF please Content-Type: multipart/alternative; boundary="Boundary-01=_qFR2U+wC2MmW/aL" Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 2295 --Boundary-01=_qFR2U+wC2MmW/aL Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit On Monday, February 09, 2015 00:13:23 you wrote: HI Stefan! > There's just one thing: The T antenna in the garden is resonated and > matched to 50 Ohm. However i forgot to connect a 50 Ohm terminating > resistor to the RX input. Probably the matched antenna does not act as a > perfect bandpass for all frequecies and maybe there's a standing wave on > the 20m long coax cable, resulting in a high input voltage in the HF or > lower VHF range? You should say "20m short coax cable" ;-) = 0.032 wavelength! In my opinion if the cable is shorter than 0.1 wavelength and low loss VSWR doesn't matter. 73 de Claudio IK2PII -- Claudio Pozzi - rispondere a cla.po@tiscali.it -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it/?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Registra i domini che desideri ed inizia a creare il tuo sito web Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13323&d=9-2 --Boundary-01=_qFR2U+wC2MmW/aL Content-Type: text/html; charset="iso-8859-15" Content-Transfer-Encoding: 7bit

On Monday, February 09, 2015 00:13:23 you wrote:

HI Stefan!

> There's just one thing: The T antenna in the garden is resonated and

> matched to 50 Ohm. However i forgot to connect a 50 Ohm terminating

> resistor to the RX input. Probably the matched antenna does not act as a

> perfect bandpass for all frequecies and maybe there's a standing wave on

> the 20m long coax cable, resulting in a high input voltage in the HF or

> lower VHF range?

You should say "20m short coax cable" ;-) = 0.032 wavelength!

In my opinion if the cable is shorter than 0.1 wavelength and low loss

VSWR doesn't matter.

73 de Claudio IK2PII

Claudio Pozzi - rispondere a cla.po@tiscali.it

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