Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me01.r1000.mx.aol.com (Internet Inbound) with ESMTP id EFD39380000B2; Mon, 28 May 2012 11:58:59 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SZ2KP-0006Vj-JO for rs_out_1@blacksheep.org; Mon, 28 May 2012 16:57:53 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SZ2KP-0006Va-4C for rsgb_lf_group@blacksheep.org; Mon, 28 May 2012 16:57:53 +0100 Received: from smtplq-out14.aruba.it ([62.149.158.34] helo=smtplq03.aruba.it) by relay1.thorcom.net with smtp (Exim 4.77) (envelope-from ) id 1SZ2KM-0005M8-K0 for rsgb_lf_group@blacksheep.org; Mon, 28 May 2012 16:57:51 +0100 Received: (qmail 32099 invoked by uid 89); 28 May 2012 15:57:46 -0000 Received: from unknown (HELO smtp1.aruba.it) (62.149.158.221) by smtplq03.aruba.it with SMTP; 28 May 2012 15:57:46 -0000 Received: (qmail 15716 invoked by uid 89); 28 May 2012 15:57:46 -0000 Received: from unknown (HELO mauro.stmb.it) (ik1wvq@stmb.it@79.0.194.171) by smtp1.ad.aruba.it with SMTP; 28 May 2012 15:57:46 -0000 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Mon, 28 May 2012 17:57:33 +0200 To: rsgb_lf_group@blacksheep.org From: IK1WVQ Mauro In-Reply-To: <4FC39CF3.7020701@legal-medicine.de> References: <4FC39CF3.7020701@legal-medicine.de> Mime-Version: 1.0 X-Spam-Rating: smtp1.ad.aruba.it 1.6.2 0/1000/N X-Spam-Rating: smtplq03.aruba.it 1.6.2 0/1000/N X-HELO-Warning: Remote host 62.149.158.34 (smtplq-out14.aruba.it) used invalid HELO/EHLO smtplq03.aruba.it - verification failed X-Spam-Score: 0.1 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: unfortunately I do not know the ansver to your question, but I am VERY interested on this kind of antennas for my 137 and 500KHz rx .. please, how big are the "probes" ??? Is this antenna also usable for 8KHZ dream bands, or for SAQ Grimeton reception ?? [...] Content analysis details: (0.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [62.149.158.34 listed in list.dnswl.org] 0.1 MISSING_MID Missing Message-Id: header X-Scan-Signature: ac0f6ff1af52b6036ac1f4fe0c2bd52c Message-Id: Subject: Re: LF: VLF/LF-Preamp Content-Type: text/plain; charset="us-ascii"; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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: 0:2:415268160:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60894fc3a0c343c9 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none unfortunately I do not know the ansver to your question, but I am VERY interested on this kind of antennas for my 137 and 500KHz rx .. please, how big are the "probes" ??? Is this antenna also usable for 8KHZ dream bands, or for SAQ Grimeton reception ?? I tried the PA0RDT mini whip, but I am not satisfied .. noise, noise, noise and (I think) intermodulation .... Many thanks in advance.. 73 de Mauro IK1WVQ At 17.42 28/05/12, you wrote: >Hi, > >After all those meta-discussions here's a more serious problem: > >I'm playing around with a new e-field probe based on the INA111. >http://www.ti.com/product/ina111 > >Schematic: http://www.df3lp.de/misc/rx/INA111_preamp.png > >It's working fine and the local interferences are lower compared to >my old non-balanced design running here on balcony. That was the goal. > >Amplification is quite enough to drive a M-Audio audiophile 192 soundcard. >There's a second transformer (1:4) at the af-inputs. The coupling >capacitance of those transformers are below 10pF each. > >I'm using the shields of a thin double coaxial line for bringing up >the supply voltage. The voltage splitter is located at the far end >inside the small amplifier box. > >The problem is that I'm observing to a lot of interferences/microphonics >"from behind" when touching the battery located inside the house. > >??? > >Peter, df3lp > > > >Nessun virus nel messaggio in arrivo. >Controllato da AVG - www.avg.com >Versione: 9.0.930 / Database dei virus: 2410.1.1/5028 - Data di >rilascio: 05/28/12 12:35:00