Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.6 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_HOTMAIL_RCVD,HTML_40_50,HTML_MESSAGE,MIME_BASE64_NO_NAME 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 t9F5ZBQC011346 for ; Thu, 15 Oct 2015 07:35:11 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Zmb56-0008Q2-5f for rs_out_1@blacksheep.org; Thu, 15 Oct 2015 06:28:00 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Zmb55-0008Pt-Qa for rsgb_lf_group@blacksheep.org; Thu, 15 Oct 2015 06:27:59 +0100 Received: from blu004-omc1s8.hotmail.com ([65.55.116.19]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-SHA384:256) (Exim 4.86) (envelope-from ) id 1Zmb41-0001DT-OX for rsgb_lf_group@blacksheep.org; Thu, 15 Oct 2015 06:27:58 +0100 Received: from BLU403-EAS424 ([65.55.116.7]) by BLU004-OMC1S8.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.23008); Wed, 14 Oct 2015 22:26:36 -0700 X-TMN: [Nb24OP/aIXa7pxf/XvsJ1ylzoP3cFN5tMk+mSpmOwRw=] X-Originating-Email: [hellozerohellozero@hotmail.com] Message-ID: From: Laurence KL7 L MIME-Version: 1.0 (1.0) Date: Wed, 14 Oct 2015 21:26:33 -0800 References: <1821006912.20151014193718@chriswilson.tv> To: "rsgb_lf_group@blacksheep.org" In-Reply-To: X-OriginalArrivalTime: 15 Oct 2015 05:26:36.0110 (UTC) FILETIME=[0F78D6E0:01D1070A] X-Scan-Signature: f7f918e40888a44a70dddae14bd6a529 Content-Type: multipart/alternative; boundary="Apple-Mail-7BF3DB5C-FBF7-47A4-9F31-F782B27D4A61" Content-Transfer-Encoding: 7bit Subject: Re: LF: PA0RDT antenna near a TX? Front end OK? 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: 4389 --Apple-Mail-7BF3DB5C-FBF7-47A4-9F31-F782B27D4A61 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Chris Mike JNT et al - So this piqued my measurement interest=20 This evening running circa 2W ERP at 137kHz 1Kw from Decca 5501, I measured t= he following:- Ve7sl clone 10ft diameter screened mag loop burhans amp at 50ft from 500ft c= ircumference tx loop gave plus 13.2dBm into terminated 75ohms W and G SPM30= (oerrr!) - this is normally connected via a 6dB pad to an Icom R75 without i= ssue to date. Amp appears to have a lot of "head room" And -8.4dBm from an LF engineering L400b probe at 150ft or so Interesting Laurence KL7L WE2XPQ Wspr 2 136kHz till dawn > On Oct 14, 2015, at 12:27, Michael Sapp wrote: >=20 > Laurence, Chris & All: I did a test with my eprobe which is about 30 feet= away from my HF elevated ground plane that has 65 ft radials a few years ba= ck. With 100W output on 40 meters. I was getting 1mw of RF power from the ep= robe into a Boonton RF voltmeter. I was using a 1 inch wide by 12 inch long b= rass strip as the eprobe antenna at the time. I would assume the eprobe may= be able to generate more power than that at higher nearby transmitter power= levels. Suitable overload protection for a receiver front end would appear t= o be prudent..... > =20 > 73, Mike wa3tts > =20 > =20 > ----- Original Message ----- > From: Laurence KL7 L > To: rsgb_lf_group@blacksheep.org > Sent: Wednesday, October 14, 2015 2:56 PM > Subject: RE: LF: PA0RDT antenna near a TX? Front end OK? >=20 > Chris > =20 > I run up to 1Kw on 136kHz and up to 400W on 475kHz and "alive" Eprobes (L4= 00 and PA0RDT variants) about 100-150ft away up at 30ft plus and not blown t= hem up. They don't like it much of course and produce unwanted products duri= ng Tx but that not surprising. > =20 > Only FET failure to date has been down in Oklahoma from a nearby lightning= strike. > =20 > =20 > Laurence > KL7L et al > =20 > > > >=20 > > If I mount my PA0RDT clone on my mast stub, about 50 feet from my LF > > TX'ing aerial, is it likely to be damaged if powered on when TX'ing? > >=20 > > Thanks. >=20 > > Best regards, > > Chris mailto:chris@chriswilson.tv > >=20 > >=20 --Apple-Mail-7BF3DB5C-FBF7-47A4-9F31-F782B27D4A61 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: base64 PGh0bWw+PGhlYWQ+PG1ldGEgaHR0cC1lcXVpdj0iY29udGVudC10eXBlIiBjb250ZW50PSJ0ZXh0 L2h0bWw7IGNoYXJzZXQ9dXRmLTgiPjwvaGVhZD48Ym9keSBkaXI9ImF1dG8iPjxkaXY+Q2hyaXMg TWlrZSBKTlQgZXQgYWwgLSBTbyB0aGlzIHBpcXVlZCBteSBtZWFzdXJlbWVudCBpbnRlcmVzdCZu YnNwOzwvZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+VGhpcyBldmVuaW5nIHJ1bm5pbmcgY2lyY2Eg MlcgRVJQIGF0IDEzN2tIeiAxS3cgZnJvbSBEZWNjYSA1NTAxLCBJIG1lYXN1cmVkIHRoZSBmb2xs 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