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=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,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 t9EKSoQx009966 for ; Wed, 14 Oct 2015 22:28:50 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZmScr-0007A7-HN for rs_out_1@blacksheep.org; Wed, 14 Oct 2015 21:26:17 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZmScr-00079w-6t for rsgb_lf_group@blacksheep.org; Wed, 14 Oct 2015 21:26:17 +0100 Received: from vms173023pub.verizon.net ([206.46.173.23]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1ZmSbq-0000I4-T6 for rsgb_lf_group@blacksheep.org; Wed, 14 Oct 2015 21:26:15 +0100 Received: from MichaelSappPC ([108.32.76.42]) by vms173023.mailsrvcs.net (Oracle Communications Messaging Server 7.0.5.32.0 64bit (built Jul 16 2014)) with ESMTPA id <0NW800B4L8P828O0@vms173023.mailsrvcs.net> for rsgb_lf_group@blacksheep.org; Wed, 14 Oct 2015 15:24:44 -0500 (CDT) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.1 cv=MtGvkDue c=1 sm=1 tr=0 a=NqZc8iEf3tDsxMUtaiSuhg==:117 a=o1OHuDzbAAAA:8 a=oR5dmqMzAAAA:8 a=5lJygRwiOn0A:10 a=r77TgQKjGQsHNAKrUKIA:9 a=F3M5lZpKAAAA:8 a=I78yW7XCFXC3_TT9jwQA:9 a=ZBrQ7B2h7Kp4pgvF:21 a=QLr5Z93nD260IHt9:21 a=wPNLvfGTeEIA:10 a=69EAbJreAAAA:8 a=6aZHFv9q3oHL-kxP8xoA:9 a=0kR2djqRPEfQTcB3:21 a=KGUQ4ktNN0rCGSiV:21 a=I-siGf2IR_FrYaDN:21 a=_W_S_7VecoQA:10 Message-id: From: "Michael Sapp" To: References: <1821006912.20151014193718@chriswilson.tv> In-reply-to: Date: Wed, 14 Oct 2015 16:24:37 -0400 MIME-version: 1.0 X-Priority: 3 X-MSMail-priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MIMEOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 X-Scan-Signature: 9be3f060697a097db7a337109fbeece1 Subject: Re: LF: PA0RDT antenna near a TX? Front end OK? Content-type: multipart/alternative; boundary="----=_NextPart_000_0014_01D1069C.D1FA6D50" 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: 4383 This is a multi-part message in MIME format. ------=_NextPart_000_0014_01D1069C.D1FA6D50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 back. With 100W output on 40 meters. I was getting 1mw of RF power = from the eprobe into a Boonton RF voltmeter. I was using a 1 inch wide = by 12 inch long brass 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 to be prudent..... 73, Mike wa3tts ----- Original Message -----=20 From: Laurence KL7 L=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, October 14, 2015 2:56 PM Subject: RE: LF: PA0RDT antenna near a TX? Front end OK? Chris =20 I run up to 1Kw on 136kHz and up to 400W on 475kHz and "alive" Eprobes = (L400 and PA0RDT variants) about 100-150ft away up at 30ft plus and not = blown them up. They don't like it much of course and produce unwanted = products during 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. > Best regards, > Chris mailto:chris@chriswilson.tv >=20 >=20 ------=_NextPart_000_0014_01D1069C.D1FA6D50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Laurence, Chris & All:  I did = a test with=20 my eprobe which is about 30 feet away from my HF elevated ground plane = that has=20 65 ft radials a few years back. With 100W output on 40 meters. I was = getting 1mw=20 of RF power from the eprobe into a Boonton RF voltmeter. I was using a 1 = inch=20 wide by 12 inch long brass strip as the eprobe antenna at the = time.  I=20 would assume the eprobe may be able to generate more power than that at = higher=20 nearby transmitter power levels. Suitable overload protection for a = receiver front end would appear to be prudent.....
 
73, Mike wa3tts
 
 
----- Original Message -----
From:=20 Laurence KL7 L =
Sent: Wednesday, October 14, = 2015 2:56=20 PM
Subject: RE: LF: PA0RDT antenna = near a=20 TX? Front end OK?

Chris
 
I run up to 1Kw on 136kHz and = up to 400W=20 on 475kHz and "alive" Eprobes (L400 and PA0RDT variants) = about=20 100-150ft away up at 30ft plus and not blown them up. They don't = like it=20 much of course and produce unwanted products during Tx but that not=20 surprising.
 
Only FET failure to date has been down in = Oklahoma=20 from a nearby lightning = strike.
 
 
Laurence
KL7L et=20 al
 
>
>
> If I mount my PA0RDT clone on my mast stub, = about=20 50 feet from my LF
> TX'ing aerial, is it likely to be damaged = if=20 powered on when TX'ing?
>
> Thanks.

> Best=20 regards,
> Chris mailto:chris@chriswilson.tv
>
>=20
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