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=0.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_HOTMAIL_RCVD,HTML_40_50,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 t9ELxilZ010252 for ; Wed, 14 Oct 2015 23:59:45 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZmU27-0007oX-0G for rs_out_1@blacksheep.org; Wed, 14 Oct 2015 22:56:27 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZmU26-0007oO-Kv for rsgb_lf_group@blacksheep.org; Wed, 14 Oct 2015 22:56:26 +0100 Received: from blu004-omc1s20.hotmail.com ([65.55.116.31]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-SHA384:256) (Exim 4.86) (envelope-from ) id 1ZmU12-0000au-Lb for rsgb_lf_group@blacksheep.org; Wed, 14 Oct 2015 22:56:25 +0100 Received: from BLU185-W92 ([65.55.116.9]) by BLU004-OMC1S20.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.23008); Wed, 14 Oct 2015 14:55:03 -0700 X-TMN: [HDMIPlcJYKZ0ecfDWix0A7uMmvTaL06y] X-Originating-Email: [hellozerohellozero@hotmail.com] Message-ID: From: Laurence KL7 L To: "rsgb_lf_group@blacksheep.org" Date: Wed, 14 Oct 2015 13:55:02 -0800 Importance: Normal In-Reply-To: References: <1821006912.20151014193718@chriswilson.tv>,,, MIME-Version: 1.0 X-OriginalArrivalTime: 14 Oct 2015 21:55:03.0242 (UTC) FILETIME=[FADD42A0:01D106CA] X-Scan-Signature: 913d7a7c91a460d176c89ad756da16f9 Content-Type: multipart/alternative; boundary="_c587d9e1-b790-4d8a-a243-26a4dd498708_" 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: 4387 --_c587d9e1-b790-4d8a-a243-26a4dd498708_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Yep Mike=2C Andy et al - its a good point - I have a small pad on output of= the power injector but haven't managed to blow up "a" front end yet and ap= parently Ive tried many times...didn't someone mod a PA0RDT into a small tr= ansmitter using the 5109 as the output ? My SDR follows suit by flashing "= SOS" in morse code... =20 =20 Laurence KL7 L enroute to G land =20 Date: Wed=2C 14 Oct 2015 21:36:20 +0100 From: andy.g4jnt@gmail.com To: rsgb_lf_group@blacksheep.org Subject: Re: LF: PA0RDT antenna near a TX? Front end OK? My Procomm AAC-1 =2C when sitting under the 137kHz antenna with 700 Watts = feeding it (ie. about 7metres away at the shortest distance) =2C delivers a= clipped waveform of 6V pk=3Dpk into a 50 ohm load. About +20dBm. =20 The SDR I/Q objects and complains forcibly by flashing its red overload led= =2C but it can survive that sort of level. Any receiver that can't survive= 100mW on its input is best put out of its misery=2C anyway. 'jnt On 14 October 2015 at 21:24=2C Michael Sapp wrote: =0A= =0A= =0A= =0A= =0A= =0A= =0A= Laurence=2C Chris & All: I did a test with =0A= my eprobe which is about 30 feet away from my HF elevated ground plane that= has =0A= 65 ft radials a few years back. With 100W output on 40 meters. I was gettin= g 1mw =0A= of RF power from the eprobe into a Boonton RF voltmeter. I was using a 1 in= ch =0A= wide by 12 inch long brass strip as the eprobe antenna at the time. I =0A= would assume the eprobe may be able to generate more power than that at hig= her =0A= nearby transmitter power levels. Suitable overload protection for a =0A= receiver front end would appear to be prudent.....=0A= =0A= 73=2C Mike wa3tts=0A= =0A= =0A= =0A= ----- Original Message ----- =0A= From: =0A= Laurence KL7 L =0A= To: rsgb_lf_group@blacksheep.org =0A= =0A= Sent: Wednesday=2C October 14=2C 2015 2:56 =0A= PM=0A= Subject: RE: LF: PA0RDT antenna near a =0A= TX? Front end OK?=0A= =20 =0A= Chris =20 I run up to 1Kw on 136kHz and up to 400W =0A= on 475kHz and "alive" Eprobes (L400 and PA0RDT variants) about =0A= 100-150ft away up at 30ft plus and not blown them up. They don't like it = =0A= much of course and produce unwanted products during Tx but that not =0A= surprising. =20 Only FET failure to date has been down in Oklahoma =0A= from a nearby lightning strike. =20 =20 Laurence KL7L et =0A= al =20 =0A= > >=20 > If I mount my PA0RDT clone on my mast stub=2C about =0A= 50 feet from my LF > TX'ing aerial=2C is it likely to be damaged if =0A= powered on when TX'ing? >=20 > Thanks. > Best =0A= regards=2C > Chris mailto:chris@chriswilson.tv >=20 > =0A= =20 =0A= = --_c587d9e1-b790-4d8a-a243-26a4dd498708_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Yep Mike=2C Andy et al - its a g= ood point - I have a small pad on =3Boutput of the power injector = =3Bbut haven't managed to blow up "a" front end yet and apparently Ive trie= d many times...didn't someone mod a PA0RDT into a small transmitter =3B= using the 5109 as the output ? =3B My SDR follows suit by flashing "SOS= " in morse code...
 =3B
 =3B
Laurence KL7 L =3B enrout= e to G land
 =3B
Date: Wed=2C 14 Oct= 2015 21:36:20 +0100
From: andy.g4jnt@gmail.com
To: rsgb_lf_group@bla= cksheep.org
Subject: Re: LF: PA0RDT antenna near a TX? Front end OK?
=
My Procomm AAC-1 =2C when sitting under the 137kHz &nb= sp=3Bantenna with 700 Watts feeding it (ie. about 7metres away at the short= est distance) =2C delivers a clipped waveform of 6V pk=3Dpk into a 50 ohm l= oad.  =3B About +20dBm.  =3B =3B

The SDR I/Q= objects and complains forcibly by flashing its red overload led=2C but it = can survive that sort of level. =3B Any receiver that can't survive &nb= sp=3B100mW on its input is best put out of its misery=2C anyway.
=
'jnt


On 14 October 2015 at 21:24=2C Michael S= app <=3Bwa3tts@verizon.net>=3B wrote:
<= u>=0A= =0A= =0A= =0A= =0A= =0A=
=0A=
Laurence=2C Chris &=3B All: =3B= I did a test with =0A= my eprobe which is about 30 feet away from my HF elevated ground plane that= has =0A= 65 ft radials a few years back. With 100W output on 40 meters. I was gettin= g 1mw =0A= of RF power from the eprobe into a Boonton RF voltmeter. I was using a 1 in= ch =0A= wide =3Bby 12 inch long brass strip as the eprobe antenna at the time.&= nbsp=3B I =0A= would assume the eprobe may be able to generate more power than that at hig= her =0A= nearby transmitter power levels. =3BSuitable overload protection for a = =0A= receiver front end would appear to be prudent.....
=0A=
 =3B
=0A=
73=2C Mike wa3tts
=0A=
 =3B
=0A=
 =3B
=0A=
=0A=
----- Original Message -----
=0A=
From: =0A= Laurence KL7 L
=0A= =0A=
Sent: Wednesday=2C October 14=2C 2015 2:56 =0A= PM
=0A=
Subject: RE: LF: PA0RDT antenna near a =0A= TX? Front end OK?
=0A=

=0A=
Chris
 =3B
I run =3Bup to 1Kw on 136kHz an= d up to 400W =0A= on 475kHz =3Band "alive" =3BEprobes (L400 and PA0RDT variants) ab= out =0A= 100-150ft away up at 30ft plus =3Band not blown them up. They don't l= ike it =0A= much of course and produce unwanted products during Tx but that not =0A= surprising.
 =3B
Only FET failure to date has been down in Okla= homa =0A= from a nearby lightning strike.
 =3B
 =3B
Laurence
KL= 7L et =0A= al
 =3B
=0A=
>=3B
>=3B
>=3B If I mount my PA0RDT clone on my mast st= ub=2C about =0A= 50 feet from my LF
>=3B TX'ing aerial=2C is it likely to be damaged = if =0A= powered on when TX'ing?
>=3B
>=3B Thanks.

>=3B Best = =0A= regards=2C
>=3B Chris mailto:chris@chriswilson.tv
>=3B
>=3B =0A=
=0A=

= --_c587d9e1-b790-4d8a-a243-26a4dd498708_--