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[86.30.112.201]) by mx.google.com with ESMTPSA id p1sm42516654wix.9.2013.07.05.12.17.49 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 05 Jul 2013 12:17:50 -0700 (PDT) References: <977A4C4B-4EE3-4BBD-9B0E-15DC077C197C@gmail.com> <1373041563.73092.YahooMailNeo@web87803.mail.ir2.yahoo.com> From: Roger Lapthorn X-Mailer: iPod Mail (10A523) In-Reply-To: <1373041563.73092.YahooMailNeo@web87803.mail.ir2.yahoo.com> Message-Id: <893BBFDB-5B79-4B03-A042-005C0439D0E7@gmail.com> Date: Fri, 5 Jul 2013 20:17:50 +0100 To: "rsgb_lf_group@blacksheep.org" Mime-Version: 1.0 (1.0) X-Spam-Score: -0.7 (/) 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: Many thanks Dennis. 73s Roger On 5 Jul 2013, at 17:26, DENNIS EASTERLING wrote: [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.212.176 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rogerlapthorn[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 9d01e9df836df8dd3868645661e1c1f7 Subject: Re: LF: Wellbrook RX loops Content-Type: multipart/alternative; boundary=Apple-Mail-992C1A97-84CF-4FAC-9C6C-9D1FA6F11F94 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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 Status: O X-Status: X-Keywords: X-UID: 3345 --Apple-Mail-992C1A97-84CF-4FAC-9C6C-9D1FA6F11F94 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Many thanks Dennis.=20 73s Roger On 5 Jul 2013, at 17:26, DENNIS EASTERLING wrote: > Hi Roger > =20 > I use a Wellbrook Loop type ALA1530 (MW/HF) mounted 1m off the ground and= a PA0RDT mini-whip mounted about 7m above ground. Sometimes the loop wins= other times the miniwhip. The miniwhip is omnidirectional and uses the e f= ield, whereas the loop is directional and uses the magnetic field. The min= iwhip is more open to BC breakthough than the loop but more sensitive. I t= end to monitor with the miniwhip, and switch to the loop after homing in on t= he signal if this helps. BC breakthough is overcome using a simple series L= C circuit tuned to the required band at the RX end of the coax. The QRM at= my QRT can be horrendous, as I am only 100 yards from the OH lines on the E= ast Coast main railway line, surrounded by houses and a block of flats with a= ssociated busy roads. My 'T' transmitting aerial 8m high is useless for RX= . I can fully recommend both miniwhip and Wellbrook Loop, both of which co= ver from LF to 10m. For best results, I suppose a tuned loop about 1m squa= re has the edge, but not as convenient.=20 > =20 > 73 Dennis M0JXM >=20 > From: Roger Lapthorn > To: "rsgb_lf_group@blacksheep.org" ; rsgb_lf= _group@yahoogroups.co.uk=20 > Sent: Friday, 5 July 2013, 7:00 > Subject: LF: Wellbrook RX loops >=20 > Can anyone advise, from actual use, how well a Wellbrook loop works on 13= 6 and 472kHz RX ? The excellent OIP2 and OIP3 figures and directivity sugges= t one could be very useful.=20 >=20 > 73s > Roger G3XBM >=20 >=20 --Apple-Mail-992C1A97-84CF-4FAC-9C6C-9D1FA6F11F94 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit
Many thanks Dennis. 

73s Roger

On 5 Jul 2013, at 17:26, DENNIS EASTERLING <dennis.easterling@btinternet.com> wrote:

Hi Roger
 
I use a Wellbrook Loop type ALA1530 (MW/HF)  mounted 1m off the ground and a PA0RDT mini-whip mounted about 7m above ground.   Sometimes the loop wins other times the miniwhip.   The miniwhip is omnidirectional and uses the e field, whereas the loop is directional and uses the magnetic field.   The miniwhip is more open to BC breakthough than the loop but more sensitive.   I tend to monitor with the miniwhip, and switch to the loop after homing in on the signal if this helps.   BC breakthough is overcome using a simple series LC circuit tuned to the required band at the RX end of the coax.   The QRM at my QRT can be horrendous, as I am only 100 yards from the OH lines on the East Coast main railway line, surrounded by houses and a block of flats with associated busy roads.   My 'T' transmitting aerial 8m high is useless for RX.   I can fully recommend both miniwhip and Wellbrook Loop, both of which cover from LF to 10m.   For best results, I suppose a tuned loop about 1m square has the edge, but not as convenient. 
 
73 Dennis M0JXM

From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>; rsgb_lf_group@yahoogroups.co.uk
Sent: Friday, 5 July 2013, 7:00
Subject: LF: Wellbrook RX loops

Can anyone advise, from actual use,  how well a Wellbrook loop works on 136 and 472kHz RX ? The excellent OIP2 and OIP3 figures and directivity suggest one could be very useful.

73s
Roger G3XBM


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