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[195.171.43.25]) by mx.google.com with ESMTP id i44si7495660eew.307.2013.07.05.12.40.10 for ; Fri, 05 Jul 2013 12:40:12 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UvApS-0001Iy-A7 for rs_out_1@blacksheep.org; Fri, 05 Jul 2013 19:33:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UvApR-0001Ip-Q3 for rsgb_lf_group@blacksheep.org; Fri, 05 Jul 2013 19:33:57 +0100 Received: from smtpout3.wanadoo.co.uk ([80.12.242.59] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1UvApP-000439-NE for rsgb_lf_group@blacksheep.org; Fri, 05 Jul 2013 19:33:56 +0100 Received: from AGB ([95.145.211.218]) by mwinf5d42 with ME id wiZu1l00X4jGl6f03iZuda; Fri, 05 Jul 2013 20:33:55 +0200 Message-ID: From: "Graham" To: Date: Fri, 5 Jul 2013 19:33:54 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. 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Content preview: There is a good example of Mini-whip V 40 ft end fed vertical , db levels are the average over 32 mins , so that would tend to give a realistic evaluation , as opposed to peak , which would reflect one major incident during the time lime [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.59 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: b0c81be0f3328ec24fe2fd5b2fd44f86 Subject: Fw: LF: Wellbrook RX loops Content-Type: multipart/alternative; boundary="----=_NextPart_000_0051_01CE79B6.95E848C0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.7 required=5.0 tests=HTML_40_50,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,MISSING_OUTLOOK_NAME 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: 45 This is a multi-part message in MIME format. ------=_NextPart_000_0051_01CE79B6.95E848C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable There is a good example of Mini-whip V 40 ft end fed vertical = , db levels are the average over 32 mins , so that would tend = to give a realistic evaluation , as opposed to peak , which = would reflect one major incident during the time lime=20 Stations about 25 miles apart west<>east=20 G.. 23:02 136 G3XDV de G4WGT Op32 160 mi -12 dB in Chorley, IO83qo with 0.3w = + Inv-L 23:02 136 G3XDV de G0NBD Op32 163 mi -23 dB in Nr Liverpool with 0.3w + = Inv-L From: DENNIS EASTERLING=20 Sent: Friday, July 05, 2013 5:26 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Re: LF: Wellbrook RX loops 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.=20 73 Dennis M0JXM 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 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.=20 73s Roger G3XBM ------=_NextPart_000_0051_01CE79B6.95E848C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
There  is a  good   example  of =20 Mini-whip   V  40 ft  end fed  vertical  , = db=20 levels  are  the  average over  32 mins  , = so =20 that  would  tend  to  give  a =20 realistic   evaluation  , as opposed = to  peak  ,=20 which  would  reflect one  major  incident=20  during  the  time lime
 
Stations  about  25  miles  apart =20 west<>east
 
G..
 

23:02 136 G3XDV de G4WGT Op32 160 mi -12 dB in Chorley, = IO83qo with=20 0.3w + Inv-L

23:02 136 G3XDV de G0NBD Op32 163 mi -23 dB in Nr Liverpool = with 0.3w=20 + Inv-L

 
 

From: DENNIS EASTERLING =
Sent: Friday, July 05, 2013 5:26 PM
Subject: Re: LF: Wellbrook RX loops

Hi = Roger
  I use a Wellbrook Loop type ALA1530 = (MW/HF)  mounted 1m off the ground and a PA0RDT = mini-whip=20 mounted about 7m above ground.   Sometimes the loop wins = other=20 times the miniwhip.   The miniwhip is omnidirectional and uses = the e=20 field, whereas the loop is directional and uses the magnetic = field.  =20 The miniwhip is more open to BC breakthough than the loop but more=20 sensitive.   I tend to monitor with the miniwhip, and switch = to the=20 loop after homing in on the signal if this helps.   BC = breakthough is=20 overcome using a simple series LC circuit tuned to the required band at = the RX=20 end of the coax.   The QRM at my QRT can be horrendous, as I = am only=20 100 yards from the OH lines on the East Coast main railway line, = surrounded by=20 houses and a block of flats with associated busy roads.   My = 'T'=20 transmitting aerial 8m high is useless for RX.   I can = fully=20 recommend both miniwhip and Wellbrook Loop, both of which cover from LF = to=20 10m.   For best results, I suppose a tuned loop about 1m=20 square has the edge, but not as convenient.    73 Dennis M0JXM

From: Roger = Lapthorn=20 <rogerlapthorn@gmail.com>
To: = "rsgb_lf_group@blacksheep.org"=20 <rsgb_lf_group@blacksheep.org>; rsgb_lf_group@yahoogroups.co.uk=20
Sent: Friday, 5 July = 2013,=20 7:00
Subject: LF: = Wellbrook RX=20 loops

Can anyone advise, from actual = use,  how=20 well a Wellbrook loop works on 136 and 472kHz RX ? The excellent OIP2 = and OIP3=20 figures and directivity suggest one could be very useful. =

73s
Roger=20 G3XBM


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