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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: Hi Graham Don't bring measurement and practical Ham Radio comparisons into this you are fighting "Black Magic" and Voodoo. Its a commercial promotion and specmanship with no real technical data to make an evaluation. Never seen a schematic for one or an explanation why it would be better than a "proper" antenna, an elevated electrode tuned against ground on the frequency of interest. [...] 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 [77.238.189.206 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (m0fmt[at]yahoo.co.uk) 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: fce77e88417377663dedf94f027ec622 Subject: Re: LF: Wellbrook RX loops Content-Type: multipart/alternative; boundary="131296447-1342065471-1373065027=:23832" 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_FONT_BIG,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: 3346 --131296447-1342065471-1373065027=:23832 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi Graham=0A=0ADon't bring measurement and practical Ham Radio comparisons = into this you are fighting "Black Magic" and Voodoo. Its a commercial promo= tion and specmanship with no real technical data to make an evaluation. Nev= er seen a schematic for one=A0or an explanation=A0why it would be better th= an a "proper" antenna, an elevated electrode tuned against ground on the fr= equency of interest.=0A=0A73 es GL Pete M0FMT IO91UX=0A=0A=0A>_____________= ___________________=0A> From: Graham =0A>To: rsgb_= lf_group@blacksheep.org =0A>Sent: Friday, 5 July 2013, 19:33=0A>Subject: Fw= : LF: Wellbrook RX loops=0A> =0A>=0A>=0A>=0A>=0A>There=A0 is a=A0 good=A0= =A0 example=A0 of=A0 =0AMini-whip=A0=A0 V=A0 40 ft=A0 end fed=A0 vertical= =A0 , db =0Alevels=A0 are=A0 the=A0 average over=A0 32 mins=A0 , so=A0 =0At= hat=A0 would=A0 tend=A0 to=A0 give=A0 a=A0 =0Arealistic=A0=A0 evaluation=A0= , as opposed to=A0=A0peak=A0 , =0Awhich=A0 would=A0 reflect one=A0 major = =A0incident =0A=A0during=A0 the=A0 time lime =0A>=0A>Stations=A0 about=A0 = 25=A0 miles=A0 apart=A0 =0Awest<>east =0A>=0A>G.. =0A>=0A>23:02 136 G3XDV = de G4WGT Op32 160 mi -12 dB in Chorley, IO83qo with =0A0.3w + Inv-L23:02 13= 6 G3XDV de G0NBD Op32 163 mi -23 dB in Nr Liverpool with 0.3w =0A+ Inv-L = =0A>=0A>=0A>=0A> =0A>From: DENNIS EASTERLING =0A>Sent: Friday, July 05, 20= 13 5:26 PM =0A>To: rsgb_lf_group@blacksheep.org =0A>Subject: Re: LF: Wellb= rook RX loops =0A>=0A> =0A>Hi Roger =0A>=A0 =0A>I use a Wellbrook Loop type= ALA1530 (MW/HF)=A0=A0mounted 1m off the ground and a PA0RDT mini-whip =0Am= ounted about=A07m above ground.=A0=A0 Sometimes the loop wins other =0Atime= s the miniwhip.=A0=A0 The miniwhip is omnidirectional and uses the e =0Afie= ld, whereas the loop is directional and uses the magnetic field.=A0=A0 =0AT= he miniwhip is more open to BC breakthough than the loop but more =0Asensit= ive.=A0=A0 I tend to monitor with the miniwhip, and switch to the =0Aloop a= fter homing in on the signal if this helps.=A0=A0 BC breakthough is =0Aover= come using a simple series LC circuit tuned to the required band at the RX = =0Aend of the coax.=A0=A0 The QRM at my QRT can be horrendous, as I am only= =0A100 yards from the OH lines on the East Coast main railway line, surrou= nded by =0Ahouses and a block of flats with associated busy roads.=A0=A0 My= 'T' =0Atransmitting aerial 8m high is useless for RX.=A0=A0=A0I can fully = =0Arecommend both miniwhip and Wellbrook Loop, both of which cover from LF = to =0A10m.=A0=A0 For best results, I suppose a tuned loop about 1m =0Asquar= e=A0has the edge, but not as convenient.=A0 =0A>=A0 =0A>73 Dennis M0JXM =0A= >=0A> =0A>=0A>________________________________=0A>From: Roger Lapthorn =0A<= rogerlapthorn@gmail.com>=0A>To: "rsgb_lf_group@blacksheep.org" =0A; rsgb_lf_group@yahoogroups.co.uk =0A>Sent: Friday, 5 = July 2013, =0A7:00=0A>Subject: LF: Wellbrook RX =0Aloops=0A> =0A>=0A>Can an= yone advise, from actual use,=A0 how =0Awell a Wellbrook loop works on 136 = and 472kHz RX ? The excellent OIP2 and OIP3 =0Afigures and directivity sugg= est one could be very useful. =0A>=0A>73s=0A>Roger =0AG3XBM=0A>=0A>=0A> =0A= >=0A> --131296447-1342065471-1373065027=:23832 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
<= div style=3D"color: rgb(0, 0, 0); font-family: arial, helvetica, sans-serif= ; font-size: 14pt; background-color: rgb(255, 255, 255);">
Hi Graham
 
Don't bring measurement and practical Ham Radio co= mparisons into this you are fighting "Black Magic" and Voodoo. Its a commer= cial promotion and specmanship with no real technical data to make an evalu= ation. Never seen a schematic for one or an explanation w= hy it would be better than a "proper" antenna, an elevated electrode tuned = against ground on the frequency of interest.
73 es GL Pete M0FMT IO91UX
From: Graham <g8fzk@g8fzk.fsnet.co.uk>
To: rsgb_lf_group@blacksheep.org=
Sent: Friday, 5 July 2013, 19:33 Subject: Fw: LF: Wellbr= ook RX loops

=0A=0A =0A =0A
=0A
 
=0AThere  is a  good   example  of  =0AMini-w= hip   V  40 ft  end fed  vertical  , db =0Ale= vels  are  the  average over  32 mins  , so  = =0Athat  would  tend  to  give  a  =0Arealist= ic   evaluation  , as opposed to  peak  , =0A= which  would  reflect one  major  incident =0A dur= ing  the  time lime
=0A
 
=0A
Stations&nb= sp; about  25  miles  apart  =0Awest<>east
= =0A
 
=0A
G..
=0A
 
=0A
=0A
23:02 136 G3XDV de G4WGT Op32 160 mi -12 dB in Chorley, IO83qo with =0A0.3= w + Inv-L
=0A
23:02 136 G3XDV de G0NBD Op32 163 mi -23 dB in Nr = Liverpool with 0.3w =0A+ Inv-L
=0A
 <= /div>=0A
 
=0A
= =0A

=0A= =0A
Sent: Friday, July 05, 2013 5:26 PM
=0A=0A
Su= bject: Re: LF: Wellbrook RX loops
=0A

= =0A
=0A
Hi Roger
=0A
 
=0A
I use a Wellbrook Loop type ALA1530 (= MW/HF)  mounted 1m o= ff the ground and a PA0RDT mini-whip =0Amounted about 7m above ground.=    Sometimes the loop wins other =0Atimes the miniwhip. &nbs= p; The miniwhip is omnidirectional and uses the e =0Afield, whereas the loo= p is directional and uses the magnetic field.   =0AThe miniwhip i= s more open to BC breakthough than the loop but more =0Asensitive. &nb= sp; I tend to monitor with the miniwhip, and switch to the =0Aloop after ho= ming in on the signal if this helps.   BC breakthough is =0Aoverc= ome using a simple series LC circuit tuned to the required band at the RX = =0Aend of the coax.   The QRM at my QRT can be horrendous, as I a= m only =0A100 yards from the OH lines on the East Coast main railway line, = surrounded by =0Ahouses and a block of flats with associated busy roads.&nb= sp;  My 'T' =0Atransmitting aerial 8m high is useless for RX. &nb= sp; I can fully =0Arecommend both miniwhip and Wellbrook Loop, both of= which cover from LF to =0A10m.   For best results, I suppose a t= uned loop about 1m =0Asquare has the edge, but not as convenient. = ;
=0A
&nb= sp;
=0A
73 Dennis M0JXM=
=0A

=0A
=0A
=0A
=0A=
From: Roger Lapthorn =0A<rogerlapthorn@gmail.com>To: "rsgb_lf_group@blacks= heep.org" =0A<rsgb_lf_group@blacksheep.org>; rsgb_lf_group@yahoogroup= s.co.uk =0A
Sent: Frida= y, 5 July 2013, =0A7:00
Subject: LF: Wellbrook RX =0Aloops
=0A

Can anyone advise, from actual use,  how = =0Awell a Wellbrook loop works on 136 and 472kHz RX ? The excellent OIP2 an= d OIP3 =0Afigures and directivity suggest one could be very useful.
73s
Roger =0AG3XBM


=0A

--131296447-1342065471-1373065027=:23832--