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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 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 [...] 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 [212.82.99.227 listed in list.dnswl.org] 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: b8b011f938af8abc4b241335cabd0691 Subject: Re: LF: Wellbrook RX loops Content-Type: multipart/alternative; boundary="-1780992897-1406404825-1373041563=:73092" 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: 3343 ---1780992897-1406404825-1373041563=:73092 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi Roger=0A=A0=0AI use a Wellbrook Loop type ALA1530 (MW/HF)=A0=A0mounted 1= m off the ground and a PA0RDT mini-whip mounted about=A07m above ground.=A0= =A0 Sometimes the loop wins other times the miniwhip.=A0=A0 The miniwhip is= omnidirectional and uses the e field, whereas the loop is directional and = uses the magnetic field.=A0=A0 The miniwhip is more open to BC breakthough = than the loop but more sensitive.=A0=A0 I tend to monitor with the miniwhip= , and switch to the loop after homing in on the signal if this helps.=A0=A0= BC breakthough is overcome using a simple series LC circuit tuned to the r= equired band at the RX end of the coax.=A0=A0 The QRM at my QRT can be horr= endous, as I am only 100 yards from the OH lines on the East Coast main rai= lway line, surrounded by houses and a block of flats with associated busy r= oads.=A0=A0 My 'T' transmitting aerial 8m high is useless for RX.=A0=A0=A0I= can fully recommend both miniwhip and Wellbrook Loop, both of which cover = from LF to 10m.=A0=A0 For best results, I suppose a tuned loop about 1m square=A0has the edge, but not as= convenient.=A0=0A=A0=0A73 Dennis M0JXM=0A=0AFrom: Roger Lapthorn =0ATo: "rsgb_lf_group@blacksheep.org" ; rsgb_lf_group@yahoogroups.co.uk =0ASent: Friday, 5 July 2013, 7:= 00=0ASubject: LF: Wellbrook RX loops=0A=0A=0ACan anyone advise, from actual= use,=A0 how well a Wellbrook loop works on 136 and 472kHz RX ? The excelle= nt OIP2 and OIP3 figures and directivity suggest one could be very useful. = =0A=0A73s=0ARoger G3XBM ---1780992897-1406404825-1373041563=:73092 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Hi Roger
 
I use a Wellbrook Loop type A= LA1530 (MW/HF)  mounted 1m off the = ground and a PA0RDT mini-whip mounted about 7m above ground. &nbs= p; Sometimes the loop wins other times the miniwhip.   The miniwh= ip is omnidirectional and uses the e field, whereas the loop is directional= and uses the magnetic field.   The miniwhip is more open to BC b= reakthough 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 bloc= k of flats with associated busy roads.   My 'T' transmitting aeri= al 8m high is useless for RX.   I can fully recommend both m= iniwhip 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@gm= ail.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 a= nd OIP3 figures and directivity suggest one could be very useful.

7= 3s
Roger G3XBM


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