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Content preview: Alan; From my broadcast experience and taking field strength measurements-frozen ground can over double the normal warmer weather conductivity which would not be even close to the salt water conductivity of 5000 mmohs per meter of salt water-Bob [...] Content analysis details: (-0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [65.55.116.23 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rjraide[at]hotmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 131286aabc28dd54c072e5e89638c651 Content-Type: multipart/alternative; boundary="_9d8df848-e595-4b74-9341-5ea5af87ca74_" Subject: RE: LF: Ant current X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=FORGED_HOTMAIL_RCVD, 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 --_9d8df848-e595-4b74-9341-5ea5af87ca74_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Alan=3B >From my broadcast experience and taking field strength measurements-frozen = ground can over double the normal warmer weather conductivity which would n= ot be even close to the salt water conductivity of 5000 mmohs per meter of = salt water-Bob=20 =20 > From: alan.melia@btinternet.com > To: rsgb_lf_group@blacksheep.org > Date: Sat=2C 1 Feb 2014 20:08:58 +0000 > Subject: Re: LF: Ant current >=20 > Why? > I think its possible that frozen ground increases the efficincy of a give= n=20 > system=2C but that same antenna conguration would probably work even bett= er=20 > still over salt water?? >=20 > Alan > G3NYK > ----- Original Message -----=20 > From: "C. Groeger" > To: > Sent: Saturday=2C February 01=2C 2014 3:18 PM > Subject: Re: LF: Ant current >=20 >=20 > > Thanks for quick reply=2C Wolf! > > > > But then propagation from a mf tx on a ship on sea should be worse then= =20 > > from land? > > > > Christian Groeger > > > > wolf_dl4yhf schrieb: > > > >>Hi Chris=2C > >> > >>By coincidence=2C I just had to re-adjust the antenna for exactly that= =20 > >>reason: > >> > >>The conductivity of water is better=2C but the 'tangens delta' (loss > >>factor) of water as dielectric is much worse than that of ice. > >>So the water "robs" energy in presence of an E-field=2C which the ice d= oes > >>not. > >>Thus the losses around the antenna go up. Depends a lot of the greenery > >>around the antenna. > >> > >>Cheers=2C > >> Wolf DL4YHF . > >> > >>Am 01.02.2014 15:51=2C schrieb C. Groeger: > >>> Hi all > >>> How can one explain that ant current rises when soil is frozen? > >>> > >>> Conductivity of water should be much higher than that of ice. > >>> > >>> So earth resistance would be higher and the current should drop when= =20 > >>> soil is frozen... > >>> > >>> 73=2C df5qg > >>> > >>> > >>> Christian Groeger > >> > >> > >=20 >=20 >=20 = --_9d8df848-e595-4b74-9341-5ea5af87ca74_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Alan=3B
From my broadcast exp= erience and taking field strength measurements-frozen ground can over doubl= e the normal warmer weather conductivity which would not be even close to t= he salt water conductivity of 5000 mmohs per meter of salt water-Bob
&n= bsp=3B
>=3B From: alan.melia@btinternet.com
>=3B To: rsgb_lf= _group@blacksheep.org
>=3B Date: Sat=2C 1 Feb 2014 20:08:58 +0000
&= gt=3B Subject: Re: LF: Ant current
>=3B
>=3B Why?
>=3B I th= ink its possible that frozen ground increases the efficincy of a given
= >=3B system=2C but that same antenna conguration would probably work even= better
>=3B still over salt water??
>=3B
>=3B Alan
>= =3B G3NYK
>=3B ----- Original Message -----
>=3B From: "C. Groeg= er" <=3Baot.aot@gmx.de>=3B
>=3B To: <=3Brsgb_lf_group@blacksheep= .org>=3B
>=3B Sent: Saturday=2C February 01=2C 2014 3:18 PM
>= =3B Subject: Re: LF: Ant current
>=3B
>=3B
>=3B >=3B Tha= nks for quick reply=2C Wolf!
>=3B >=3B
>=3B >=3B But then pro= pagation from a mf tx on a ship on sea should be worse then
>=3B >= =3B from land?
>=3B >=3B
>=3B >=3B Christian Groeger
>= =3B >=3B
>=3B >=3B wolf_dl4yhf <=3Bdl4yhf@freenet.de>=3B schri= eb:
>=3B >=3B
>=3B >=3B>=3BHi Chris=2C
>=3B >=3B>= =3B
>=3B >=3B>=3BBy coincidence=2C I just had to re-adjust the ant= enna for exactly that
>=3B >=3B>=3Breason:
>=3B >=3B>=3B=
>=3B >=3B>=3BThe conductivity of water is better=2C but the 'tang= ens delta' (loss
>=3B >=3B>=3Bfactor) of water as dielectric is mu= ch worse than that of ice.
>=3B >=3B>=3BSo the water "robs" energy= in presence of an E-field=2C which the ice does
>=3B >=3B>=3Bnot.=
>=3B >=3B>=3BThus the losses around the antenna go up. Depends a = lot of the greenery
>=3B >=3B>=3Baround the antenna.
>=3B >= =3B>=3B
>=3B >=3B>=3BCheers=2C
>=3B >=3B>=3B Wolf DL4= YHF .
>=3B >=3B>=3B
>=3B >=3B>=3BAm 01.02.2014 15:51=2C s= chrieb C. Groeger:
>=3B >=3B>=3B>=3B Hi all
>=3B >=3B>= =3B>=3B How can one explain that ant current rises when soil is frozen?>=3B >=3B>=3B>=3B
>=3B >=3B>=3B>=3B Conductivity of wa= ter should be much higher than that of ice.
>=3B >=3B>=3B>=3B>=3B >=3B>=3B>=3B So earth resistance would be higher and the curr= ent should drop when
>=3B >=3B>=3B>=3B soil is frozen...
>= =3B >=3B>=3B>=3B
>=3B >=3B>=3B>=3B 73=2C df5qg
>=3B &= gt=3B>=3B>=3B
>=3B >=3B>=3B>=3B
>=3B >=3B>=3B>=3B= Christian Groeger
>=3B >=3B>=3B
>=3B >=3B>=3B
>=3B = >=3B
>=3B
>=3B
= --_9d8df848-e595-4b74-9341-5ea5af87ca74_--