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boundary="893906369-478872162-1317147846=:59346" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=1.0 required=5.0 tests=FORGED_YAHOO_RCVD,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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:483454208:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d007.2 ; domain : yahoo.com DKIM : fail x-aol-sid: 3039ac1d60554e82151369be X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --893906369-478872162-1317147846=:59346 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Hi Joze,=0A=A0=0Alooks like in your antenna the coil is wound over the shie= ld, am I correct?=0A=A0=0ARegards=0ADaniele=0A=A0=0A=0ADa: Joze Konda - S52= AB <s52ab@siol.com>=0AA: rsgb_lf_group@blacksheep.org=0AInviato: Marted=EC = 27 Settembre 2011 19:42=0AOggetto: Re: LF: Re: My first ferrite experiments= =0A=0A=0AHI Daniele=0A=A0=0AThis is my great ferrite rood RX antenna with a= luminium shield:=0Ahttp://lea.hamradio.si/~s52ab/ndb_equipment/slides/great= _fer_rood.html=0AGood worked.=0A=A0=0ARegards=0A=A0=0A73, Joze s52ab=0A=A0= =0A=A0=0A----- Original Message ----- =0A>From: Daniele Tincani =0A>To: rsg= b_lf_group@blacksheep.org =0A>Sent: Tuesday, September 27, 2011 5:15 PM=0A>= Subject: Re: LF: Re: My first ferrite experiments=0A>=0A>=0A>Hello Stefan,= =0A>=A0=0A>> but maybe the Q is reduced by the aluminium shield! =0A>Do you= think the aluminium could be the problem or the distance between the coil = and the core? I could replace the aluminium tube with a plastic tube, if sh= ielding is not necessary, but this would not improve the Q if the problem i= s the gap between the coil and the core.=0A>=A0=0A>> Are the rods galvanica= lly separated from each other by a thin plastic tape? What type is the ferr= ite material?=0A>Yes I put two layers of plastic tape on tips of each rod. = The ferrite material is russian MU400HH.=0A>=A0=0A>Best regards=0A>Daniele= =0A>=A0=0A>=0A>=0A>Da: Stefan Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg= .de>=0A>A: rsgb_lf_group@blacksheep.org=0A>Inviato: Marted=EC 27 Settembre = 2011 13:48=0A>Oggetto: Re: LF: Re: My first ferrite experiments=0A>=0A>=0A>= Hello Daniele, =0A>=0A>Nice work and good equipment.=0A>I would suggest to = make the wires between coil and cap as short as possible and not to use the= se crocodile clamps. HF litz wire should help about the Q but maybe the Q i= s reduced by the aluminium shield! Are the rods galvanically separated from= each other by a thin plastic tape? What type is the ferrite material? =0A>= =0A>73, Stefan/DK7FC=0A>=0A>PS: Tell me if you need a test signal ;-)=0A>= =0A>Am 27.09.2011 12:33, schrieb Daniele Tincani: =0A>Pics 3 and 4 are atta= ched here.=0A>>=A0=0A>>=0A>>=0A>>Da: Daniele Tincani <danieletincani@yahoo.= com>=0A>>A: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>= =0A>>Inviato: Marted=EC 27 Settembre 2011 12:31=0A>>Oggetto: My first ferri= te experiments=0A>>=0A>>=0A>>=0A>>=0A>>Hello LF,=0A>>=0A>>=0A>>this evening= I had some free time to spend for starting my very simple tests with ferri= te rods. Picture 1 in the attached zip file shows one of the rods (about 10= mm diameter x 200mm long) together with a short piece of plastic tube that = I have used to adapt the rods to a larger-diameter slotted aluminium tube -= =A0shown in picture 2. As you can see, the longitudinal cut on the tube is = not really regular and "clean". I'm not very good at working with metals. N= evertheless, I hope it will do the job, that is acting as a shield between = the rods and the coil. Picture=A03 shows two of the three rods I used, each= inserted=A0in a short piece of plastic pipe and protected with heat shrink= tube and some masking tape.=0A>>Finally, picture=A04 shows the=A0very prov= isional setup that I used to try measuring Q of an LC pair composed by a 2-= gangs variable capacitor plus a 55-turns coil wound over the aluminium tube= containing the ferrite rods. I performed several measures, with 1, 2 or 3 = rods inside the tube. I saw that using 3 rods increases the inductance sign= ificantly. For example,=A0at an intermediate position of the varcap, resona= nce was at 1037KHz with only 1 rod inside the tube, but it was at 767 KHz w= ith 3 rods.The=A0Q value also increases slightly using 3 rods, even thought= in my tests I got only=A0a miserable figure of about 30. Anyway, I=A0 deci= ded to go with 3 rods for my next step, that will be to try Litz wire for t= he coil and see what happens.=0A>>=0A>>Note: pics 3 and 4 will be attached = to a re-sent of this message.=0A>>=0A>>Regards=0A>>D.=0A>>=0A>>=0A>>=0A>>= =0A>>=0A>>=0A>>=0A>>=0A>>=0A>>=0A>=0A>=0A>No virus found in this message.= =0A>Checked by AVG - www.avg.com=0A>Version: 10.0.1410 / Virus Database: 15= 20/3921 - Release Date: 09/26/11 --893906369-478872162-1317147846=:59346 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable <html><body><div style=3D"color:#000; background-color:#fff; font-family:ar= ial, helvetica, sans-serif;font-size:10pt"><div style=3D"RIGHT: auto"><SPAN= style=3D"RIGHT: auto">Hi Joze,</SPAN></div> <div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto"></SPAN> </div> <div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto">looks like in your a= ntenna <VAR id=3Dyui-ie-cursor></VAR>the coil is wound over the shield, am = I correct?</SPAN></div> <div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto"></SPAN> </div> <div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto">Regards</SPAN></div> <div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto">Daniele</SPAN></div> <div style=3D"RIGHT: auto"><SPAN style=3D"RIGHT: auto"></SPAN> </div> <div><BR></div> <DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif"> <DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, time= s, serif"><FONT face=3DArial size=3D2> <DIV class=3Dhr style=3D"BORDER-RIGHT: #ccc 1px solid; PADDING-RIGHT: 0px; = BORDER-TOP: #ccc 1px solid; PADDING-LEFT: 0px; FONT-SIZE: 0px; PADDING-BOTT= OM: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADD= ING-TOP: 0px; BORDER-BOTTOM: #ccc 1px solid; HEIGHT: 0px" readonly=3D"true"= contenteditable=3D"false"></DIV><B><SPAN style=3D"FONT-WEIGHT: bold">Da:</= SPAN></B> Joze Konda - S52AB <s52ab@siol.com><BR><B><SPAN style=3D"FO= NT-WEIGHT: bold">A:</SPAN></B> rsgb_lf_group@blacksheep.org<BR><B><SPAN sty= le=3D"FONT-WEIGHT: bold">Inviato:</SPAN></B> Marted=EC 27 Settembre 2011 19= :42<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Oggetto:</SPAN></B> Re: LF: Re:= My first ferrite experiments<BR></FONT><BR> <META http-equiv=3Dx-dns-prefetch-control content=3Doff> <DIV id=3Dyiv1120595325> <STYLE></STYLE> <DIV><FONT face=3DArial size=3D2>HI Daniele</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>This is my great ferrite rood RX antenna w= ith aluminium shield:</FONT></DIV> <DIV><FONT face=3DArial size=3D2><A href=3D"http://lea.hamradio.si/~s52ab/n= db_equipment/slides/great_fer_rood.html" target=3D_blank rel=3Dnofollow>htt= p://lea.hamradio.si/~s52ab/ndb_equipment/slides/great_fer_rood.html</A></FO= NT></DIV> <DIV><FONT face=3DArial size=3D2>Good worked.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Regards</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>73, Joze s52ab</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <BLOCKQUOTE dir=3Dltr style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGI= N-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial"><B>From:</B> <A title= =3Ddanieletincani@yahoo.com href=3D"mailto:danieletincani@yahoo.com" target= =3D_blank rel=3Dnofollow ymailto=3D"mailto:danieletincani@yahoo.com">Daniel= e Tincani</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Drsgb_lf_group@blacksh= eep.org href=3D"mailto:rsgb_lf_group@blacksheep.org" target=3D_blank rel=3D= nofollow ymailto=3D"mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blac= ksheep.org</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, September 27, 2011 5:= 15 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: LF: Re: My first ferrit= e experiments</DIV> <DIV><BR></DIV> <DIV style=3D"FONT-SIZE: 10pt; COLOR: #000; FONT-FAMILY: arial, helvetica, = sans-serif; BACKGROUND-COLOR: #fff"> <DIV id=3Dyiv1120595325> <DIV style=3D"FONT-SIZE: 10pt; COLOR: #000; FONT-FAMILY: arial, helvetica, = sans-serif; BACKGROUND-COLOR: #fff"> <DIV id=3Dyiv1120595325yui_3_2_0_14_131713566775043><SPAN id=3Dyiv112059532= 5yui_3_2_0_14_131713566775057>Hello Stefan,</SPAN></DIV> <DIV><SPAN id=3Dyiv1120595325yui_3_2_0_14_1317135667750107></SPAN> </D= IV> <DIV id=3Dyiv1120595325yui_3_2_0_14_1317135667750132><SPAN id=3Dyiv11205953= 25yui_3_2_0_14_1317135667750134>> but maybe the Q is reduced by the alum= inium shield! </SPAN></DIV> <DIV><SPAN id=3Dyiv1120595325yui_3_2_0_14_1317135667750148>Do you think the= aluminium could be the problem or the distance between the coil and the co= re? I could replace the aluminium tube with a plastic tube, if shielding is= not necessary, but this would not improve the Q if the problem is the gap = between the coil and the core.</SPAN></DIV> <DIV><SPAN id=3Dyiv1120595325yui_3_2_0_14_13171356677501155></SPAN> </= DIV> <DIV id=3Dyiv1120595325yui_3_2_0_14_13171356677501281><SPAN id=3Dyiv1120595= 325yui_3_2_0_14_13171356677501283>> Are the rods galvanically separated = from each other by a thin plastic tape? What type is the ferrite material?<= /SPAN></DIV> <DIV><SPAN id=3Dyiv1120595325yui_3_2_0_14_13171356677501306>Yes I put two l= ayers of plastic tape on tips of each rod. The ferrite material is russian = MU400HH.</SPAN></DIV> <DIV><SPAN></SPAN> </DIV> <DIV><SPAN>Best regards</SPAN></DIV> <DIV><SPAN>Daniele</SPAN></DIV> <DIV><SPAN><VAR id=3Dyiv1120595325yui-ie-cursor></VAR></SPAN> </DIV> <DIV><BR id=3Dyiv1120595325yui_3_2_0_14_131713566775045></DIV> <DIV id=3Dyiv1120595325yui_3_2_0_14_131713566775047 style=3D"FONT-SIZE: 10p= t; FONT-FAMILY: arial, helvetica, sans-serif"> <DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, time= s, serif"><FONT face=3DArial size=3D2> <DIV class=3D"yiv1120595325hr yiv1120595325yui-non yiv1120595325yui-skip" i= d=3Dyiv1120595325yui_3_2_0_14_131713566775055 style=3D"BORDER-RIGHT: #ccc 1= px solid; PADDING-RIGHT: 0px; BORDER-TOP: #ccc 1px solid; PADDING-LEFT: 0px= ; FONT-SIZE: 0px; PADDING-BOTTOM: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1= px solid; LINE-HEIGHT: 0; PADDING-TOP: 0px; BORDER-BOTTOM: #ccc 1px solid; = HEIGHT: 0px"></DIV><B><SPAN style=3D"FONT-WEIGHT: bold">Da:</SPAN></B> Stef= an Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg.de><BR><B><SPAN styl= e=3D"FONT-WEIGHT: bold">A:</SPAN></B> rsgb_lf_group@blacksheep.org<BR><B><S= PAN style=3D"FONT-WEIGHT: bold">Inviato:</SPAN></B> Marted=EC 27 Settembre = 2011 13:48<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Oggetto:</SPAN></B> Re: = LF: Re: My first ferrite experiments<BR></FONT><BR> <DIV id=3Dyiv1120595325>Hello Daniele, <BR><BR>Nice work and good equipment= .<BR>I would suggest to make the wires between coil and cap as short as pos= sible and not to use these crocodile clamps. HF litz wire should help about= the Q but maybe the Q is reduced by the aluminium shield! Are the rods gal= vanically separated from each other by a thin plastic tape? What type is th= e ferrite material? <BR><BR>73, Stefan/DK7FC<BR><BR>PS: Tell me if you need= a test signal ;-)<BR><BR>Am 27.09.2011 12:33, schrieb Daniele Tincani:=20 <BLOCKQUOTE type=3D"cite"> <DIV style=3D"FONT-SIZE: 10pt; COLOR: rgb(0,0,0); FONT-FAMILY: arial, helve= tica, sans-serif; BACKGROUND-COLOR: rgb(255,255,255)"> <DIV><SPAN>Pics 3 and 4 are <VAR id=3Dyiv1120595325yui-ie-cursor></VAR>atta= ched here.</SPAN></DIV> <DIV><SPAN></SPAN> </DIV> <DIV><BR></DIV> <DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif"> <DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, time= s, serif"><FONT face=3DArial size=3D2><B><SPAN style=3D"FONT-WEIGHT: bold">= Da:</SPAN></B> Daniele Tincani <A class=3Dyiv1120595325moz-txt-link-rfc2396= E href=3D"mailto:danieletincani@yahoo.com" target=3D_blank rel=3Dnofollow y= mailto=3D"mailto:danieletincani@yahoo.com"><danieletincani@yahoo.com>= </A><BR><B><SPAN style=3D"FONT-WEIGHT: bold">A:</SPAN></B> <A class=3Dyiv11= 20595325moz-txt-link-rfc2396E href=3D"mailto:rsgb_lf_group@blacksheep.org" = target=3D_blank rel=3Dnofollow ymailto=3D"mailto:rsgb_lf_group@blacksheep.o= rg">"rsgb_lf_group@blacksheep.org"</A> <A class=3Dyiv1120595325moz-txt-link= -rfc2396E href=3D"mailto:rsgb_lf_group@blacksheep.org" target=3D_blank rel= =3Dnofollow ymailto=3D"mailto:rsgb_lf_group@blacksheep.org"><rsgb_lf_gro= up@blacksheep.org></A><BR><B><SPAN style=3D"FONT-WEIGHT: bold">Inviato:<= /SPAN></B> Marted=EC 27 Settembre 2011 12:31<BR><B><SPAN style=3D"FONT-WEIG= HT: bold">Oggetto:</SPAN></B> My first ferrite experiments<BR></FONT><BR> <DIV id=3Dyiv1120595325> <DIV style=3D"FONT-SIZE: 10pt; COLOR: rgb(0,0,0); FONT-FAMILY: arial, helve= tica, sans-serif; BACKGROUND-COLOR: rgb(255,255,255)"> <DIV><SPAN></SPAN></DIV> <DIV> </DIV> <DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif"> <DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, time= s, serif"> <DIV id=3Dyiv1120595325> <DIV style=3D"FONT-SIZE: 10pt; COLOR: rgb(0,0,0); FONT-FAMILY: arial, helve= tica, sans-serif; BACKGROUND-COLOR: rgb(255,255,255)"> <DIV>Hello LF,</DIV> <DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, sans-serif"> <DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, time= s, serif"> <DIV id=3Dyiv1120595325> <DIV style=3D"FONT-SIZE: 10pt; COLOR: rgb(0,0,0); FONT-FAMILY: arial, helve= tica, sans-serif; BACKGROUND-COLOR: rgb(255,255,255)"> <DIV> </DIV> <DIV>this evening I had some free time to spend for starting my very simple= tests with ferrite rods. Picture 1 in the attached zip file shows one of t= he rods (about 10mm diameter x 200mm long) together with a short piece of p= lastic tube that I have used to adapt the rods to a larger-diameter slotted= aluminium tube - shown in picture 2. As you can see, the longitudinal= cut on the tube is not really regular and "clean". I'm not very good at wo= rking with metals. Nevertheless, I hope it will do the job, that is acting = as a shield between the rods and the coil. Picture 3 shows two of the = three rods I used, each inserted in a short piece of plastic pipe and = protected with heat shrink tube and some masking tape.</DIV> <DIV>Finally, picture 4 shows the very provisional setup that I u= sed to try measuring Q of an LC pair composed by a 2-gangs variable capacit= or plus a 55-turns coil wound over the aluminium tube containing the ferrit= e rods. I performed several measures, with 1, 2 or 3 rods inside the tube. = I saw that using 3 rods increases the inductance significantly. For example= , at an intermediate position of the varcap, resonance was at 1037KHz = with only 1 rod inside the tube, but it was at 767 KHz with 3 rods.The = ;Q value also increases slightly using 3 rods, even thought in my tests I g= ot only a miserable figure of about 30. Anyway, I decided to go = with 3 rods for my next step, that will be <VAR id=3Dyiv1120595325yui-ie-cu= rsor></VAR>to try Litz wire for the coil and see what happens.</DIV> <DIV> </DIV> <DIV>Note: p<VAR id=3Dyiv1120595325yui-ie-cursor></VAR>ics 3 and 4 will be = attached to a re-sent of this message.</DIV> <DIV> </DIV> <DIV>Regards</DIV> <DIV>D.<BR><BR><BR><BR></DIV></DIV></DIV><BR><BR></DIV></DIV></DIV></DIV><B= R><BR></DIV></DIV></DIV></DIV><BR><BR></DIV></DIV></DIV></BLOCKQUOTE></DIV>= <BR><BR></DIV></DIV></DIV></DIV> <DIV></DIV></DIV> <DIV class=3Dhr style=3D"BORDER-RIGHT: #ccc 1px solid; PADDING-RIGHT: 0px; = BORDER-TOP: #ccc 1px solid; PADDING-LEFT: 0px; FONT-SIZE: 0px; PADDING-BOTT= OM: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADD= ING-TOP: 0px; BORDER-BOTTOM: #ccc 1px solid; HEIGHT: 0px" readonly=3D"true"= contenteditable=3D"false"></DIV><A rel=3Dnofollow></A> <div class=3Dyiv1120595325avgcert align=3Dleft>No virus found in this messa= ge.<BR>Checked by AVG - <A href=3D"http://www.avg.com/" target=3D_blank rel= =3Dnofollow>www.avg.com</A><BR>Version: 10.0.1410 / Virus Database: 1520/39= 21 - Release Date: 09/26/11</div></BLOCKQUOTE></DIV> <META http-equiv=3Dx-dns-prefetch-control content=3Don><BR><BR></DIV></DIV>= </div></body></html> --893906369-478872162-1317147846=:59346--