Yes to both, Charlie - a friend of mine has a calculator to figure the exact turns ratio BUT, at a web site I found for this antenna (used during an FO0 dxpedition) the ratio was defined as 8 turns in the primary, 28 turns in the secondary (for 75 ohm cable so for 50 ohms it'll be something else but still fairly close to your mentioned 4:1 ratio)
> From: charlie-cunning...@nc.rr.com > To: rodenkirch_...@msn.com; ma...@isp.ca; topband@contesting.com > Date: Mon, 5 Aug 2013 14:24:05 -0400 > Subject: Re: Topband: best core material? > > BTW, Jim > > I assume that 18:1 is the impedance ratio, and the turns ratio is of the > order of 4:1 or so > > Charlie, K4OTV > > -----Original Message----- > From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of James > Rodenkirch > Sent: Monday, August 05, 2013 2:04 PM > To: BY THE LAKE; topband@contesting.com > Subject: Re: Topband: best core material? > > Sorry - didn't make it crystal clear that this is a Delta shaped variant of > a EWE antenna!!!! > > My bad for not utilizing all of the necessary verbiage to make that > clear....you see it in ON4UN's latest book on page 7-104. > > > > > > From: ma...@isp.ca > > To: rodenkirch_...@msn.com > > Subject: Re: Topband: best core material? > > Date: Mon, 5 Aug 2013 14:00:48 -0400 > > > > A full-wave delta loop would have the transformation done with a 1/4 wave > > line of 75 ohm cable. This must be something other than a full-wave loop? > > > > Bill VE3NH > > ----- Original Message ----- > > From: "James Rodenkirch" <rodenkirch_...@msn.com> > > To: <topband@contesting.com> > > Sent: Monday, August 05, 2013 1:33 PM > > Subject: Topband: best core material? > > > > > > > > > > I have a schematic for a delta shaped loop that shows I'll need an 18:1 > > > transformer to transform the 950 ohms of the antenna to 50 ohms (feeding > > > > it with 50 ohm coax). > > > > > > One transformer diagram shows an FT-140-43 core being used. > > > > > > BUT, looking over some of Tom's, W8JI, write-ups, I see where he uses 73 > > > > material instead. > > > > > > I see where 77 material replaced 73 material so -- is an FT-140-77 the > mo > > > betta way to go? > > > > > > > > > Thanks, in advance, for any advice/info. Jim Rodenkirch K9JWV > > > > > > > > > > > > _________________ > > > Topband Reflector > > > > > > > > > ----- > > > No virus found in this message. > > > Checked by AVG - www.avg.com > > > Version: 2013.0.3392 / Virus Database: 3209/6552 - Release Date: > 08/05/13 > > > > > > > > > > > ----- > > No virus found in this message. > > Checked by AVG - www.avg.com > > Version: 2013.0.3392 / Virus Database: 3209/6552 - Release Date: 08/05/13 > > > > _________________ > Topband Reflector > > _________________ > Topband Reflector _________________ Topband Reflector