Topband: best core material?

[James Rodenkirch]

Thanks to all that replied - VERY informative information as well as anecdotal evidence the small delta loop receive antenna works well AND at a lower height, which I was thinking of doing but not sure if that "mod" would alter the antenna's efficacy all that much!
 
Suggestion that I use a binocular core understood and I will go that route - a friend of mine will wind the binoc core for me (have severe neuropathy and can't handle small stuff like that at all!).
 
Great group of participants here - thank you for the advice/suggestions!
 
72, Jim Rodenkirch K9JWV
 


--- Original Message ----- 
> > From: "James Rodenkirch" <rodenkirch_llc at msn.com>
> > To: <topband at 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
> > >
> > >
> > >
> > > _________________
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