Topband: best core material?

[Charlie Cunningham]

By the way, Jim. My loop was only about 3' high on the bottom 40' run and
about 13' at the apex.

Charlie, K4OTV

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of James
Rodenkirch
Sent: Monday, August 05, 2013 3:23 PM
To: topband at contesting.com
Subject: Re: Topband: best core material?

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
> > >
> > >
> > >
> > > _________________
> > > 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