[NJARC] Antenna Balun

[Scott Roberts]

Al- A couple Quick Questions:
I see the 1:9 "UN-UN", but not a 9:1. I am assuming
they are one and the same. My question is, using the
orientation in the drawing, and using the upper right
as #1, going clockwise through #2,3,4, what are the
connections?  

Also, I have forgotten the meaning of the big black
dot next to each transformer.

And finally, are all three transformers 5 trifilar
turns? (3 pieces wire, twisted, passed through one
aperture of the core, with 5 reverses in direction?)

Thanks again-
Scott

--- Al Klase <al at ar88.net> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Scott,
> 
> For reference, go here
> http://www.skywaves.ar88.net/ANTENNA/antsys.htm 
> and open the "BALUNS" .pdf in the "Updated Info"
> box.
> 
> I'd start with the 9:1 "UN UN" as you're working
> with an antenna of a 
> random nature.  Of course connect the antenna to the
> top, the cable 
> shield to the bottom, and the center conductor to
> the low-Z tap.
> 
> As a further elaboration, if there's a ground near
> the feed point of the 
> antenna, you can try isolating the cable shield from
> the antenna by 
> adding a 1:1 current balun between the 1:9 and the
> cable.  See the upper 
> drawing under "Balun Applications"  This keeps noise
> picked up inside 
> the house by the cable shiewld from being applied to
> the antenna.
> 
> Al
> 
> Scott Roberts wrote:
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > This is mainly addressed towards Al, but I thought
> I'd
> > send it out in case anyone else has any ideas.
> >
> > Al-
> > I am getting ready to throw together a quick end
> feed
> > Slinky antenna, and was wondering which of your
> > Skywave or broadband transformer set ups would be
> best
> >  for what I want to do. This will be a temporary
> > setup, and I am hoping to set up something quick.
> I
> > plan to use RG-6 or RG-58 for the line in, and use
> it
> > just for receiving. I have printouts of the
> designs,
> > but am not sure which I should use. Slide 9 from
> your
> > demonstration the other month looks like what I'd
> like
> > to do for this, but I am not sure which design
> would
> > comprise the 4:1 balun shown.
> >
> > Later I intend to build a better setup.
> >
> > Scott
> >
> >
> >      
>
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> >
> >
> >   
> 
> -- 
> Al Klase - N3FRQ 
> Flemington, NJ 
> http://www.skywaves.ar88.net/
> 
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> 



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