Check this link out. It works flawlessly.
audiosystemsgroup.com/*RFI*-Ham.pdf
On Thu, Oct 24, 2013 at 7:47 PM, Charlie Cunningham <
charlie-cunningham@nc.rr.com> wrote:
> That would work as well. I used something similar, but with less turns to
> precede the 4:1 current balun feeding the drivers on my home brew 5-band
> quad.
>
> Charlie, K4OTV
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Jim
> Bennett
> Sent: Thursday, October 24, 2013 7:41 PM
> To: Gary@ka1j.com
> Cc: topband@contesting.com
> Subject: Re: Topband: Balun question
>
> I was just looking through the ARRL Antenna Book - if it's RG-8, then 8
> turns would work if wound on an 8 inch PVC tube. However, that size PVC may
> be difficult to find, and certainly wouldn't be to spiffy hung way up the
> air. But then again, you were thinking about 10 turns on a 12 inch diameter
> form...? I assume you were going to place it at the apex of the Inverted
> Vee, right? An alternative would be to get 5 mix 31 ferrite cores, 2.4 inch
> OD and pass the coax through it six times. That ought to get about 5,000
> ohm
> impedance at 3.5 MHz and would do the trick. I'm using exactly that on my
> 80
> meter Inverted L and it does a fine job. Mouser has those cores for $6-$7
> each.
>
> Jim / W6JHB
>
>
> On Thursday, Oct 24, 2013, at Thursday, 4:25 PM, Gary Smith wrote:
>
> > Though this reflector is for 160M I have an 80M question that might be
> > best asked here. My father W1BML is on an 80 meter net nightly.
> > His antenna in an inv-V with 40 & 80 elements though he never uses 40
> > any more. I needed to fell a couple of trees to remove branches that
> > were touching his copperweld and the W2AU balun he had broke in two
> > during the process. (Don't ask, your imagination is probably correct)
> > :) And he would like it put back the way it was, with a balun. He's
> > 96 so I try to keep him happy.
> >
> > I'm thinking 10 or so rolls of coax around 1' in diameter ought to be
> > fine for a choke on 80. Any better suggestions?
> >
> > Thanks,
> >
> > Gary
> > KA1J
> > _________________
> > Topband Reflector
>
> _________________
> Topband Reflector
>
> _________________
> Topband Reflector
>
--
Randy Lake N1KWF
73 Gunn Rd.
Keene,NH
_________________
Topband Reflector
|