What's wrong with another Balun at the vertical. There would then be
two baluns - one at each end of the open wire line.
Carl Moreschi N4PY
121 Little Bell Dr.
Hays, NC 28635
www.n4py.com
On 1/27/2012 12:19 AM, Rick - DJ0IP / NJ0IP wrote:
> I agree Jim, but are you implying that you cannot use openwire to feed an
> unbalanced antenna?
> What about the original Zepp?
> It was 100% unbalanced. One of the two lines was left open at the antenna
> end.
>
> The whole point (IMO) of using openwire these days is to reduce loss.
> Otherwise we would just use coax.
>
> Another Example: Vertical dipole, non-resonant, base about 5 ft. off the
> ground, center-fed with openwire.
> This is an antenna I've used for some 20 years.
> OBVIOUSLY, it is not 100% balanced because one side is so much closer to the
> ground.
> Running this antenna on 80m from Oklahoma, I was easily working any
> continent in the world.
> I'm not sure I would have had those results using coax.
> (the dipole was only 9m per side).
>
> In my opinon, openwire is an excellent feedline to use, even when the
> antenna is not perfectly balanced.
>
> 73
> Rick, DJ0IP
>
>
>
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of Jim Brown
> Sent: Thursday, January 26, 2012 11:09 PM
> To: tentec@contesting.com
> Subject: Re: [TenTec] Re. [Ten Tec] --- and balanced fed verticals
>
> On 1/26/2012 12:36 PM, Stuart Rohre wrote:
>> I agree with you, but the original post defined a possibly balanced or
>> near balanced vertical system, a quarter wave antenna with at least two
>> radials. (This was the classic RCA design by Brown et al, when the
>> ground plane antenna as it came to be called was invented.) (Later the
>> marketing department wanted and added more radials
>> "to look more symmetrical".)
>
> But this antenna is NOT balanced -- the radials have a MUCH MUCH LOWER
> impedance to earth than the vertical element. It is a GOOD antenna, but
> it is NOT a BALANCED antenna.
>
> 73, Jim Brown K9YC
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