[Antennas] Question reg. multiband dipole - balun

Wed, 20 Feb 2002 01:59:23 +0100

Hi everybody,

thanks for the comments I got...

But these comments raised new questions:

- Do I still need the 1:4 Balun if I am going to use ladder line all the 
way to the tuner? The tuner (Vectronics 300 W tuner) has an integrated 1:4 
Balun (but it is probably too weak :( ) Currently I am using this tuner (in 
coax mode) with abt. 350 W SSB and it is working flawlessly...But I doubt 
that it will work with the integrated Balun.

- Can I use the Balun (1:4) inside the house and connect it to the COAX 
input of the tuner with a very very short cable? Does that have any effect 
on the rf distribution?

- One user suggested that I should run two coax cables to the balun? Which 
connector do I have to use at the tuner? Balanced or unbalanced... I think 
unbalanced (the balanced line is unbalanced through the balun)... But why 
do I have to run two cables?

- Imagine the following situation (pretty similar to #1): I use ladder line 
all the way from the antenna to the tuner. The integrated balun is too 
weak. Therefore I want to use a stronger one. How can I connect this balun 
to the tuner to have full tuning possibilies (which is necessary because 
the antenna itself is not resonant on all bands)

Sorry for these really silly questions but I really want to make this thing 
work "perfect". It is an antenna for a holiday QTH and therefore I can't 
test it here under the conditions I find there.

I have tons of literature abt. antennas... but none has really covered this 
topic... Seems not very common.

Thanks!

73
Christian, DL6KAC

At 00:05 20.02.2002, you wrote:
>One more thing: connect the shields to the tuner chassis or station ground
>point and leave them unconnected, except to each other, at the other end .
>. . and you do not have to keep the coax lines close together or anything
>like that. They can run anywhere relative to one another with no ill
>effects.
>
>72/73/oo, George W5YR - the Yellow Rose of Texas
>Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
>Amateur Radio W5YR, in the 56th year and it just keeps getting better!
>QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771
>Icom IC-756PRO #02121  Kachina #91900556  IC-765 #02437
>
>All outgoing email virus-checked by Norton Anti-Virus 2002
>
>
>k9wkj wrote:
> >
> > this should be easy
> > make a short piece of ladder line out of two pieces of coax
> > ground the shields toghther and run it through the window connect the
> > ladderline on the out side and bingo you are through the window  the
> > small impeadence lump you will get wont bother at all          try to
> > keep your ladderline at least 1/2 wave on the lowest freq you will use
> > that will keep the current point outside
> > hope that helps
>
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