Yes, it is a very good choice, BUT by all means, you have to attach
the ladder line directly to your tuner.

You can add more ladderline, if you can order one with the length of
ladderline you need.
The ladderline is not easy to install because it must not be near to
metal objects. And you may cause interference problems to your close
neighbors.

Like I was saying, since you live in an appartment building, a coax
feedline will be easier to install. You will also avoid interference
with the neighbors with some sort of a good choke balun (current
balun) that will prevent the coax shield from radiating.

A trap dipole, that is resonnant on some bands will also reduce
interference due to the feedline, because it will keep swr low on the
coax.

So, an antenna such as the Van Gorden "All Bander" would be a
better choice? I have a tuner - LDG Z100 and I made a "Balun"
by making a 5" dia 12 turn coax choke. I kinda like the idea of
the all bander antenna because 1) it has more wire and 2) it has
a longer ladder line, allowing it to reach my window. That way,
my feedpoint would only be 7 feet from the tuner (less loss in
the rg-58 coax).

Ken KG0WX

you understand I meant that the choke balun has to be in the center
of the dipole

On Wed, 07 Jan 2004 15:04:50 -0500, Stef
wrote:

Yes, it is a very good choice, BUT by all means, you have to attach
the ladder line directly to your tuner.

Not really -- I use a coax choke balun to attach ladderline to my
tuner -- works fine for multi-band operation of my dipole.

Bob
k5qwg

ok, you're right but the coax choke is still attached right next to
your tuner isn't it? it's not 7 or 8 ft away from it? It shouldn't be
....

On Thu, 08 Jan 2004 09:33:25 -0500, Stef
wrote:

ok, you're right but the coax choke is still attached right next to
your tuner isn't it? it's not 7 or 8 ft away from it? It shouldn't be
...

The coax choke hangs just outside the window, so I don't have to bring
the ladderline into the shack. About 5 or 6 feet of rg-8x run inside
to the antenna tuner. The whole setup tunes a 44-ft dipole fine on 30m
thru 10M.

I'm not aware of what effect that short length of coax would have.

Bob
k5qwg

Bob Miller wrote:
The coax choke hangs just outside the window, so I don't have to bring
the ladderline into the shack. About 5 or 6 feet of rg-8x run inside
to the antenna tuner. The whole setup tunes a 44-ft dipole fine on 30m
thru 10M.

I'm not aware of what effect that short length of coax would have.

If the SWR on that coax is not 1:1, it will transform the impedance
seen at the balun by the percentage of a wavelength that "5 or 6
feet" represent - about 7 degrees on 80m and about 57 degrees on 10m.
--
73, Cecil http://www.qsl.net/w5dxp



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On Thu, 08 Jan 2004 10:36:32 -0600, Cecil Moore
wrote:

Bob Miller wrote:
The coax choke hangs just outside the window, so I don't have to bring
the ladderline into the shack. About 5 or 6 feet of rg-8x run inside
to the antenna tuner. The whole setup tunes a 44-ft dipole fine on 30m
thru 10M.

I'm not aware of what effect that short length of coax would have.

If the SWR on that coax is not 1:1, it will transform the impedance
seen at the balun by the percentage of a wavelength that "5 or 6
feet" represent - about 7 degrees on 80m and about 57 degrees on 10m.

Thanks, Cecil. That's a good excuse to just go ahead and shorten my
balun connections.

Bob
k5qwg

Bob Miller wrote:
Thanks, Cecil. That's a good excuse to just go ahead and shorten my
balun connections.

But Bob, how do you know those impedance transformations are
not beneficial to your matching process? :-)
--
73, Cecil http://www.qsl.net/w5dxp



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