[Antennas] Question reg. multiband dipole - balun

Tue, 19 Feb 2002 14:18:34 -0500

Comments inserted:

Christian Buenger wrote:
> 
> Hello dipole-user,
> 
> I have a question regarding a "normal" multiband (80m-10m) dipole. I am
> planning to set up the following antenna: A horizontal flat-top dipole abt.
> 2 x 15m long, fed with 450 Ohm window line. So far there are no problems
> but I can't route the window line through the window because the window has
> metal framing. Window line and metal structures is not working ;(

Can you remove one pane of glass and replace it with Lexan or some other
plastic?  This is what I have done .. have 7 coax feedlines and three
open-wire feedlines, all with feed-thru connections.

> 
> I thought abt. using an external weatherproof 1:4 balun, connecting the
> balun to the window line (outside the house where no metal structures
> exist) and then route coax into the shack (abt. 2-3 meters). Somebody told
> me that this is not going to work.

This is a fallacy .. depends on the bands you will operate, and the
length of the feedline as related to wavelength on those bands.  IF the
feedline length is a multiple of a quarter-wavelength on all bands, it
should work quite well.

> Unfortunately I can't put the whole
> tuner outside. That would make band changes very uncomfortable and
> additionally the tuner is not weather proof.
> 
> Has anybody a solution for this problem? Or experience?
> 
> Thanks in advance.

You're welcome!
Don
N8DE

> 
> 73
> Christian, DL6KAC
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