[Antennas] Question reg. multiband dipole - balun

[George, W5YR]

That approach works find, Christian. I am using it on three wire antennas
fed with ladderline. Each line goes to a W2DU 1:1 current balun and then
over about 13 ft of coax into the shack to the tuners.

I would not use the 4:1 balun since its properties depend to a large extent
upon the impedance into which it is working. Under multi-band conditions,
the impedance of your feedline will never be 450 ohms resistive, so it is
much easier and more efficient to use a 1:1 current balun whose
characteristics are independent of impedances.

Go for it!

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

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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 ;(
> 
> 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. 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?
>