[Antennas] DXSR-FVD4

[pa3gwh at planet.nl]

As far as I can see, they (and many others like PKW, DG1OGW, ITA) use the 
principle of an MLB, but instead of attaching a wire they attach a 
vertical. I don't know how the MLB is constructed, but perhaps someone 
else can comment on this?

Richard



On Thu, 18 May 2006, EA5XQ(Juan A. Bertolin) wrote:

> Hi
> 
> I found a reference to DXSR-FVD4 antenna http://f6kal.free.fr/DXSR.htm and
> sounded me interesting so I built my home-brew version with wire of 0.5mm
> diameter (not aluminium pipe) using a fishing pole of 11m. First at all, I
> tried to model the antenna (according to the comercial comments it provides
> low swr in almost all the bands) but I only was able to get such low swr in 20
> and 40m (also in real situation tested with my MFJ259). I used MMANA to model
> it.
> 
> How they can get low swr (I mean no tuner is needed) for all of bands with
> only one balun if every band shows different values of impedances??? Is there
> any special technique to build the balun? I'm using a 4:1 currently, for 20m I
> was able to be very close to 200ohms of Z.
> 
> Any comment or suggestion will be appreciated
> 
> Thanks
> 
> 73 Juan, EA5XQ
> 
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