[TowerTalk] Matching network for wire antenna needed

[Jim Lux]

On 9/14/14, 3:36 PM, TexasRF--- via TowerTalk wrote:
> Conceptually this could be done using 50 ohm coax stub matching.
>
> Starting with the R +j of the four band segments, a design for each band
> series segment can be done. Then starting with the shortest series section,
> additional series cables can be added to achieve the proper length for the
> remaining three band segments. The junctions of the four series coax
> sections can be connected with Tee connectors. Then four shunt stubs  could be
> connected by means of suitable relay on the third leg of the Tee  connectors.
>
> I have not done this for the stated application but have used the concept
> to switch a 40m beam from cw to phone frequencies with excellent results. In
>   this case, only two stubs were switched in/out.
>
> When doing the design, there are multiple solutions with stub matching.
> Some solutions require a shorted stub, others require an open stub. One can
> visit the various solutions and choose one that minimizes the amount of coax
> needed.
>
> As usual, I am only the concept guy; you have to do the work. Transmission
> line software will make the job easier.
>

Or lumped LCs.. in general, with N lumped LCs you can get a perfect 
match at N frequencies.