Doesn’t Optibeam use stubs on their 40-10m multibanders to minimize interaction
between 40 and other bands?
73, kelly, ve4xt
> On May 1, 2017, at 11:29 AM, Guy Olinger <k2av@contesting.com> wrote:
>
> On Mon, May 1, 2017 at 6:48 AM Mpridesti via TowerTalk <
> towertalk@contesting.com> wrote:
>
>> Any experience here placing a shortened 40 M dipole near and below the Hex
>> beam?
>
>
> Force12 famously kept their x40N series of 40m near full size yagis from
> interfering with their XR19, XR31, etc series of 20/15/10 tribanders by
> tinkering with the 40m folded element design until the secondary resonances
> lay in the WARC bands. That allowed mounting them within six feet on the
> same mast in the same direction without discernible effect on the
> tribander's pattern.
>
> Without experimentation on the 40m antenna, there is no way to know what
> bands may be bothered on the hex beam. Further, unless someone has the
> exact same setup as you there is no basis for extrapolating their results
> to your situation, particularly since feedline length and whether
> non-active coax are grounded or open at the coax switch will also affect
> results.
>
> Also note that "unaffected" SWR does not mean the pattern has not been
> trashed.
>
> Placing 80 and 40 dipoles/vees 30 feet away is the only way to minimize
> interaction with a five band hex beam for sure.
>
> I'm sure that wasn't what you wanted to hear.
>
> 73, Guy K2AV
>
>
>
>
>
>> --
> Sent via Gmail Mobile on my iPhone
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|