Jose,
You only need about 2 to 2.5 degrees of downtilt. If your antenna
is produced by one of the major antenna builders they should be able
to provide you with feedline section lengths for the required downtilt.
The longer sections go to the lower bays.
Based on your signature, I assume this is a commercial FM antenna -
I would expect the spacing between bays to be between 1.5 and 2
wavelengths and expect each bay is circularly polarized if your
antenna is similar to practice in the US. Both the nature of the
bay and the spacing will effect the required phasing (delay).
Regards,
... Joe Subich, W4TV
> -----Original Message-----
> From: antennaware-bounces@contesting.com
> [mailto:antennaware-bounces@contesting.com] On Behalf Of Jose
> Agustin Fuentes Sequeira
> Sent: Saturday, March 18, 2006 2:56 PM
> To: antennaware@contesting.com
> Subject: [Antennaware] downtilt changing cable lenght
>
>
> I am trying to obtain downtilt in an antena installed
> in a 1000 meters hill in order to cover a city
> situated at 24 km distance 100 meters over sea level.
> It has 4 bays and one splitter. All the coaxial cables
> from the splitter to the bays are actually same lengh.
> But a technician has comented that changin the lengh
> of the cables it is possible to obtain downtil. The
> problem is that he do not know if the longer cable
> goes to the upper bay or t he lower one.
> I hope you can give me an answer.
> J.A.Fuentes, Radio La Musical, Managua, NIcaragua.
>
>
> Jose Agustin Fuentes Sequeira
>
>
>
>
>
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