[BC] The Future / Signal

[Glen Kippel]

As Harold so astutely noted, the horizontal beamwidth of a Scala Paraflector
is indeed quite broad if it is mounted on its side, i.e. horizontal
polarisation.  I don't even know if such an attitude would be permissible in
this area, with 2 and sometimes 3 stations on every STL channel.  Some 14
years ago, I was told that 6-foot or larger dishes would be required.
Existing stations using Paraflectors and even Miniflectors are grandfathered
in, but it would be hard to get those approved now.

On 12/4/06, Harold Hallikainen <harold at hallikainen.com> wrote:
>
>
> > All I know is that I once ad a 950 link that ran over the LA basin. With
> > Hpol,
> > on a hot summer day you could watch the signal vary from over 2 mv/m to
> > ZERO
> > (IE: station off the air!). It would stay at 2 mv all night.
> >
> > Went to vertical and the problem DISAPPEARED!!
> >
> > -D
>
>
> Instead of polarization is this, perhaps, difference in beamwidth between
> "horizontal" and "vertical" on the antenna? If this was a Paraflector
> PR450-U mounted for vertical polarization, I think they had a fairly
> narrow "horizontal" beamwidth, but a wide "vertical" beamwidth. Rotating
> the antenna 90 degrees swapped these beamwidths. If the air at a
> particular elevation is one temperature and the air above it is another, I
> think a signal heading from a lower elevation to a higher would be bent
> "up or down" instead of "east or west" as it passed through the boundary.
> If you have a narrow vertical beamwidth, it may bend up or down enough to
> miss the receive antenna.
>
> So, is it possible that the issue was not polarization, but, instead,
> beamwidth?
>
> Harold
>
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