[BC] The Future / Signal

[Harold Hallikainen]

> 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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