Rohr! Now there is a name I have not heard in some time.
Now they make some shuttle parts...
--- In email@example.com, "s92187" <tmichaels@t...> wrote:
> --- In firstname.lastname@example.org, David Lesher <wb8foz@n...>
> > Do we know anything about the round cornucopia horns, such
> > as seen at Alexander?
> > I recall seeing such at non-ATT sites, so I assume they
> > are non-WECO, but other than that...
> The circular horn antennas in the photo were made by Gabriel
> Electronics. Gabriel and Andrew Corporation made that type of
> antenna, and unlike the all metal construction they used, AFC
> (Antennas For Communications) made a similar antenna out of
> fiberglass with an embedded conductive layer, that design was
> to catastrophic damage when hit by lightning.
> The Andrew antennas in particular were very popular with the other
> long distance carriers such as MCI.
> The KS type pyramidal horn reflector was invented and patented by
> Bell Labs in the '40s. I don't know which company invented the
> circular horn reflector antennna years later. The performance of
> circular antenna is better than the KS type antenna for several
> reasons. The main improvement was the use of microwave absorber
> material applied to the inside of the upper part of the conical
> and the cylindrical section that supports the weather cover. Also,
> being circular in shape, there are no right angle corners in the
> aperture. Together these changes resulted in much lower side
> and a higher front to back ratio, as the microwave bands became
> crowded with additional routes by AT&T and the other common
> the cleaner radiation pattern from the circular type antenna
> more important.
> As for AT&T, I have an AT&T memo from December 1976 that mentions
> that Rohr Corp, on of the two outside suppliers of the pyramidal
> antenna for AT&T, was discontinuing production on that antenna.
> sure that also had something to do with AT&T using the conical
> for new installations beginning in the late '70s or so.
> Terry Michaels