Abstract: A tunable, temperature compensated, thermal and mechanical stable, dielectric loaded cavity resonator and filter assembly has high unloaded Q, wide frequency tuning range and simple structure suitable for high volume production. The cavity resonator consists of a conductive housing, a substantially cylindrical ring shape dielectric body with a low loss, low thermal expansion coefficient support, a tuning mechanism and a plastic support at the opposite side of the main cylindrical dielectric body, which holds the main cylindrical dielectric body in place. The tuning mechanism further includes a substantially cylindrical dielectric tuning element positioned in or near the hole of the main cylindrical dielectric body and a self-locked or equivalent nut locked rotor with a support using the same material as that of the main cylindrical body support.

Abstract: The rear-mounted scraper of this invention is adapted for attachment to the rear of a vehicle which has a rear bumper, bottom and a rear axle. The rear-mounted scraper has a hitch with portions adapted for attachment to the bottom of the vehicle and portions defining pivotal attachment points which define a horizontal pivot axis. The pivot axis of the attached hitch is spaced from the rear axle and the rear of the vehicle and is beneath the bottom of the vehicle. The plow also has a scraper assembly which has a blade an extension which extends forward from the blade and is pivotally mounted at the hitch pivot points to enable the scraper assembly to pivot about the horizontal pivot axis.