Abstract: Attenuation in a received signal caused during transmission of the signal to a receiver is automatically compensated. An amplitude of first reference data within the received signal is compared with an amplitude of second reference data. A gain of the received signal is varied based on the results of the comparison. The amplitude comparison and gain varying are repeated until the amplitude of the first reference data and the amplitude of the second reference data differ by a predetermined amount.

Abstract: A machine for use in the manufacture of saw blades includes apparatus for performing a plurality of machining operations on the tips of individual teeth of the saw blades. Each tip to be machined is positioned in turn at a point coincident with a horizontal axis X normal to the body of the saw blade. The machine includes a main frame having a pivot coincident with the axis X. The front face and top face are machined by apparatus supported on a first yoke mounted on the pivot and situated to the right of a vertical plane containing the axis X. All other apparatus for machining other aspects of the blade tip including the side faces, steel relief, face profiling, grooving, bevelling, quill grinding, etc., are supported on a second yoke mounted on the pivot and situated to the left of the vertical plane containing the axis X.

Abstract: A radio frequency heating apparatus incorporating a radio frequency generater valve (5), a radio frequency impedance matching transformer (7) and a heating coil/element arrangement (14) which is arranged to be selectively displaceable with respect to a working zone, wherein the heating coil or heating element (14) is integrally associated with the radio frequency impedance matching transformer (7) and is so physically separated from the radio frequency generator valve (5) that on displacement of the heating coil/element arrangement the transformer is constrained to move therewith without mechanically displacing the generator valve (5).

Abstract: A method of and apparatus for mounting hard material tips to a cutter tool such as a saw blade body (6), wherein a gripper/pick-up member/element (4) for handling the tips (8) to be mounted or other material required in the tip mounting operation is moveable about an axis (1) in order to transfer the tips or other material from a supply(ies) thereof to a location (9) at which the tips can be mounted or said other material can be utilized in the mounting of the tips.

Abstract: A cutter tool of the kind having a blade body with teeth which are provided with hard material tips is so machined that the side faces of the tips are dished or otherwise concavely contoured.The machining involves mounting the blade body on a worktable and first machining the side faces on one side of the tips to produce a reference plane including the ends of the cutting edges of the tip and using this plane as a reference plane for subsequent machining of the other side faces and the surfaces of the blade body.