The individual radio frequency filters are balanced successively by application of an auxiliary frequency at the antenna input. The auxiliary frequency is disposed between the frequency of the picture carrier and the sound carrier of the selected channel. The resulting intermediate frequency is disposed in the intermediate frequency region between the picture and sound intermediate frequency. The measurement voltage is picked up at the automatic gain control output of the radio frequency amplifi...

Apparatus for cutting pre-comminuted material into chips. The apparatus includes an outer normally stationary cage which carries a plurality of normally stationary blade assemblies which circumferentially surround a rotor which carries rotary blades to coact with normally stationary blades of the cage. The several normally stationary blade assemblies which are carried by the cage can all be simultaneously locked or unlocked. When unlocked they can be individually removed in order to be selective...

A wood chip cutting machine comprises a casing with a drum shaped cutter cage therein, the cage having a plurality of inwardly pointing cutters spaced around it. Cooperating with the cage is a rotor having arms each of which carries a thin double-edged blade. Each blade is replaceable, and is clamped on its rotor arm by a retaining strip held in place by bolts. The blade protrusion is only about equal to the blade thickness, which is preferably 2 mm.

A circuit arrangement for controlling tuning operations in a high frequency eceiver employs a high impedance such as a field-effect transistor coupled between a capacitor and tuning varactors. The capacitor is connected via a relay contact, to either chassis ground or to a charging voltage source depending on the desired search direction. The relay is controlled by a first bistable multivibrator as a function of the state of a second bistable multivibrator. When a station signal is detected ther...

An antenna and television receiver are interconnected by an adjustable atuator in the form of a .pi. network having a longitudinal branch with a p-i-n diode, an antenna cross branch with high frequency short-circuiting and adjustable control means, and a receiver cross branch with high frequency short-circuiting means and a second p-i-n diode coupled to a positive bias source whereby variable attenuation is accompanied by substantially constant input and output impedances.

The invention provides an adjustable holder for strip steel blade, the holder being fixable in a wood chipping machine cutter head. The blade fits over pins in one of a pair of clamping jaws (or in a shim carried by one of said jaws) and this jaw is adjustable towards or away from the cutting edge of the blade so as to adjust this edge to project beyond the holder to a required amount. The jaws are then clamped on to the blade by screws. The blade may be double-edged and reversible.

A fuel pressure regulator comprising a housing, a movable diaphragm mounted within the housing, the diaphragm including a first side communicating with the atmosphere and an opposite second side having first and second portions, a fuel chamber partially defined by the first portion of the second side of the diaphragm, a constant pressure chamber partially defined by the second portion of the second side of the diaphragm, a fuel inlet communicating with the fuel chamber, and a fuel outlet having ...

A method and apparatus is provided for the tuning of the resonant circuits of a communications receiver. The frequency f.sub.D is generated with an additional oscillator, which frequency is then mixed with the receiver oscillator frequency, of which three frequencies fo, fo+f.sub.D, fo-f.sub.D are formed and are applied to the antenna output. The frequency f.sub.D, which is evaluated as a narrow band, is generated by mixing at the intermediate frequency output. A maximum balancing is provided ov...

An automatic alignment system for the tuner of a television receiver with a controlled high-frequency preamplifier stage and an intermediate-frequency amplifier that has a reference circuit with a resonance frequency that can be switched to the arithmetic mean between the video-carrier intermediate frequency and the audio-carrier intermediate frequency during automatic alignment. The maximum control voltage is employed as a criterion for optimum alignment and an auxiliary oscillator is switched ...

Disclosed herein is a two stroke internal combustion engine comprising a cylinder, a crankcase extending from the cylinder, a piston reciprocal in the cylinder and defining, with the cylinder, a variable volume combustion chamber and defining, with the crankcase, a crankcase chamber having a volume which varies inversely with respect to the volume of the combustion chamber, a transfer passage communicating, subject to piston movement, between the crankcase chamber and the combustion chamber, an ...