Abstract: A dual ammunition feed for automatic weapons includes a positioning device for the ammunition wherein a central positioning sprocket unit interacts with two feed sprocket units in two separate feed casings to allow for loading with two different types of ammunition. The feed casings are tiltable into and out of engagement with the positioning device, the tilting of a particular feed casing into engagement with the positioning device being followed by the simultaneous disengagement of the other feed casing from the positioning device. The tilting of a particular feed casing into engagement further results in the coupling of the engaged feed casing's feed sprocket unit with a reducing transmission driven by an external motor, and in a change in the rotational direction of the central positioning sprocket unit such that the central positioning sprocket unit always rotates in an opposite direction from that of the feed sprocket unit of the particular feed casing which is engaged.

Abstract: A transmission system is provided with a transmitter (10) transmitting data in series, either individually or in groups, by phase shifts applied to a transmitter carrier between characteristic instants which are separated by equal time intervals. The system further comprises a receiver (20) which is sensitive to phase shifts in the transmitter carrier between the characteristic instants. The transmitter comprises a coder (2) which causes the data to be transmitted to correspond to discrete values of a shift, and a symbol synthesizer (3) under the control of the coder to generate the waveform of the phase variation between two successive characteristic instants. This waveform is continuous and has minimum gradient and can be expressed as a function of time by a polynomial law. The receiver uses a synchronous demodulation and a correlation method to recover the characteristic instants and also the frequency drift between the transmitter carrier and the receiver carrier.