Abstract: A splatter control circuit (28) for a noise blanking receiver (10) includes a SAW filter (40) having an output (115) in a main signal path. A noise blanker (27) having a control input (86) and a signal input (128) connectable to the input of the SAW filter, and an output (58), produces at its output signals received when no noise pulses are detected and the blanker switch blanking the SAW output when a noise pulse is detected. A level detector (80) having an input connected to the output of the SAW filter and an output, the level detector producing a signal at its output to stop the blanker from blanking at its control input when the SAW filter passes a signal above a predetermined level.

Abstract: A primary slotted array antenna operates at 10 GHz. In front of the primary antenna there is disposed a secondary antenna which operates at 1 GHz and is substantially transparent at 10 GHz. The secondary antenna is formed by an array of patch radiators and a transmission line feed network. The radiators and feed network are all formed by a conductive grid sandwiched between dielectric layers and designed to achieve the transparency at 10 GHz. At 1 GHz the grid appears as a continuous conductor forming one conductor of a microstrip transmission line. The other conductor (ground plane) is formed by the conductive front surface of the primary antenna. The grid/dielectric sandwich is suitably spaced from the ground plane by low dielectric pads. Other embodiments use slotline or coplanar stripline techniques. The ground plane may be an integral part of the secondary antenna, also constructed to be transparent at primary frequency.

Abstract: A shutter (111) and shutter control mechanism are disclosed, for use in a banknote dispensing machine for closing the outlet aperture. The shutter (111) fixed to a pivoted arm (112) is normally locked by a latch (109) which lodges in a V-shaped notch formed in the end of the shutter arm (112). When a stack of banknotes approaches the outlet aperture, a control circuit (not shown) energises an actuating solenoid (106) which pulls a drive tooth (103) through a linkage (105) against the action of a return spring (107). The drive tooth (103) rotates clockwise until it rests in the position shown in FIG. 3. During its rotation to this position, a drive pin (108) on the drive tooth (103) pushes the latch (109) away from the shutter arm, thus releasing the shutter. Meanwhile a snail cam, (104) rotates anti-clockwise, and eventually engages a cam follower surface on a lower corner of the drive tooth (103), the drive tooth being pivoted close to its center.

Abstract: This relates to sheet feeding apparatus of the kind in which sheets following separate first and second belt transport paths are fed into a common belt transport path. At the junction of portions of the paths of belts 5 and 9 which define portions of the first and second belt transport paths, a sheet guide 8 is freely mounted for pivotal movement about the shaft of a roller 20, the guide 8 having surfaces tapering to a leading end which extends towards the meeting point of the belts 5 and 9. One of these surfaces assists in guiding notes from the first path into the third common belt transport path, defined by the belts 5 and 9 upstream of their meeting point and the other of the guide surfaces guides notes arriving from the second belt transport path into the common path.