Abstract: A portable radar simulator which when connected to a transmitting means s as a magnetron generated microwave threat transmitter simulates up to 2048 pre-programmed radar signatures. The portable radar simulator comprises a replaceable Erasable Programmable Read Only Memory (EPROM) which will hold up to 2048 pre-programmed radar signatures. Selection of a particular radar threat to be simulated is entered by an operator via thumbwheel switches located on the front panel of the simulator. The portable radar simulator simulates such radar parameters as jitter, stagger, frequency hop, simple and complex scans, pulse repetition intervals and frequency pulse widths.

Abstract: In an electronic sign having a set of segmented character displays, programming cards are used to control which segments are illuminated. In one embodiment, each card has a printed circuit providing electrical connection from an unfiltered, rectified ac power source via a silicon controlled rectifier to those display segments for which there are corresponding contacts in the printed circuit. Plural such cards may be wired to each character display via respective SCR's with segmented trigger signals causing sequential card energization and hence message display.In another embodiment, segment illumination data is stored in a memory and accessed sequentially and repetitively to control which characters are displayed. Similar programming cards may be used to enter into the memory data defining each message character. A set of counters control memory addressing and selective segment energization via appropriate decoder/driver circuits that receive the data from the memory and drive the display segments.