FX403

• N-DIGIT HSC ADDRESS DECODING
• GROUP AND ALL-CALL DECODING
• EXPANDABLE CODE-ROM ADDRESSING
• LOW POWER CMOS PROCESS

• DECODES SUFFIX INSTRUCTION CODES
• CODED BLEEP AND AUDIO MUTE OUTPUTS
• ENCODES N-DIGIT ADDRESS/DATA CODES
• TRANSMIT/TRANSPOND ENCODE FUNCTIONS

The FX403 is an address/decoder/encoder operating in agreement with the HSC rules. It is intended for use in mobile, portable and fixed station tone operated selective signalling applications. In decode mode, it accepts 4 bit QTC data characters from an FX-003 tone decoder and compares these with an address held in an external memory (ROM). Receipt of a correct code causes the MUTE output to switch and an alert pattern to be output at the AUDIO output. The alert tone is a 2.121kHz square wave, interrupted in a set pattern governed by the type of information decoded (e.g. address, address and data, group call). These audible warnings are output continuously until reset. Further decoding of an address can be stopped if failure to meet any timing or HSC format requirement is detected. It decodes valid group codes and a series of address suffix codes as defined in HSC. These include instructions to inhibit alerts mute audio and inhibit/initiate transpond. Where a valid address or group code is followed by a data sequence, a DATA FLAG is set, and a LOAD PULSE for each character of data is output. The FX403Q can be instructed to automatically transpond an address or sequence stored in the external memory. When used with an FX503 it will perform encoding functions to generate address and data codes. Address codes can be held in an external memory and loaded under instruction into the FX503 for generation.

White ceramic case and golden pins.