CMX882, a full-function half-duplex audio and signalling baseband processor IC for FRS and PMR446 type facilities -for both complex and simple end-designs.
Under the control of the host µC, all voiceband requirements are catered for: Voiceband and sub-audio filtering, pre/de-emphasis, compression and expansion, and audio routing and global level-setting with single or two-point modulation in the transmit path.
The combination of new and standard signalling functions in this product offer, under software control, increased functionality, versatility and privacy.
Standard Extended-Code CTCSS and DCS functions are integrated with the new XTCSS code implementation.
XTCSS provides more and better squelch-centred privacy codes with the added advantage of ‘silent operation’; no annoying interference from other sub-audio users. XTCSS fitted radios enjoy more privacy and flexibility of operation.
For advanced and enhanced radio operation the CMX882 embodies a 1200/2400 bps freeformat and formatable packet data FFSK/MSK modem (compatible with NMEA 0183) for Global Positioning by Satellite (GPS) operations.
The CTCSS configuration of this product enables:
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The CMX882 is a sophisticated modem + baseband processor targeted at “family radio” applications (e.g. FRS/GMRS/MURS/PMR446 radios). It is particularly well suited to family radios that include facilities for text messaging and GPS location data exchange. The purpose of this application note is to illustrate how the CMX882 can be configured for a feature-rich “family radio” product.
The Hexadecimal Sequential Code (HSC) is a coding format for sequential tone signalling systems. HSC permits address codes, instruction codes and data blocks to be exchanged on an unrestricted basis between all units in a network, thus providing the key to the design of fully integrated base/mobile/personal communications schemes. HSC is also compatible with the frequencies and protocols used for international '5-tone' selective call (SelCall).