Can also be used for paging protocols like Golay and POCSAG  ( http://en.wikipedia.org/wiki/POCSAG ) . The 4 level slicer is useful for other protocols like Flex  ( http://en.wikipedia.org/wiki/FLEX_%28protocol%29 ) paging. Schematics for various slicers: On 11 Apr 1997 16:30:43 GMT, in the newsgroup rec.radio.scanner, bich@scd.hp.com (Bich Tran) from Hewlett Packard thoughtfully