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This paper reports new observations of pulsars B0943+10 and B1822--09 carriedout with the Arecibo Observatory (AO) and the Giant Metrewave Radio Telescope(GMRT), respectively. Both stars exhibit two stable emission modes. We reportthe discovery in B0943+10 of a highly linearly polarized precursor componentthat occurs primarily in only one mode. This emission feature closely resemblesB1822-09's precursor which also occurs brightly in only one mode. B0943+10'sother mode is well known for its highly regular drifting subpulses that areapparently produced by a rotating carousel system of 20 beamlets. Similary,B1822-09 exhibits subpulse-modulation behavior only in the mode where itsprecursor is absent. We survey our 18 hours of B0943+10 observations and findthat the sideband-modulation features, from which the carousel-rotation timecan be directly determined, occur rarely--less than 5% of the time--but alwaysindicating 20 beamlets. We present an analysis of B1822-09's modal modulationcharacteristics at 325-MHz and compare them in detail with B0943+10. The pulsarnever seems to null, and we find a 43-rotation-period feature in the star's Qmode that modulates the interpulse as well as the conal features in the mainpulse. We conclude that B1822-09 must have a nearly orthogonal geometry andthat its carousel circulation time is long compared to the modal sub-sequencesavailable in our observations, and the mainpulse/interpulse separation isalmost exactly 180 degrees. We conclude the precursors for both stars areincompatible with core-cone emission. We assess the interesting suggestion byDyks et al. that downward-going radiation produces B1822-09's precursoremission.

The beam topology and dynamic emission properties of pulsar B0943+10 -- VI. Discovery of a 'Q'-mode precursor and comparison with pulsar B1822-09