  The white paper discusses Arecibo Observatory's plan for facility
improvements and activities over the next decade. The facility improvements
include: (a) improving the telescope surface, pointing and focusing to achieve
superb performance up to ~12.5 GHz; (b) equip the telescope with ultrawide-band
feeds; (c) upgrade the instrumentation with a 4 GHz bandwidth high dynamic
range digital link and a universal backend and (d) augment the VLBI facility by
integrating the 12m telescope for phase referencing. These upgrades to the
Arecibo telescope are critical to keep the national facility in the forefront
of research in radio astronomy while maintaining its dominance in radar studies
of near-Earth asteroids, planets and satellites. In the next decade, the
Arecibo telescope will play a synergistic role with the upcoming facilities
such as ngVLA, SKA and the now commissioned FAST telescope. Further, the
observatory will be actively engaged in mentoring and training programs for
students from a diverse background.
