PAL stands for Phase Alternation Lines (625 lines) and offers more picture detail and wider luminance (color signal) bandwidth. PAL has been adopted by almost all 50 Hz countries in the world.
NTSC stands for National Television Standard Committee which established the American TV broadcast TV standard as a 525 line broadcast. The NTSC system has higher frame rate (60 Hz) which reduces visible flicker and picture noise.
SECAM stands for SEquential Couleur Avec Memoire and is used in France and many eastern European countries. The Secam system also has 625 lines and offers good picture detail and stable hues.
Those channels (C-band) all seem to be on a S.America beam...