NTSC yakasarudza mitsara ye525 sekugadzirisa pakati peRCA's 441-scan line standard (yatove ichishandiswa neRCA's NBC TV network) uye Philco's uye DuMont's chido chekuwedzera nhamba yemitsara yekuongorora kuti isarudze pakati pe605 ne800 yakakurudzirwa. Chiyero che 30 mafuremu (mifananidzo) pasekondi, inosanganisira mitsara miviri yakaiswa pakati peminda yevatema nemachena yakavakirwa pakurudziro ya1936 yakaitwa neRadio Manufacturers Association (RMA). NTSC yakasarudza mitsara ye525 sekugadzirisa pakati peRCA's 441-scan line standard (yatove ichishandiswa neRCA's NBC TV network) uye Philco's uye DuMont's chishuwo chekuwedzera nhamba yemitsara yekuongorora kuti isarudze pakati pe605 ne800 yakakurudzirwa.
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