Isidibanisi sodidi lwe-F sihlala sihleli, sinesini kunye nesidibanisi se-RF esinemisonto ephezulu.Iqhele ukusetyenziswa kumabonakude wentambo, umabonakude wesathelayithi, iibhokisi eziphezulu kunye neemodem zentambo.Esi siqhagamshelo saphuhliswa ngeminyaka yoo-1950 ngu-Eric E Winston we-Jerrold Electronics, inkampani eyayiphuhlisa izixhobo ze-US cable TV market.