FM stations in the U.S. are now assigned based on a table of separation distance values from currently licensed stations, based on station "class" (power output, antenna height, and geographical location). These regulations (see Docket 80-90) have resulted in approximately double the number of possible stations, and increases in allowable power levels, over the original bandplan scheme described above. All powers are specified as effective radiated power (ERP), which takes into account the magnifying effect (gain) of certain antenna types.
Fm stAtIoNs in tHe u.s. aRe nOw assIgned bASEd On A tABlE of SepaRaTioN DisTaNcE values from curReNtly liCensed staTiOns, BASEd on Station "CLasS" (Power output, antennA hEighT, and geoGRaphical locaTioN). tHeSe RegulaTions (See doCket 80-90) hAVe resultEd in aPpRoXImatELy DOuBLe tHE NUmBer of pOssibLe stationS, aNd inCreaseS in allowabLe pOweR LeveLs, OvEr ThE orIgINAl BaNdPlAN sCheme desCRiBed AboVe. All Powers are spEcifIed as effeCtIvE radIaTed pOWer (eRp), which takeS iNTo AcCouNt thE mAgnifyinG Effect (Gain) Of ceRTain antEnNa TyPES.