▁frequency ), ▁dem od ul ates ▁the ▁signal , ▁and ▁simultaneously ▁re - trans m its ▁the ▁information ▁on ▁its ▁" output " ▁frequency . ▁ ▁All ▁stations ▁using ▁the ▁repe ater ▁transmit ▁on ▁the ▁repe ater ' s ▁input ▁frequency ▁and ▁receive ▁on ▁its ▁output ▁frequency . ▁ ▁Since ▁the ▁repe ater ▁is ▁usually ▁located ▁at ▁an ▁elev ation ▁higher ▁than ▁the ▁other ▁rad ios ▁using ▁it , ▁their ▁range ▁is ▁greatly ▁extended . ▁ ▁Because ▁the ▁transmit ter ▁and ▁receiver ▁are ▁on ▁at ▁the ▁same ▁time , ▁isol ation ▁must ▁exist ▁to ▁keep ▁the ▁repe ater ' s ▁own ▁transmit ter ▁from ▁de grad ing ▁the ▁repe ater ▁receiver . ▁If ▁the ▁repe ater ▁transmit ter ▁and ▁receiver ▁are ▁not ▁isolated ▁well , ▁the ▁repe ater ' s ▁own ▁transmit ter ▁des ens it izes ▁the ▁repe ater ▁receiver . ▁The ▁problem ▁is ▁similar ▁to ▁being ▁at ▁a ▁rock ▁concert ▁and ▁not ▁being ▁able ▁to ▁hear ▁the ▁weak ▁signal ▁of ▁a ▁conversation ▁over ▁the ▁much ▁stronger ▁signal ▁of ▁the ▁band . ▁ ▁In ▁general , ▁isol ating ▁the ▁receiver ▁from ▁the ▁transmit ter ▁is ▁made ▁easier ▁by ▁maxim izing , ▁as ▁much ▁as ▁possible , ▁the ▁separation ▁between ▁input ▁and ▁output ▁frequencies . ▁ ▁When ▁operating ▁through ▁a ▁repe ater , ▁mobile ▁stations ▁must ▁transmit ▁on ▁a ▁different ▁frequency ▁than ▁the ▁repe ater ▁output . ▁Although ▁the ▁repe ater ▁site ▁must ▁be ▁capable ▁of ▁simultane ous ▁reception ▁and ▁transmission ▁( on ▁two ▁different ▁frequencies ), ▁mobile ▁stations ▁can ▁operate ▁in ▁one