8 ▁M Hz ▁band ▁use ▁a ▁ 2 5   M Hz ▁separation . ▁ ▁Systems ▁in ▁the ▁ 4 5 0 – 4 7 0   M Hz ▁band ▁use ▁a ▁ 5   M Hz ▁separation ▁with ▁the ▁input ▁on ▁the ▁higher ▁frequency . ▁Example : ▁input ▁is ▁ 4 5 6 . 9 0 0   M Hz ; ▁output ▁is ▁ 4 5 1 . 9 0 0   M Hz . ▁ ▁Systems ▁in ▁the ▁ 8 0 6 – 8 6 9   M Hz ▁band ▁use ▁a ▁ 4 5   M Hz ▁separation ▁with ▁the ▁input ▁on ▁the ▁lower ▁frequency . ▁Example : ▁input ▁is ▁ 8 1 0 . 1 8 7 5   M Hz ; ▁output ▁is ▁ 8 5 5 . 1 8 7 5   M Hz . ▁ ▁Military ▁systems ▁are ▁suggested ▁to ▁use ▁no ▁less ▁than ▁a ▁ 1 0   M Hz ▁spacing . ▁ ▁These ▁are ▁just ▁a ▁few ▁examples . ▁There ▁are ▁many ▁other ▁separ ations ▁or ▁spac ings ▁between ▁input ▁and ▁output ▁frequencies ▁in ▁oper ational ▁systems . ▁ ▁Same ▁band ▁frequencies ▁ ▁Same ▁band ▁repe aters ▁operate ▁with ▁input ▁and ▁output ▁frequencies ▁in ▁the ▁same ▁frequency ▁band . ▁For ▁example , ▁in ▁US ▁two - way ▁radio , ▁ 3 0 – 5 0   M Hz ▁is ▁one ▁band ▁and ▁ 1 5 0 – 1 7 4   M Hz ▁is ▁another . ▁A ▁repe ater ▁with ▁an ▁input ▁of ▁