0   M Hz ▁bands ▁and ▁is ▁fully ▁program m able . ▁ ▁Building ▁repe aters ▁The ▁AR RL ▁( American ▁Radio ▁Rel ay ▁League ) ▁has ▁specified ▁that ▁repe aters ▁on ▁the ▁ 3 3 ▁cent imeter ▁band ▁use ▁a ▁split ▁of ▁- 1 2   M Hz ▁with ▁inputs ▁between ▁ 9 0 6 ▁and ▁ 9 0 9   M Hz ▁and ▁outputs ▁between ▁ 9 1 8 ▁and ▁ 9 2 1   M Hz . ▁However , ▁the ▁majority ▁of ▁amateur ▁ 3 3 ▁cent imeter ▁band ▁amateur ▁repe aters ▁use ▁a ▁split ▁of ▁- 2 5   M Hz ▁with ▁inputs ▁between ▁ 9 0 2 ▁and ▁ 9 0 3   M Hz ▁and ▁outputs ▁between ▁ 9 2 7 ▁and ▁ 9 2 8   M Hz . ▁There ▁are ▁several ▁reasons ▁behind ▁this . ▁The ▁primary ▁reason ▁being ▁that ▁most ▁amateur ▁repe aters ▁in ▁this ▁band ▁are ▁built ▁from ▁commercial ▁equipment ▁that ▁has ▁been ▁modified ▁to ▁transmit ▁and ▁receive ▁in ▁the ▁amateur ▁ 3 3 ▁cent imeter ▁band ▁and ▁modification ▁complexity ▁increases ▁rapidly ▁as ▁target ▁frequencies ▁are ▁moved ▁further ▁from ▁the ▁original ▁design ▁frequencies . ▁A ▁ 2 5   M Hz ▁split ▁results ▁in ▁frequencies ▁fairly ▁close ▁to ▁the ▁original ▁frequencies ▁this ▁commercial ▁equipment ▁was ▁designed ▁for ▁resulting ▁in ▁relatively ▁simple ▁modifications . ▁As ▁well , ▁spectrum ▁analy zer ▁tests ▁consist ently ▁show ▁the ▁noise ▁floor ▁to ▁be ▁consider ably ▁higher ▁near ▁the ▁center ▁of ▁the ▁band ▁due ▁to ▁other ▁non - am