Cannot enter the strongest suggested 72.0 W AMC 6 transponder frequency in Coolsat 6000 SG2100 motorized setup screen. Only has 18 pre-set frequencies fo choose from. Should the TP frequency closest to the strongest suggested TP frequency be selected? 12143 is suggested, but the closest Coolsat 6000 pre-set available is 12181. Is this close enough? Trying to lock the 72.0 W AMC 6 satellite in first. It is true south satellite.