Repeaterbook enters and displays data from the perspective of the remote (user) radio.

To reduce confusion as to which frequency is being referenced in terms of a paired frequency set (duplex with separate input and output frequencies), as repeaters typically use, the downlink frequency refers to the repeater's transmit frequency. This is the frequency programmed into the user radio (HT, mobile, base) that you listen to the repeater on, so the radio's receive frequency.