The table below is written from the perspective of the radio operator's transceiver. The radio would be set to the 'Rx Frequency' to hear the repeated conversations normally taking place and the transmit frequency ('Tx Frequency') is the 'Tx Offset' value added to the receive frequency ('Rx Frequency'). Example, to listen to the repeater network on your hand-held transceiver (HT) you listen to 147.340 MHz if you are near the James Ridge repeater and when you want to talk to someone using that same repeater your radio transmits on 147.940 MHz or the standard '+' offset of the receive frequency in other words [174.340 MHz +0.600 MHz = 147.940 MHz]. The 'PL Tone' is required in order for the repeater to listen to your transmission. Without a 'PL Tone' you can still listen to the repeater conversations but just can't have your transmission accepted and forwarded to the network by the repeater.