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==Selecting a Frequency Pair==Pick your frequency pair carefully, so as not to cause harmful interference to other users. The use of cross-band repeaters has the potential to cause serious disruption of communications circuits, and the creation of harmful interference to coordinated repeaters. If you are not sure of active repeater frequencies in your area, a safe rule is to stay off of the repeater sub-bands and use the FM simplex portion of each band. You should consider using CTCSS on the frequency your transceiver lists on for your mobile input. This will help prevent your repeater from broadcasting unwanted transmissions coming into the input from interference or distant transmissions during periods of unusual band propagation. According to an article on KB9VBR called Cross-Band Repeater Operation, "Kenwood’s TM-V71A and TM-D710 now have the ability to identify the outgoing UHF transmission." This article also goes on to explain very well the legal issue with cross-band repeater operation. Here is a quote, <small>"When you transmit, you identify your transmission with your callsign. The incoming UHF transmission is identified, and the outgoing vhf transmission is identified, since you are the control operator of your handheld radio and of the cross-band transceiver. On the other side of the transmission, the repeater identifies its own transmissions. That transmission is then retransmitted by the cross-band transceiver on the UHF channel. But this UHF transmission does not have your callsign attached to it, so it’s an unidentified transmission. Most cross-band repeat capable radios are designed with this fault."</small>According to an article on [http://www.jpole-antenna.com/ KB9VBR] called [http://www.jpole-antenna.com/2014/05/01/cross-band-repeater-operation/ Cross-Band Repeater Operation], "''Kenwood’s TM-V71A and TM-D710 now have the ability to identify the outgoing UHF transmission.''" This article also goes on to explain very well the legal issue with cross-band repeater operation. Here is a quote, <small>"''When you transmit, you identify your transmission with your callsign. The incoming UHF transmission is identified, and the outgoing vhf transmission is identified, since you are the control operator of your handheld radio and of the cross-band transceiver. On the other side of the transmission, the repeater identifies its own transmissions. That transmission is then retransmitted by the cross-band transceiver on the UHF channel. But this UHF transmission does not have your callsign attached to it, so it’s an unidentified transmission. Most cross-band repeat capable radios are designed with this fault.''"</small>==duty cycle====Duty cycle==* [cbr-fig1.gif Cross-Band Repeater Operation]* [http://www.jpole-antenna.com/2014/05/01/cross-band-repeater-operation/ Cross-Band Repeater Operation, KB9VBR J-Pole Antennas]