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Amateur transmit simultaneously on 2 freq
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united states - Can I transmit on 2 frequencies simultaneously? - Amateur Radio Stack Exchange
By Kevin K. For the sake of the complete beginner I'm going to cover all the parts, even those which may seem obvious. What is a Repeater? A repeater, in concept, is not really a complicated device.
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A radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. Repeater systems use two different radio frequencies; the mobiles transmit on one frequency, and the repeater station receives those transmission and transmits on a second frequency. Since the repeater must transmit at the same time as the signal is being received, and may even use the same antenna for both transmitting and receiving, frequency-selective filters are required to prevent the receiver from being overloaded by the transmitted signal.
Simplex, Duplex, Offset and Split. The word simplex is not needed. Most of them are but not all. More importantly, I think this exchange highlights some common confusion about terms such as simplex, duplex and repeater operation.