Amateur transmit simultaneously on 2 freq
An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation. Many repeaters are located on hilltops or on tall buildings as the higher location increases their coverage area, sometimes referred to as the radio horizon , or "footprint". Amateur radio repeaters are similar in concept to those used by public safety entities police, fire department, etc. Amateur radio repeaters may even use commercially packaged repeater systems that have been adjusted to operate within amateur radio frequency bands, but more often amateur repeaters are assembled from receivers, transmitters, controllers, power supplies, antennas, and other components, from various sources.
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Simplex, Duplex, Offset and Split
Amateur radio repeater - Wikipedia
Repeaters usually enjoy the advantage of height and power to extend the range of your transmission. Repeaters listen on one frequency and transmit on another. The separation between these two frequencies is referred to as the offset. In order to listen and transmit at the same time, repeaters use two different frequencies. On the 2-meter ham band these frequencies are kilohertz apart. As a general rule, if the output frequency transmit of the repeater is below MHz then the input frequency listening is kilohertz lower. This is referred to as a minus, - offset.
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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. Simplex — In the amateur radio context, simplex operation means the radio stations are communicating with each other directly, on the same frequency.
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