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Amateur radio repeater offset

In order to be able to achieve this, the repeater transmitter signal must not interfere with the receiver so that it is sufficiently sensitive to receive transmissions at the same time it is transmitting. To achieve this the receiver and transmit channels are offset sufficiently to enable this to occur. Most repeaters operate using the same location for transmit and receive, and normally they use the same antenna. In order that the transmitter signal does not enter the receiver and overload the input and desensitise it, the signal from the repeater passes into a duplexer.
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Amateur Radio Repeater Channel Offsets

Amateur radio repeater offset
Amateur radio repeater offset
Amateur radio repeater offset
Amateur radio repeater offset
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HAM Radio - Intro to Repeaters

In order to be able to achieve this, the repeater transmitter signal must not interfere with the receiver so that it is sufficiently sensitive to receive transmissions at the same time it is transmitting. To achieve this the receiver and transmit channels are offset sufficiently to enable this to occur. Most repeaters operate using the same location for transmit and receive, and normally they use the same antenna. In order that the transmitter signal does not enter the receiver and overload the input and desensitise it, the signal from the repeater passes into a duplexer. The purpose of this is to provide a filter for the receiver section of the repeater that only passes signals on the receive channel and rejects those on the transmit channel of the repeater. Often this consists of a band-pass filter for the receive channel and a notch filter for the transmit channel. Also for the transmitter, filtering must ensure that no spurious signals are radiated on the receive channel as this would also impair the sensitivity of the repeater receiver.
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About Repeaters

There are so many unanswered questions for the new HAM licensee. The simplest method to communicate on a HAM radio is simplex. This means that you have the same channel for transmitting and receiving. On the 2 meter band, you can use
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About Repeaters. A repeater is a station that receives incoming signals and retransmits them on a different frequency. The main purpose of repeaters is to extend the operating range of mobile stations, or stations in lower-lying areas or remote locations where simplex communication is not normally possible.
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