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How do communication repeaters work?
A radio repeater simultaneously receives a radio signal and re-transmits it at a higher power so it can cover greater distances. Repeaters receive radio waves on one frequency, called the “input” frequency, and then re-transmit the information on its “output” frequency.
Are Crossband repeaters legal?
There is a lot of discussion, but no real consensus that the cross-band repeat function is totally legal according to FCC rules. Most manufacturers have implemented the function in a way that causes unidentified transmissions, Here’s the scenario: When you transmit, you identify your transmission with your callsign.
What is a repeater on a scanner?
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. Some repeaters use two different frequency bands to provide isolation between input and output or as a convenience.
How far can a radio repeater reach?
Repeaters within signal range of each other cannot transmit on the same frequency and PL tone without causing interference. Repeater range is roughly 25 miles. Areas of higher network usage require more repeaters than areas of less network usage in order to provide coverage for all operators and minimize interference.
Do you need a transceiver to use a repeater?
To use a repeater, you must have a transceiver that can transmit on the repeater’s input frequency and receive on the repeater’s output frequency. The input and output frequencies are separated by a predetermined amount that is different for each band.
What do you need to know about ham radio repeaters?
Downlink: This is the frequency that the repeater uses to transmit. In other words, when people talk on this repeater, this is the frequency you use to hear them. Uplink: The receiver listens on this frequency. If you want to talk to people who are listening to this repeater, you need to transmit on this frequency.
Do you need an offset for a repeater?
Most repeater installations use the same antenna for transmit and receive. Without having an offset of 600 kHz the repeater would simply hear itself when it was transmitting on the same frequency it was listening on. Even with the offset, the two frequencies are close enough that some isolation is required.
Which is the repeater frequency for HT radio?
Each station monitors the repeater using a frequency of 447.725 MHz. When the pedestrian HT radio operator transmits his signal (red arrows), the 442.725 MHz transmission is received by the repeater and it retransmits the signal on 447.725 MHz to be received by any other stations monitoring that repeater frequency.