Amateur frequency resources are provided by the country to all hams, so repeaters working in the amateur band, even if you set up and maintain them yourself, need to provide services for all hams in the coverage area, let's learn together today What problems should be paid attention to when setting up an amateur repeater.
The analog repeater can provide one set of repeater frequencies, and the DMR repeater can provide 2 sets of repeater frequencies. This is because the DMR repeater can uses both slot1 and slot2 for transmission, and one minute is divided into 2 groups. Each slot is 30 seconds, and each slot can send a set of frequencies. Applying for a set of frequencies can be used by two groups of people without interfering with each other.
When selecting the repeater frequency, it must comply with the recommendation table in the annex of the "Amateur Radio Operation Certificate Grade Standard". In addition, when selecting the amateur repeater frequency, it should be monitored for a certain period of time to confirm that the selected frequency has no frequent interference.
The purpose of amateur repeater is to expand the communication distance, so to set up the repeater, we must first determine the coverage, then determine the installation location. In order to ensure uniform coverage, it is best to choose a commanding height near the geometric center of the expected coverage area when using an omnidirectional antenna, and a commanding height outside the expected coverage area but close to the coverage area can be selected when using a directional antenna.