Set for DR3000: antenna, duplexer, feeder, lightning protection
Motorola DR3000 out of the box is only the “brain” of the point: in order for the network to work in the air, it needs an antenna with a feeder, a duplexer (or a second antenna), lightning protection, connectors and a place in the rack. None of these items are included in the repeater supply. Discuss the complete set - what is for and what is considered under the object.
Duplexer: one antenna instead of two
Repeater receives on one frequency and simultaneously transmits to another. If you connect it to one antenna directly, your own transmitter will shut down the receiver. The task is solved by a duplexer - a filter that dilutes reception and transmission on one feeder. The duplexer is matched to your frequency range and repeater power, so it is always counted after the allowed pair is known. The alternative is two spaced antennas: this is done when the design of the site allows you to spread them far enough, but on one mast, the duplexer is almost always more practical.
Antenna and feeder
The basic variant for the VHF range - BC-100 antenna: stationary, designed for permanent work on the mast. The range of the network is determined primarily by the height of its suspension, this is detailed in the technical guide. "When the network needs its own tower". Between the antenna and repeater is the feeder: a simple rule works here - the longer the track, the thicker the cable. A thin cable on a long track eats up a tangible part of the power both in transmission and in reception; we count the make and cross-section by the length of the track of a particular object.
Storm protection and grounding
The antenna on the mast is the highest point of the object, and the entire induced discharge goes down the feeder, right into the repeater. Lightning arrester LP-350 It crashes into the antenna path at the entrance to the room and discharges the discharge to the ground circuit. This is an inexpensive position that protects the most expensive: without a discharge, one thunderstorm season can end with repairs of both repeater and connected equipment.
Connectors, rack, power supply
To connect subscriber and service lines to the back panel serves PMLN5072 26-pin connector family DM3000/DM4000/DR3000. The repeater itself is a housing 19" 3U high and about 14 kg, so it needs a rack or a durable shelf with ventilation. power supply is a built-in 100-240 V unit; if the object suffers from interruptions, a power supply reserve should be provided for the replacement and restart of the network. And one more point, which is not iron: a resolution for a couple of frequencies - without it the kit can not run, this is honestly in the technical guide. tower.
Frequent questions about the kit
Is it possible to use one antenna? Yes, through a duplexer; without it, you need two spaced antennas.
What cable do you need? Depends on the length of the track: the longer, the thicker; count after measurement.
Do you have to protect yourself? With an antenna on the roof or mast, yes, it is the protection of the repeater itself.
What have you got? DR3000, BC-100 antenna, LP-350 lightning discharger, PMLN5072 set - in the catalog; duplexer and feeder count under the object.
Where to start?
Write down where the point will be (the height of the mast, the length of the track to the equipment, whether there is a grounding) and what pair of frequencies is allowed - we will collect the kit completely and say that it is already in stock. Package and availability are specified by email.
