Hytera RD985 Repeater

Installing a Radio Repeater

Installing a radio repeater has two advantages.

The first advantage is an increase in communications range.

The second advantage is that it overcomes signal dead spots.

What I mean by dead spots, are areas of the desired coverage area, that radio signals cant reach.

Reasons for dead spots

Dead spots are caused by the received signal being too weak, or blocked.

If the received signal is too weak, then it is below the set signal threashold, to operate the receiver.

Signal attenuation is the term for the signal being weakened.

Objects in the landscape between the transmitter and receiver, will attenuate the signal strength.

Objects can be natural landscape features, or made by humans.

Natural features include valleys and caves.

Human made objects include buildings and bridges.

An alternative reason for dead spots is signal blocking.

The signal is blocked by certain materials used in buildings, such as metal.

Hills and mountains will also block the signal, as they are too thick for the signal to pass through.

What does it do

The repeaters purpose is to boost the signal strength.

It does this by receiving a weak signal, and simultaneously re-transmitting it.

The re-transmitted signal is much stronger than the received signal.

The stronger signal therefore boosts communication range.

Different Types

There are several different types of repeater.

Older repeaters will be analogue.

Newer repeaters will be digital, or capable of both.

The two main digital repeater standards are dPMR & DMR.

DMR standard is the most popular amongst manufacturers, and hence what we reccomend.

We reccomend DMR, as there is more equipment available.

VHF or UHF

Another consideration when installing a repeater, is radio frequency.

VHF is short for Very High Frequency.

UHF is short for Ultra High Frequency.

VHF and UHF are known as frequency bands.

VHF frequencies range from 30 MHz up to 300 MHz.

UHF frequencies range from 300 MHz to 3 GHz.

Written by: Craig Miles

    hytera repeater

    Lincoln Radio Repeaters

    Lincoln radio repeaters boost the communications range of two-way radios.

    Location

    If you plan to install a repeater around lincoln, there are coverage issues to consider.

    There is a ridge at the top of lincoln.

    This means that if you place a repeater at the top of the ridge, at somewhere like Cherry Willingham, you may not receive a signal on Carholme Road, Lincoln.

    This of course works in reverse, so a repeater located in North Hykeham, may not reach Nettleham.

    This can of course be overcome.

    Height

    Radio signals above a frequency of 30MHz (MegaHertz), are generally ‘line of sight’.

    Line of sight basically means they travel in straight lines.

    Objects such as hills, buildings, and ridges block or attenuate (reduce) the signal strength.

    One way to improve the line of sight, is to put the antenna on a high mast, or location.

    This can help overcome the curvature of the earth, but may not provide 100% coverage.

    This is because in the case of the Lincoln ridge, there is a blackspot, that occurs, unless you had your repeater at the top of the ridge.

    IP Connect

    If 100% radio coverage around the lincoln area is crucial, IP Connect can be used.

    IP Connect uses the internet to connect more than one repeater together.

    This can be configured to create a wide area system, with full coverage.

     

     

     

    Technologies

    There a three types of repeater you will come across.

    Analogue

    Analogue repeaters are becoming less common now.

    An analogue repeater receives a weak radio signal from an analogue transmission.

    Then the repeater retransmits the signal, at a higher power.

    This enables the radio communication range to increase.

    An analogue signal consists of a ‘carrier’ signal, and a modulated variable signal.

    The modulated signal is put onto the carrier, and contains the speech data.

    Two types of modulation are common.

    These are Frequency Modulation, and Amplitude Modulation.

    Frequency Modulation

    Frequency Modulation is more commonly known as FM for short.

    FM is what traditional analogue repeaters normally use.

     

    Amplitude Modulation

    Amplitude Modulation is often abreviated to AM.

    You are unlikely to see an AM repeater for sale these days.

     

    Digital Repeaters

    Digital repeaters are taking over from the older analogue repeater technology.

    Digital repeaters work by transmitting digital ‘0’s & ‘1’s, rather than modulating a signal onto a carrier frequency (analogue).

    Standards

    The two main standards you will come across are dPMR & DMR.

    DMR has become the more popular dominant standard.

    This means that there is more equipment available using the DMR standard.

    Trunked

    Trunked repeaters are analogue, though pseudo trunking is availabke in digital systems.

     

    All users of two way Land Mobile Radio Communications in Lincoln can benefit from the local lincoln Radio Repeaters available through Yesway.

    The radio repeater allows two way radio messages to be broadcast and received over a wider area than would be possible with ordinary radio to radio communications.

    The repeater can link mobile to mobile, mobile to base station & even link handheld walkie talkie style radios.

    This system often only needs a small base station aerial to access the repeater, which can often be mounted discretely in a loft for example.

    At yesway we are confident that the  trunked repeater system that we offer is superior to rivals conventional CBS radio repeaters in terms of coverage, and cost.

    If you have been quoted to have a system based on anyone else’s repeater system in the Lincoln area then contact us, and we are confident we will beat any genuine written quote.

    Author: Craig Miles