V1.0
INSTALLATION & TROUBLESHOOTING GUIDE
AvMesh
TM
RF Communications Systems
Page 1: ...V1 0 INSTALLATION TROUBLESHOOTING GUIDE AvMeshTM RF Communications Systems...
Page 2: ...2 Version No Description Date Author Reviewed Approved Design 1 0 Manual Launch April 2019 P Naidu J Ohle W Evans M Sugars...
Page 3: ...to Noise Ratio SNR or S N 19 4 0 AvMeshTM Communications System Theory of Operation 20 4 1 Node Information 20 4 2 Network set up procedure 21 4 3 Network bridging 24 5 0 Avlite Wireless Remote Contro...
Page 4: ...me a primary node 21 Figure 10 The nodes are configured as primary if they are not within range of at least 3 other primary nodes 22 Figure 11 If the node is within range of at least 3 other primary n...
Page 5: ...work A local network architecture in which the nodes connect to as many nodes as possible and cooperate with one another to transfer data from point to point Noise floor This is the measure of signal...
Page 6: ...s and connect to all other nodes that are nearby in the mesh network The nodes send signals to other nodes that are within range and the signals are passed from node to node until the final destinatio...
Page 7: ...ticular direction Figure 2 Radio Communications System In radio frequency communication electromagnetic waves signals are created and radiated from a source i e transmitting antenna at the transmitter...
Page 8: ...d with a carrier signal or other competing signal of frequency f2 These signals will be present at the output along with additional signals called intermodulation products which are at the sum and dif...
Page 9: ...therefore essential to calculate the 3rd order harmonics and intermodulation products for all combinations of competing frequencies in a site to determine if there is a possibility of interference An...
Page 10: ...ination of the transmitted signal is not known and hence coverage in all directions from the antenna is required Antennas operate by concentrating the radio frequency energy they radiate or receive in...
Page 11: ...the received signal level will occur Once a signal has been transmitted its polarization should remain the same However reflections refractions and diffractions occurring between the receiver and tra...
Page 12: ...e transmitter will be a quarter of the signal strength at one meter away from the transmitter The basic formula above can be altered to take into account other factors that can influence the radio sig...
Page 13: ...zones for more information Interference can be defined as any external factor such as physical obstacles noise or other radio signals that degrade or reduce the clarity of the desired radio signal Th...
Page 14: ...iver compared to the waves that have travelled in the direct path This difference in time and path length causes a phase change of the radio waves in the altered paths and they can arrive either in ph...
Page 15: ...GHz ISM band Because of their cost effectiveness easy set up and easy maintenance unlicensed bands are a popular choice for many other systems as well Consequently this makes them susceptible to inter...
Page 16: ...d up by the transmitting antenna passes through an attenuator and low pass filter and then enters a mixer where it is mixed with another signal f2 generated by the local oscillator This results in the...
Page 17: ...or comparing two values and is used primarily as a comparison of power level although the ratio is applicable for other values such as voltage and intensity as well By using a logarithmic scale the de...
Page 18: ...otation of the Decibel typically follows the form dBx where x is the reference unit Common dBx terms are shown below Decibels relative to 1 milliwatt dBm Decibels relative to 1 Watt dBW Decibels relat...
Page 19: ...ge i e Volts millivolts microvolts etc These measured values are obtained from the Spectrum Analyzer as it shows the signals on a graphic display If the strength of the desired signal is equal to the...
Page 20: ...over the top of the controller or each other It is important to note that for distances greater than the operational range of the lights there may be a delay in those lights receiving the information...
Page 21: ...nodes are therefore required to behave as both a transmitter and receiver Upon first start up or after 10 days of operation each light node in the system runs through a network set up procedure in wh...
Page 22: ...n range of at least 3 other primary nodes after receiving the signals broadcasted from the other primary nodes and will change from a listen only node to a reserve node instead Since this is the very...
Page 23: ...same network ID as the one set by the very first reserve node Eventually the next node to turn on i e node 8 in figure 12 will be within range of at least 3 primary and 3 reserve nodes and will theref...
Page 24: ...des 1 2 and 4 at one end of the runway have become primary nodes as per the network set up procedure and they will share the same network ID e g network 132 Since nodes 9 11 and 12 are not within rang...
Page 25: ...is lower than network 153 and hence node 5 will offer to become a primary node and bridge node 9 with the better network This will be the lower network ID network 132 with the 8th bit cleared which g...
Page 26: ...sult in one network ID being used by the primary nodes throughout the system Figure 18 All primary nodes will adopt the better network 1 2 3 4 5 6 7 8 9 10 11 12 4 4 4 1 2 3 4 5 6 7 8 9 10 11 12 4 4 4...
Page 27: ...tion modes that can be selected via the Avlite wireless remote controller are shown below ALWAYS ON The light will remain on during both day and night and will only turn off when the battery drops bel...
Page 28: ...cification level compliant The LED high intensity timeout feature allows the LEDs in the light to revert from high intensity to low intensity after a defined period of time i e timeout duration The th...
Page 29: ...h response For the Yes response the light will turn off for 1 second turn on for 1 second and then turn off for 1 second For the No response the light will turn off for 1 second flash twice i e the li...
Page 30: ...able as default Radio Information Displays the unique ID code for the radio module There are no user adjustable settings for this menu option Radio Channel Select from either Encrypted or Unencrypted...
Page 31: ...rcing a light to be a primary node is below 1 Turn the Avlite wireless remote controller on 2 After the initialization period hold down the menu button for 3 seconds to enterthe Controller Setup Menu...
Page 32: ...e to the ground there is a high possibility that the first Fresnel zone will not be cleared because it will be impinged by the surface of the Earth and obstruct the signal propagation between the ligh...
Page 33: ...problem as a preliminary step to contacting the Avlite technical services team 9 0 Troubleshooting 9 1 Identifying the Problem Airfield not functioning as expected Start Is the whole airfield non fun...
Page 34: ...ith handheld controller Does light respond Contact Avlite technical services End YES YES NO YES NO Start Check Battery Voltage Is Battery voltage above flat battery threshold Refer to the appropriate...
Page 35: ...me unresponsive 2 Install a high gain antenna Check if whole runway becomes responsive Is whole runway responsive Contact Avlite technical services End NO YES Start Check Controller Battery Is Control...
Page 36: ...as adjacent to and around dead spots as recommended by Avlite technical services Test system at long range See next page NO YES Start Check housekeeping Grass is mowed around runway Line of sight is a...
Page 37: ...interference Clear indication of interference Send information to Avlite YES Contact Avlite technical services NO Is whole runway responsive End YES Test system at long range Verify radio interference...
Page 38: ...38 Notes...
Page 39: ...AvMesh RF Communications Systems Installation Service Manual Latest products and information available at www avlite com 39...
Page 40: ...ailable Avlite Systems Australia 61 0 3 5977 6128 Avlite Asia Pte Ltd Singapore 65 6908 2917 Avlite USA LLC USA 1 603 737 1311 We believe technology improves navigationTM avlite com info avlite com Ai...
