MONITORING INTERFERENSI FREKUENSI KOMUNIKASI VHF AIR TO GROUND BERBASIS SOFTWARE DEFINED RADIO
VHF A / G communications are very susceptible to communication frequency interference at airports. Because of this uncontrolled frequency disturbance it can interfere with the provision of air traffic guidance services. In accordance with the Regulation of the Minister of Transportation number: KM 27 of 2005 concerning the Enforcement of the Indonesian National Standard (SNI) 03-7097-2005 regarding very high frequency ground to air communication equipment (VHF-Air-Ground) at airports as a mandatory standard. Therefore it is necessary to have a tool that can monitor the VHF A / G communication frequency. The device used to monitor VHF A / G frequencies is the RTL-SDR R820T receiver. The receiver is a wideband receiver with a frequency range of 24 MHz - 1700 MHz. Then the RTL-SDR R820T receiver that is already connected to the monitor can enter the software processing stage. By using SDR software you will see a graph of the frequency spectrum and can also listen to the audio. Furthermore, the LDR sensor is mounted in front of the SDR (software defined radio) monitor as a graphical motion reader on the SDR monitor screen. Where the SDR screen contains motion graphics built from software defined radio. If the LDR receives light and reads the motion graph from the SDR monitor where the range for friend and unfriend frequency has been set, it will be processed in Arduino to program some output, namely, turning on the red led when unfriend and the green led for friend, displaying an event sign on the dot matrix LED, The announcer voice states the friend and unfriend condition of the frequency and the logger data is used as the frequency monitoring history database.
Keywords: RTL-SDR R820T, Software Defined Radio, Arduino.