Kvalitet i luftbibldet og ADS-B - Forsvarets forskningsinstitutt

adar at Kongsvinger. The zero-span mode did not show any pulses, this was probably caused bymissing or misunderstood pulse trigging capability.During all measurement descriptions in blue indicates original sensor parts.Measurement 1This measurement shows the signal environment (80 – 1200 MHz) at the output from the ADS-Bantenna.There are a large number of high signals from the civilian installation, but no continuoussignals were recorded close to 1090 MHz.20mMeasurement 2In this measurement the LNA of the ADS-B-system was included. The output of the LNA show a greatreduction of signal strength at low frequencies, but still some signals are getting trough.In the vicinity of 1090 MHz an unexpected large number of signal frequencies at considerable levelsare identified. From these measurements it is difficult to conclude whether these signals are realsignals at the site or intermodulation products caused by the LNA (or spectrum analyzer).to ADSBLNA20mFFI-rapport 2011/01500 27