RFI measurement in Tibet Jianli Zhang 5/8/2014. Equipment 1 butterfly antenna 4 amplifiers (60dB) A li-battery for amplifiers (12V) Spectrum analyser.

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Presentation transcript:

RFI measurement in Tibet Jianli Zhang 5/8/2014

Equipment 1 butterfly antenna 4 amplifiers (60dB) A li-battery for amplifiers (12V) Spectrum analyser Cables

Settings for spectrum analyser: Spectrum analyser with RBW = 30kHz, Attenuation=0dB. Frequency range = 100KHz-300MHz Set sys-settings-input/output, 75ohm(In YBJ 50ohm) For all measurement go to ’Averaging’ mode on the Spectrum Analyser, with at least 10 measurements for 1 average track.

Four measurements for one site Amplifiers + SpectrumAnalyser (end of antenna output cable unplugged). All electronics OFF. Amplifiers + SpectrumAnalyser (end of antenna output cable unplugged). All electronics ON. Antenna+ Amplifiers + SpectrumAnalyser (antenna output cable plugged). All electronics ON. 1 measurement at Galactic minimum (~11:30am in summer in YangBajing China) with antenna oriented E-W, one with N-S. Same as 3., but now at Galactic maximum (~23:30pm midnight in summer in Yangbajing China)

Position: 30°6'7.82“N 90°31'25.92“E With LNA#4 and #5 Spectrum analyser 50 Ohm The distance from antenna to Spectrum analyser 6m There was a storm at 6pm( ) YangBaJing

Galactic max and

Dingri Position: 28°34'9.13" N 86°51'21.95" E With LNA#1 and #2 Spectrum analyser 75 Ohm The distance from antenna to Spectrum analyser about 6m The height of the antenna is about 1.3m

Galactic max and

With Li Jianbi’s With LNA#1 Desktype spectrum analyser 50 Ohm

PuMaJiangTang Position: 28°34'16.43"N 90°11'34.06"E With LNA#1 and #2 Spectrum analyser 75 Ohm 100 measurements for this track The distance from antenna to Spectrum analyser 6m The height of the antenna is about 1.4m