1. ARGOS receiver 1GHz … 2GHz → 0.1MHz…1GHz Components panel Front panel Back panel and connectors

2. Localoscillator #1 10,000GHz 13dBm min Aircable from antenna-tower to receiver -10dB @ 1,415GHz RF-amplifier / equalizer att -3dB 1. mixer IF-isolator -0,7dB 1. IF-filter 8,500GHz B3dB=+-500MHz=1GHz -1dB BPF 2. mixer LO-isolator 2. IF amplifier 0.1MHz...1GHz Overview Digital FFT Radio-Spektrograf File: RX1GHz.pptRevision: 1.5 Updated by: Chr. Monstein, 21.05.2004 Created by : Chr. Monstein, 13.12.1999 Astronomical Institute ETHZ Synthesizer- isolator 26dB min NF<5dB IFRF LO RFIF LO 41dB -6dB 15dB att -3dB 1. IF-amplfier 8-12,4GHz ADC 8bit 2Gs/sec PC & FFT Lowpassfilter F3dB=1GHz a=-1dB Localoscillator #2 9,000GHz 13dBm min Frf Fsy IF1 IF2 IF2=IF1-Flo IF1=Fsy-Frf Frf=Fsy-IF2-Flo IF2=Fsy-Flo-Frf Flo IF-isolator -0,7dB Level: 104dB SMA- bridge SMA- bridge N/SMA Power Divider -6dB +6dBm+-3dBm 10MHz Ref. Input Power Divider -6dB Log. Detector Video out N/SMA +15V RX3 N/SMA DSP +5.0V

3. Frequency diagram F1h=9,00GHz F1z=8,50GHz F1l=8,00GHz Fh=2,0 GHz Fl=1,0 GHz Power Frequency 1. mixer stage F2h = 1000 MHz F2l = 0.1 MHz 2. Localoscillator LO2 = 9,000 GHz Power Frequency 2. mixer stage Selection with lowpassfilter F1 = LO1 ± Frf = 8,500 GHz ± 500 MHz F2 = F1 - LO2 = 500 MHz ± 500 MHz Upper sideband USB will not be used Selection of lower sideband LSB by bandpassfilter Frf =1,5 GHz 1. Localoscillator LO1 = 10,000 GHz

4. ARGOS receiver as a frontend to CALLISTO radio-spectrometer ARGOS baseband 0.1MHz…1GHz received by CALLISTO which accepts 45MHz…870MHz Input freqeuncy