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10ghz astronomy astrophotography ATA ccsds ce5 contests digital modes doppler dslwp dsp eshail2 fec freedv frequency gmat gnss gnuradio gomx hermeslite hf interferometry jt kits les lilacsat limesdr linrad microwaves mods moonbounce noise orbital dynamics outernet polarization radar radioastronomy radiosonde rf amplifiers satellites sdr signal generators tianwen vhf & uhf vlbi