2.7.0 spase://HamSCI/Instrument/PSWS/Grape1Legacy/KD8CGH_Node_22 HamSCI Grape 1 Legacy (fldigi-based Doppler Receiver) at KD8CGH Node 22 station Grape 1 Legacy at KD8CGH Node 22 station 2025-09-04T10:00:00 The Grape 1 Legacy Doppler Monitor (fldigi version) is a citizen science instrument developed as part of the HamSCI Personal Space Weather Station (PSWS) project. It is a low-cost, easy-to-assemble system designed to receive, analyze, and record signals from frequency standard stations such as WWV, WWVH, and CHU. Using a low-IF receiver board, a GPS-disciplined oscillator (GPSDO), and a Raspberry Pi running a custom HamSCI fldigi-based image, it measures Doppler frequency shifts caused by ionospheric variations on a 24/7 basis. Data is typically recorded in CSV format. Grape 1 systems have been operational since 2019 and have been used in studies of space weather impacts, including during the 2024 North American total solar eclipse. The Grape 1 is a receive-only device and does not require a ham radio license to operate. The KD8CGH Node 22 station is located at 41.167ºN, 81.417ºW. Instrument type is Grape 1 Legacy. There is one antenna at this station, which is Antenna 1: tuned small loop antenna. It records WWV 10MHz Doppler Shift. spase://SMWG/Person/Nathaniel.Frissell PrincipalInvestigator spase://SMWG/Person/William.Engelke TechnicalContact spase://SMWG/Person/Kornyanat.Hozumi MetadataContact Experiment HamSCI Personal Space Weather Station (PSWS) 2021-08-01T00:00:00 Data are current to within about one day. spase://HamSCI/Observatory/HamSCI