HF Receiver Project
There are currently many commerically available software defined radios (SDRs), but none seem to have all of the necessary features needed for an amateur personal space weather station, including cost, frequency accuracy/stability, timestamping, calibration, bandwidth, etc. We aim to create define the necesssary requirements and create an HF receiver suitable for amateur scientific work.
GPS Disciplined Oscillators
- Simple and Accurate Variable Frequency RF Signal Generator (Elwood Downey, WB0OEW, Reprinted with permission; September/October 2018 QEX, copyright ARRL.)
- The Use of GPS Disciplined Oscillators as Primary Frequency Standards for Calibration and Metrology Laboratories (Lombardi, 2008)
- U-Blox LEA-M8F Time and Frequency Reference GNSS Module Datasheet
The Red Pitaya is a (relatively) inexpensive multi-purpose development platform and lab instrument that can also be used as a 0.1-60 MHz SDR. While not entirely suited to radio science use, it provides a good starting point using commerically available hardware.
- Syncronize a Cluster of Red Pitayas
- W2NRL's PiRadar Red Pitaya Modifications
- Pavel Demin's Red Pitaya SDR Programs
- N5EG's GnuRadio HPSDR Block
- Information on 14:1 Impedance Transformer
A magnetometer that is usable for space science/space weather needs to have a resolution > 5 nT to be useful. Inexpensive magnetometers, such as the ones found in cell phones, are typically hall effect or magnetoresistive magnetometers with resolutions > 100 nT and are only sensitive to the very largest (rare) space weather events.
- British Geological Survey Raspberry Pi Magnetometer
- This appears to be adequate for space science/space weather, but still a little expensive.
- HoneyWell HMC100x Magnetometer Chip
- Specification Sheet
- Low-cost chip, but still uncertain that the resolution is adequate at low frequencies.
- Bridging the gap between AMR, GMR, and Hall magnetic sensors (Popovik et al., 2002)
Page Maintained by Dr. Nathaniel Frissell, W2NAF