KiwiSDR Conference Talks: KiwiSDR and it’s GPSDO, TDoA Geo-Location and GNURadio Sources

Thank you to John ZL/KF6VO (creator of the KiwiSDR) for submitting some interesting KiwiSDR related conference talks that might be of interest to some readers. If you were unaware the KiwiSDR is a US$299 HF SDR that can monitor the entire 0 – 30 MHz band at once. It is designed to be web-based and shared, meaning that the KiwiSDR owner, or anyone that they’ve given access to can tune and listen to it via a web browser over the internet. Many public KiwiSDRs can be found and browsed from the list at or by signal strength and location on this website. One of the most interesting KiwiSDR features is it’s TDoA capabilities, which allow users to geographically locate HF transmitters.

Introduction to the KiwiSDR and Bodnar GPSDO

Rob Robinett, AI6VN, gave a talk at the HamSCI Workshop 2019 (USA) “Introduction to the KiwiSDR and Bodnar GPSDO”. In addition to Kiwi basics he shows a live demo of the performance advantages in using an external GPSDO as the Kiwi ADC clock. A line-of-sight measurement of frequency/time station WWV in Colorado using the Kiwi’s internal GPS-compensated crystal oscillator (XO) is compared against using an external Bodnar GPSDO. The Kiwi’s IQ display extension shows the frequency/phase difference between the ADC clock, internal or external, and WWV. Rob also discusses the publicly available ( eight Kiwi installation he made at coastal radio station KPH north of San Francisco. 


Christoph Mayer, DL1CH: KiwiSDR as a new GNURadio Source