HTime is a firmware extension for the HackRF One, the open-hardware/open-source SDR by Great Scott Gadgets. HTime provides the HackRF SDR with the capability to perform timed commands and a precise phase synchronization of internal clocks (sampling, MCU, output) for the best timing performance. HTime is developed by Fabrizio Pollastri.
- Unix-like time scale, with a resolution of 5 ns
- RX/TX sampling synchronized with the time scale
- Fine time scale/frequency adjust for synchronization with remote reference radio signals with a resolution of about 0.25 Hz @ 10 MHz
- No external hardware required
- Host time tool for access to time extension API
For now, HTime works only with a 10 MHz sample rate.
HTime is developed into a fork of the original HackRF repository, so all build and install rules for the original HackRF software apply also to HTime. Please, see the documentation at https://github.com/greatscottgadgets/hackrf
All other documentation about the HackRF can be found here.
HTime © 2025 documentation by Fabrizio Pollastri is licensed under CC BY-SA 4.0
HTime © 2025 software by Fabrizio Pollastri is licensed under GNU GPL v2.0