OHB is an open-source, backend replacement for HamClock, consequently it maintains the HamClock interface by dynamically generating live propagation data, maps, and feeds. It can be hosted on compute as small as a Raspberry Pi3B+.
To use OHB as your backend server follow these instructions
If your HamClock runs as an app, e.g. on a Raspberry Pi just start it with the -b option ( -b ohb.hamclock.app:80)
The OHB service will always be free to use, so there is no need to donate. However, we do have costs so if you can afford to, and you want to, then a small donation towards these costs would be very much appreciated.
You are very welcome to use our backend server by simply pointing your Hamclock at: ohb.hamclock.app:80 which is run by a small group of radio amateurs. This is a dedicated server racked in a UK datacenter but can be used Worldwide.
Or you can host your own backend, in which case all maps and data feeds are generated on your own compute, furthermore OHB can be hosted on hardware as small as a Raspberry Pi 3B+
OHB serves data from its own internal services, it does not proxy any data from Clear Sky Institute, accordingly our project only uses publicly documented data sources and runs independently.
Each supporting file type has a data generation script running on a specifically tuned crontab, matched as closely as possible to the original data generation times while being friendly to CPU and memory.
We have built a community-powered backend to keep HamClock running, with this purpose in mind, Discord is where we collaborate, troubleshoot, and exchange ideas — no RF license required.
OHB is and always will be free to use and download.