hamclock.com

Acknowledgments

A lot of people’s work goes into what shows up on your clock. Everything below is either code running on this server or a data feed it depends on.

Software

Elwood Downey, WBØOEW Silent Key

Elwood created HamClock and maintained it for the better part of a decade, through the October 2017 QST article and every release up to v4.22. This server exists to keep the clocks he designed running.

Open HamClock Backend AGPL-3.0

The OHB project is rebuilding the backend side in the open, and code from it has been integrated here as needed to keep pace with a rapidly evolving front end.

This backend incorporates code from openhamclock/open-hamclock-backend, copyright © 2026 Open HamClock Backend (OHB) Contributors, licensed under the GNU Affero General Public License v3.0. Modified for use here. Read the license.

Data Sources

NOAA SWPC Solar wind, planetary K-index, GOES X-ray flux, and the OVATION aurora model.
SatNOGS DB Satellite transmitter frequencies, modes, and transponder passbands.
AMSAT Active amateur satellite element sets.
Paul Herrman, NØNBH HF band condition summaries via hamqsl.com.
PSKReporter Live digital-mode reception reports.
Reverse Beacon Network Automated CW and digital skimmer spots.
VOACAP HF propagation prediction engine, from the work of Greg Hand and the ITS team.

— and many, many others.

hamclock.com is operated by Bruce Edrich, W4BAE. 73.