| Receivers for low-bandwidth optical (through-the-air) communications - KA7OEI |
| Receivers for low-bandwidth optical (through-the-air) communications - KA7OEI http://www.modulatedlight.org/optical_comms/optical_rx1.html https://translate.google.com/translate?sl=en&tl=pl&u=http://www.modulatedlight.org/optical_comms/optical_rx1.html |