projekte:3cmbeacon:start
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Beide Seiten der vorigen RevisionVorhergehende ÜberarbeitungNächste Überarbeitung | Vorhergehende ÜberarbeitungLetzte ÜberarbeitungBeide Seiten der Revision | ||
projekte:3cmbeacon:start [2023/01/06 18:30] – thasti | projekte:3cmbeacon:start [2023/01/07 11:22] – [Integrated 10 GHz Beacon Transmitter] thasti | ||
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====== Integrated 10 GHz Beacon Transmitter ====== | ====== Integrated 10 GHz Beacon Transmitter ====== | ||
- | After the decline in use of ATV in Germany, an idea of building a 3 cm beacon at [[https:// | + | After the decline in use of ATV in Germany, an idea of building a 3 cm beacon at [[https:// |
The goal of this project was building a 10 GHz beacon transmitter suitable for long-term unsupervised operation from commercially available integrated circuits. To make full use of the transmit power constraints in Germany, an output power of 1-2 W was targeted. Support for contemporary digital beacon transmission modes such as [[https:// | The goal of this project was building a 10 GHz beacon transmitter suitable for long-term unsupervised operation from commercially available integrated circuits. To make full use of the transmit power constraints in Germany, an output power of 1-2 W was targeted. Support for contemporary digital beacon transmission modes such as [[https:// | ||
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===== Architecture ===== | ===== Architecture ===== | ||
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A simple block diagram of the beacon transmitter is shown in the figure below. | A simple block diagram of the beacon transmitter is shown in the figure below. | ||
- | ~TODO~ | + | {{ : |
The beacon transmitter accepts an external 100 MHz reference clock provided by a GNSS-disciplined oscillator. GNSS stabilization is the de-facto standard for beacons on 10 GHz and above due to their narrow spacing and small bandwidth. It also enables receiving stations to use the beacon as a frequency reference for aligning their own equipment. | The beacon transmitter accepts an external 100 MHz reference clock provided by a GNSS-disciplined oscillator. GNSS stabilization is the de-facto standard for beacons on 10 GHz and above due to their narrow spacing and small bandwidth. It also enables receiving stations to use the beacon as a frequency reference for aligning their own equipment. | ||
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+ | {{ : | ||
A Silicon Labs Si5342 is used as a crystal-driven reference PLL, which takes care of reference clock jitter cleaning and modulation generation. The high-resolution fractional divider allows synthesizing sub-Hz frequency steps of the output RF carrier, which are required for modern modulation formats. Due to the architecture of the synthesizer, | A Silicon Labs Si5342 is used as a crystal-driven reference PLL, which takes care of reference clock jitter cleaning and modulation generation. The high-resolution fractional divider allows synthesizing sub-Hz frequency steps of the output RF carrier, which are required for modern modulation formats. Due to the architecture of the synthesizer, |
projekte/3cmbeacon/start.txt · Zuletzt geändert: 2023/01/23 19:42 von thasti