as3935
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| as3935 [2024/04/12 21:15] – river | as3935 [2024/07/25 22:33] (current) – [Calibration] river | ||
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| A badly designed, pulled, aged, uncompensated crystal oscillator might be 50ppm off, so much better than needed as a calibration standard for this application. Therefore can use a µC to calibrate it automatically. I don't see this done in the Sparkfun library even though it seems obvious. | A badly designed, pulled, aged, uncompensated crystal oscillator might be 50ppm off, so much better than needed as a calibration standard for this application. Therefore can use a µC to calibrate it automatically. I don't see this done in the Sparkfun library even though it seems obvious. | ||
| - | The chip can the calibrate its clocks from the above value, so antenna should be trimmed first. | + | The chip can then calibrate its clocks from the above value, so antenna should be trimmed first. |
| Clocks calibration must be repeated after power loss. | Clocks calibration must be repeated after power loss. | ||
| Line 222: | Line 222: | ||
| (Not extensively tested, maybe reading other registers works too.) | (Not extensively tested, maybe reading other registers works too.) | ||
| - | I read than some boards have wrong tuning caps. I couldn' | + | I read that some boards have wrong tuning caps. I couldn' |
| ===== Links ===== | ===== Links ===== | ||
as3935.1712956508.txt.gz · Last modified: 2024/04/12 21:15 by river