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radio-settings.md - add note about TCXO stability

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Jm Casler 2021-02-03 01:04:23 -08:00
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@ -42,6 +42,7 @@ Considerations:
* * Each step up in Spreading Factor adds about 2.5db extra link budget. * * Each step up in Spreading Factor adds about 2.5db extra link budget.
* Bandwidth - How big of a slice of the spectrum we use. * Bandwidth - How big of a slice of the spectrum we use.
* * Each doubling of the bandwidth is almost 3db less link budget. * * Each doubling of the bandwidth is almost 3db less link budget.
* * Bandwidths less than 31 may be unstable unless you have a high quality Crystal Ossilator.
* Coding Rate - How much redundency we encode to resist noise. * Coding Rate - How much redundency we encode to resist noise.
* * Increasing coding rate increases reliability while decrasing data-rate. * * Increasing coding rate increases reliability while decrasing data-rate.
* * 4/5 - 1.25x overhead * * 4/5 - 1.25x overhead