JP frequency - 20mW limit, change freqs to avoid duty cycle #4446
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May need to account for remapping channel slots. JPN Slot 20 been default for Public LongFast and been above 923Mhz |
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Conclusion from discord discussion is:
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fifieldt
commented
Aug 12, 2024
Thanks to user Goyath on Discord, we discovered that in Japan the
250mW radio level requires licensing, and 20mW is the practical
limit. We also discovered that a duty cycle of 10% is needed on
most frequencies.
CH 24-38 920.5-923.5 20mW no airtime restrictions
CH 39-61 923.5-928.1 20mW 10% airtime
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fifieldt
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It looks like we discovered this some time ago: #346 but it got left off the task list somehow |
andrekir
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Aug 25, 2024
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Just passing by & just FYI, 920MHz low-power in JP is indeed license free but modems need to be type certified and 〶[R]xxx-xxxx marked for full legal conformance, similar to Wi-Fi cards |
danwelch3
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Oct 3, 2024
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Thanks to user Goyath on Discord, we discovered that in Japan the 250mW radio level requires licensing, and 20mW is the practical limit. We also discovered that a duty cycle of 10% is needed on most frequencies:
This patch limits the power and restricts the frequency to those with no airtime restrictions.