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When the noise floor limits are being bypassed because of strong interference, sensitivity is also reduced. In order to recover from this as quickly as possible, trigger a long periodic calibration every second instead of every 30 seconds, until the NF median is within limits again. This is especially important if the interference lasts for a while, since it takes multiple clean NF calibrations to bring the median back to normal. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>