







ใใฎใใใในใๆ่จใฏใทใณใฐใซใใณใ้ปๆณขๆ่จใงใใๅฝ็ซๆจๆบๆ่ก็ ็ฉถๆ(NIST)ใฉใธใชๅฑWWVBใฏใใใฃใผใใซใใใพใใใณใชใณใบใฏใ60kHzใงๆๅ ฑใ้ฃ็ถ็ใซๆพ้ใใพใใ ใใฎไฟกๅทใฏใๆ้ท2000ใใคใซ้ขใใๅ ดๆใงใ้ท่ท้ข(AM)ใฉใธใชๅไฟกใๅฏ่ฝใช็ฑณๅฝๆฌๅใฎใฉใใงใๅไฟกใงใใพใใ WWVBในใใผใทใงใณใฏใใณใญใฉใๅทใใซใใผใฎNISTๅๅญๆ่จใใไฟกๅทใๅฐใๅบใใๅๅญๆ่จใฎๆๅปใจๆฅไปใ่ชๅ็ใซๆดๆฐใใๅคๆ้ใ่ชฟๆดใใพใใ ๆๅใซไฝฟ็จใใๅใซใ่ฆ่ฆ้ๅฎณ่ ใฎใใใซใฟใคใ ใพใผใณใใผใญใณใฐใฆใฉใใใ่จญๅฎใใฆใใ ใใใ








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