Seiko 3B51 - About Reception Conditions; Automatic Reception and Manual Reception; Mechanism of Radio Signal Reception; Radio Signal Reception Range

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HowtoSettheTime(RadioSignalReception)
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■ToImproveRadioSignalReception
※Thereceptionoftheradiosignalscannotbeconductedunlessthewatchisstill.
・ Placethewatchinaplacewhereitcaneasilyreceivearadiosignalsuchasnearawindow.
※Locationsoftransmittingstations→RadioSignalReceptionRangeIndicationpage92
Antenna
・Donotmovethewatchwhileitisreceivingradiosignals.
Toenhancethereceptionofradiosignals,donotmovethewatchordonotchange
theorientationofthewatchwhileitisreceivingradiosignals.
Theantennaisembeddedatthe8oclockpositionofthewatch.Turningtheantennatowardthe
outsideofawindoworthedirectionfacingtransmittingstationshelpsimproveradiosignalreception.
AboutReceptionConditions
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Thereceptionrange fromeach transmittingstationisapproximately
1,000km（1,000kmradiusofeachstation）.
Ohtakadoya-
yamatransmitting
station（40kHz）
Hagane-yama
transmitting
station（60kHz）
1,000km
1,000km
■RadioSignalReceptionRange:InJapan(JJY)
HowtoSettheTime(RadioSignalReception)
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※ NICT：N ationalInstituteofInformation
 andCommunicationsTechnology
※
Whetherthewatchsucceedsinreceivingradio
signalsornotdependsonthereceivingconditions.
 Referto"Aboutreceptionenvironment"onpage94.
JJYisoperatedbytheNational
Institute ofInformationand
CommunicationsTechnology（NICT）.
JJYistransmittedfromtwostations
inJapan.EachstationtransmitsJJY
inadifferentfrequency.
Fukushima（Ohtakadoya-yama
transmittingstation:40KHz）
Kyushu（Hagane-yamatransmitting
station:60KHz）
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HowtoSettheTime(RadioSignalReception)
※ IfthetimezoneissettoaregionotherthanTokyo(Japan),thesignalreceptionfunctionwillnotwork.Makesurethatthetimezoneisset
toTokyo(Japan).→HowtoSettheTimeZonepage104
※ Radiosignalreceptionresultsdependonareceivingcondition.→EnvironmentsinwhichitisDifficulttoReceiveaRadioSignalpage94
※ Thiswatchisunabletoreceiveradiosignalsoutsidethereceptionrange→RadioSignalReceptionRangeIndicationpage92
※ Whenthewatchisnotdisplayingtheprecisetimeevenaftersuccessfullyreceivingaradiosignal→Troubleshooting:Displayofincorrect
timeormisalignmentofthehandspage138.
・ ManualReception

Inadditiontotheautomaticreception,radiosignalreceptioncanbemanuallyconductedasnecessaryatanytime.
 →HowtoConductManualReception page126
・ AutomaticReception

Thiswatchsetsthetimebyautomaticallyreceivingaradiosignalatafixed
time.Itautomaticallyreceivesaradiosignalat2:00AMand4:00AM.
■AutomaticReceptionandManualReception
※Oncethewatchsuccessfullyreceivesaradiosignal,automaticreceptionisterminated.
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・ Placethewatchinaplacewhereitcaneasilyreceivearadiosignalsuchasnearawindow.
・Whilethewatchisreceivingradiosignals,donotmoveit.
→ToImproveRadioSignalReception page93
Theradio-controlledwatchdisplaystheprecise timeby automaticallyreceivingand
synchronizingitselfwiththeradiosignalofanofficialstandardfrequency.
Timesignaltransmittedbyastandardfrequencyisbasedonasuperaccurate"Cesium
AtomicClock"thatmayhavea1secondlossorgainperonehundredthousandyears.
■Mechanismofradiosignalreception
SettingtheTimeandDatebyReceivingaRadioSignal
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HowtoSettheTime(RadioSignalReception)
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Transmitting
Station
Cesium
AtomicClock
Officialstandard
frequency
Radio-controlledwatch
Receiveradiosignals
throughtheantenna
insidethewatch
↓
Analyzetime
information
↓
Displaythecurrent
time,