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ID:56980385
大小:628.00 KB
页数:6页
时间:2020-07-30
《铷原子钟FE-5680A的输出频率调整.pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Langenbrettach,February18th2008MatthiasBoppAprecisereferencefrequencynotonlyforyourhamradiostationRev0.4Ahamradiostationneedsastablereferencefrequencyifyouwanttomovetoveryhighfrequenciesoroperatingmodeswithverynarrowbandwidths.Probablytheworstcaseisreachedifbothaspectscombinelik
2、eitisthecaseindeepspacesatellitecommunication:1.)Duetotheveryhighdistancesbetweenthesatelliteandthegroundstationtheoperatingfrequencyismoveduptomakeuseofhighgainantennaswithareasonablesize.2.)AtthesametimethebandwidthofthesignalisreducedtoachievehigherS/Nratios.Iintendtopreparem
3、yselfforthereceptionofdeepspacesatellitesignalsasthenextgenerationofhamradiosatellitesisindesignandwillhopefullybelaunchedinthenext2years.ThereforerecentlyIstartedtoworkonasuitableconceptforthelocaloscillatorgenerationofmysystem.IdecidedtobuyasurplusRubidiumFrequencyStandardands
4、electedthemodelFE-5680AfromFrequencyElectronicsInc.AftersomesearchIboughtminefromGuyOvadia(guy@orcon-tech.com)whoprovidedaveryprofessionalandkindservice.IhavechosenaversionoftheFE-5680Amodule,whichincludesaDDS(directdigitalsynthesis)ICAD9830AfromAnalogDevicesandthusprovidesasinu
5、soidaloutputsignalofapprox.6dBmwithauserspecifiedoutputfrequencyfrom1Hzto20MHz.This“Option2”allowstheremoteadjustmentoftheoutputfrequencybyacomputerthroughanRS-232interface.PleasenotethattherearemultipledifferentversionsoftheFE-5680Aavailable.Thismodulehasthesize.98x3.47x4.92inc
6、hesrespectively25x88x125mm.Theinputpowerof15VDCissuppliedthrougha9-pinSub-Dconnector.Thecurrentconsumptionisapprox.2Aduringthestart-uptimeandoncetheoperatingtemperatureofthemoduleisreacheditisreducedto0.75A.MymoduledidnotsupplytheRFsignaloutsidethemodulenorwastheRS232connectione
7、xternallyavailable.Youwillfindinstructionsonthenecessarymodificationslaterinthisarticle.RubidiumFrequencyStandardFE-5680AHereisthepin-outofthe9pinSUB-Dconnector:PINFUNCTIONNOTESJ1-1+15VDCpowerinputJ1-2GROUNDProvidesDCreturn,RS-232returnJ1-3LoopLockIndicatorIndicateswhetherornott
8、heoutputfrequencyisstabilizedtotheRbatomicrefer
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