铷原子钟FE-5680A的输出频率调整.pdf

《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