KXFL3-Option-Rev-A3操作说明书手册

Elecraft®KX3KXFL3 Roofing Dual-Bandwidth FilterInstallation and Calibration InstructionsRevision A3,June 4,2015Copyright 2015,Elecraft,Inc.,All Rights ReservedIntroductionThe KXFL3 is a high-performance,narrow-band analog filter module that helps reject strong signals that couldcause receiver blocking(desense)or intermodulation distortion.It adds two additional bandwidths to the KX3that are automatically selected as the receive bandwidth is adjusted.If your KXFL3 was supplied with either a factory assembled KX3 or a kit KX3,it was calibrated at the factoryAll you need to do is install it as described below and enable the module as described in your KX3 owner'smanual.If you obtained your KXFL3 module separately or are moving it to another KX3,you must calibrate itas described on page 4 for optimum performance.ACAUTIONThe KXFL3 module and many components inside your KX3 may be damaged byElectrostatic Discharge (ESD)simply by touching them or a circuit board containingthem unless you take specific steps to prevent such damage.See PreventingElectrostatic Discharge Damage on page 2 before opening the package containing theKXFL3 module or working inside your KX3.SpecificationsFilter type:Two filters,each having dual balanced Butterworth sectionsGain/phase match:Typ.0.1%.Additional matching accuracy provided by DSPtechniques.FL2:1500 or 3000 Hz low-pass,depending on demodulation method in use.*FL1:500 or 1000 Hz low-pass,depending on demodulation method in use.The narrower bandwidths apply in all modes except when Weaver-mode SSB demodulation isbeing used.Filters switch in at predetermined points in each mode,varying with passband centerpitch,width,and shift amount.