Fangrui Product Details Fangrui Product Details Fangrui Product Details The Spectrum Mode Is Displayed In The Upper Right Corner Of The Spectrum, And The Mode Is Spectrum + Mode. The First Line Is The Center Frequency Center Frequency Power; The Second Line Captures The Strongest Or Weakest Frequency, Or The Specified Frequency And Power (displays The Capture Of The Strongest Signal In Capture Mode, And Of The Weakest Signal In Capture + Capture Mode , Adjust Duplexer Step Size) Frequency And Power) The Third Line Frequency Range (center Frequency Addition And Subtraction) Frequency Step; F1: Cursor Movement Center Frequency, Frequency Range, Step Cycle Selection (long To Select In The Spectrum And Mode); F2: Backspace. The Cursor Points To The Frequency Center: Enter Directly With The Numeric Keys Or Adjust The Frequency With The Up And Down Keys F3 And F4 To Adjust The Frequency Within 1m The Cursor Points To The Frequency Range: The Value Is Centered On The Positive And Negative Range Of The Central Frequency, For Example: 0128000 Is The Center Of Plus Or Minus 12.8