RF Mixer Spur Calculator | |n·Fin ± m·FLO| up to n,m=9

Home RF Mixer Spur Calculator

f_spur = | n·RF ± m·LO | , n=0..9, m=0..9

Window 1 Window 2 Window 3 Overlap is inclusive (≥1 Hz)

n	m	±	Order	IF from RF Range 1 (MHz)	IF from RF Range 2 (MHz)	IF from RF Range 3 (MHz)

Mode

RX: input=RF, output=IF · TX swaps labels

LO (MHz)

FLO

n max

m max

Rows

Duplicates are suppressed: if n=0 or m=0, “+” and “−” are identical under |·|. (n,m)=(0,0) excluded.

RF input ranges (MHz)

Range 1 Start

Range 1 Stop

Range 2 Start

Range 2 Stop

Range 3 Start

Range 3 Stop

IF output windows (MHz)

Window 1 Start

Window 1 Stop

Window 2 Start

Window 2 Stop

Window 3 Start

Window 3 Stop

Save JSON stores this setup only; Load JSON restores the values and recalculates the spur table.

Summary

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Highlight triggers if computed output range overlaps any window by ≥1 Hz. Internally everything is in MHz (1 Hz = 1e-6 MHz).