Spur (MHz)

The spurious input frequency. This frequency (or some harmonic thereof) will propagate through the design and combine with an LO harmonic of each mixer encountered to produce a spurious in-band signal.

RF (MHz)

The frequency to which the system is currently tuned (see Source Palette) or the tuned frequency causing the worst case spur. This depends on whether Worst Case Frequencies is checked on not (see below). To determine the LO frequencies involved in the calculations, set the input to the frequency listed in this column using the Source Palette.

Level (dBm)

The absolute level of the spurious input necessary to produce the same level at the output as a desired input signal at MDS level.

Margin (dB)

The relative level of the spurious input above MDS. The relative level is a measure of the receiver's ability to discriminate between the minimum detectable input signal and an undesired signal at any other frequency to which it is responsive. This number is normally positive, but may be negative under certain conditions (see Margin Considerations)

Mixer1

The N X M harmonic of Mixer1 contributing to the spur. N and M are the RF and LO harmonics respectively.

Mixer2

The N X M harmonic of Mixer2 (if present) contributing to the spur. N and M are the RF and LO harmonics respectively.

MixerN

The harmonics used in the calculation of the Nth mixer.