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N-type connectors and measurement errors on Signal Analyzers (18-26.5 GHz)

Question asked by dichheda Employee on Mar 11, 2012
Our latest family of analyzers are the X-Series signal analyzers. This includes PXA, MXA, EXA, and CXA, in order of performance. The issue of modes in Type-N connectors is only relevant to analyzers ordered with frequency option 526 (26.5 GHz) because those ordered with higher frequency options do not have type-N connectors, and those ordered with lower frequency options do not operate in the frequency range (18 to 26.5 GHz) that can have modes in the Type-N connector. 

Analyzers with frequency option 526 available (PXA, MXA and EXA) will not be subject to modes if they are fitted with a 3.5 mm input connector. This fitting is option C35 in PXA and is also available through special handling in MXA and EXA. 

There are nominally six modes in the frequency range of 18 to 26.5 GHz. For general amplitude accuracy, the effect of these modes with this connector is included within the specifications as part of frequency response.

For IF frequency response (which is relevant to demodulation and FFT response relative to the center frequency) and IF phase linearity, the effect of the modes is not included within the specifications and must be added as an additional error term to error budgets for analysis in the modes frequency region. These modes cause nominally up to −0.35 dB amplitude change, with phase errors of nominally up to ±1.2°.