I/Q imbalance error problem for all users?
Is it not the case that a single user selecting I/Q extension and performing "IQ balance" when there is something other than noise in the passband say can cause a serious noise floor measurement error for all users?
I think we've come across a case where in modes where the selected BW includes band center that a misadjusted balance setting can result in an 'invisible' term at DC that would be similar to LO leakage. In this case, does that imbalance not apply to all users and also persist across power cycles?
A receiver that Rob had at KPH appeared to have a very high noise floor in wide BW's that crossed Fcenter that caused him to think there was a HW problem. Upon examination the noise floor and delivered SNR in USB was normal and 20 dB better than in, say, IQ or AM modes where the IF BW crossed center. The anomaly was repaired by performing the IQ balance correctly and that Kiwi appears to now be 'fixed'.
I've never even used this tool before because there was no need but it would seem that this balance correction should only be available to admin and not to any regular user.
Do I understand this wrong?