Where can I buy a TCXO DG9KB Jul 10th 2022 Does anybody know the difference between:- TG2520SMN 40.0000M-ECGNNM0and- TG2520SMN 40.0000M-ECGNNM3Version 0 is half price of 3.Also there is no info in the datasheet about the "index"73 de DG9KB