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This is likely due to impedance steps in the TG and SA. Although our systems are 50 ohms nominal, the SWR is not great in spots. This can be largely mitigated with a 6 dB fixed SMA attenuator on the TG and SA. Their attenuation will calibrate out, and should make any discontinuities all but disappear as your return loss will improve by 12 dB.
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