# channel sounder ![](attachments/channel%20sounder-attachment.png#invert) - Separates [Transmitter](Transmitter.md) and [Rx](receiver.md) unlike the [VNA](Vector%20network%20analyser.md) - Needs a joint clock (rubidium or GPS) - Phase and frequency synchronisation - End-to-end calibration - calibrated antenna elements for directional estimation. [^1] # References [^1]: [V2x wireless channel modeling for connected cars](../../../Spaces/University/Thesis/Support%20notes/V2x%20wireless%20channel%20modeling%20for%20connected%20cars.md)