On February 18, 2021 I used my SDR# (Software Defined Radio) software to pick up the Perseverance orbiter radio beacon signal when the Perseverance lander was landing on Mars. As a HAM radio operator, I have do have some experience in SDR, as I usually use it to pick up and record NOAA weather satellite signals, decode them, and then generate weather images. Here is the signal as recorded live. http://tek1systems.com/vid/MarsPerseveranceOrbiter/VID20210218_132426.mp4

https://www.facebook.com/groups/BackyardAstronomy/permalink/2562829904014818/

NASA Mars Perseverance probe frequency log Feb 18 2021:

Relay orbiter Freq 437.512.500
Orbiter beacon freq detected on 437.516.100 – blip every 20 sec. (DSB on SDR#)