here a sweep 50M to 500M with 10M step, you see those spikes every 10M.
Rigol is not fast enough, but Micsig and Siglent show them clearly.
Center of Grid is around 225M, so you get an idea of BW and Freq.
Micsig goes down very fast, Siglent is the best of all
and Rigol has a linear degree, like a triangle.
Rigols 5ms are too short for the entire sweep (or user error?),
but I tried to make it comparable.
Sweep was done with RF-Explorer-SigGen,
yes, maybe it is a toy but better than nothing...
Micsig TO1104
https://ibb.co/hTupS6Rigol 1074Z hack
https://ibb.co/mf2b76Siglent 1202XE
https://ibb.co/cMZCfRedit: have not found out, how to post pictures with iPad, sorry