Do devices plugged into an unmanaged switch need to be on the same net?

I have two USRP radios plugged into an unmanaged switch. Their IP addresses are 192.168.10.2 and 192.168.20.2 . If I connect these to the unmanaged switch and connect the switch to an ethernet port on a crystal workstation, do I need to reconfigure the ip addresses of the radios? If I do, how should I set them up?

If you want to keep the radios on separate subnets, you can add a second IP address to the workstation on the 192.168.20.x net and be able to talk to both. If they don't mind being on the same subnet, then you can change the radio IP.

For devices on different networks to communicate, you need a router. So in this case, your workstation will not be able to communicate with one of your radios.

The simplest solution is to put all your devices on the same subnet, 192.168.10.0/24.