Martin555 recently posted a great article about modifying a servo to make a radar motor drive. Martin prefers to use a full size servo to make his drive and so, for you who likewise choose to use a full size servo, I present a ready made alternative. First a disclaimer: I am in no way connected or affiliated with the company I am about to introduce. I use them on my models for turret drives and other similar uses.
GoBilda, www.gobilda.com, makes four similar dual mode servos. They are able to give 180 proportional degrees of rotation out of the box and 300 degrees with a servo extended connected to them. This is how I use them for my turrets, ect. They are ALSO capable of 360 degree continuous rotation, under variable speed control, as well as rotation direction, ie, bi-directional, directly from a proportional channel on a transmitter. They essensially act as fully proprtional, bi-directional motors. They can also be drivern, without a receiver, by a servo driver, with the same attributes. They cost about the same as most decent servos. They will require the programmer which cost about $15 US.Here is a link:
https://www.gobilda.com/standard-size-servos/