.

software/ors-amarisoft/ru/common-input-schema.json

 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
 
+  "$defs": {
+    "ru-common": {
       "required": [
         "ru_type",
         "ru_link_type",
@@ -30,4 +32,6 @@
           "type": "integer"
         }
       }
+    }
+  }
 }

software/ors-amarisoft/ru/sdr/input-schema.json

@@ -4,7 +4,7 @@
   "title": "SDR transiever",
   "description": "Radio Unit constituted of several SDR boards",
   "type": "object",
-  "$ref": "../common-input-schema.json",
+  "$ref": "../common-input-schema.json#/$defs/ru-common",
 
   "required": [
     "sdr_dev_list"