When set up as part of Announcements, the Announcement RSS Feed displays all posts from Announcements. These posts can be from an announcement or from external RSS feeds on the Announcement Index Page.
Click the Announcements link in the Course navigation.
Click the Announcements External Feeds and again click the (RSS) Feed button. A new tab will open in your browser.
You can use this link [1] to subscribe to the Announcement feed to receive Announcements via a feed reader.