<div *ngIf="let notice of (news$ | async)"> ...

refreshTImer$ = timer(0, 30000)
news$ =$
this.sub = this.refreshTimer$.subscribe(this.service.refresh$)

loadNews$ = this.http.get('/newsfeed')...
refresh$ = new BeharviorSubject(null);
news$ = this.refresh$.pipe(
 exhaustMap( () => this.loadNews$)
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