Remove --oversample dump1090 flag. Add --modeac (mutually exclusive options).

#703

main/sdr.go

@@ -55,7 +55,7 @@ type Dump1090TermMessage struct {
 func (e *ES) read() {
 	defer e.wg.Done()
 	log.Println("Entered ES read() ...")
-	cmd := exec.Command("/usr/bin/dump1090", "--oversample", "--net", "--device-index", strconv.Itoa(e.indexID), "--ppm", strconv.Itoa(e.ppm))
+	cmd := exec.Command("/usr/bin/dump1090", "--modeac", "--net", "--device-index", strconv.Itoa(e.indexID), "--ppm", strconv.Itoa(e.ppm))
 	stdout, _ := cmd.StdoutPipe()
 	stderr, _ := cmd.StderrPipe()