AFSK: reduce default prefix to 200ms, tnx PE1RJV

res/xml/backend_afsk.xml

@@ -32,8 +32,8 @@
         <de.duenndns.EditTextPreferenceWithValue
                 android:key="afsk.prefix"
 		android:inputType="number"
-		android:defaultValue="1000"
-		android:hint="1000"
+		android:defaultValue="200"
+		android:hint="200"
 		android:title="@string/p_afsk_prefix"
 		android:summary="@string/p_afsk_prefix_summary"
 		android:dialogTitle="@string/p_afsk_prefix_entry" />

src/backend/AfskUploader.scala

@@ -14,7 +14,7 @@ class AfskUploader(service : AprsService, prefs : PrefsWrapper) extends AprsBack
 		with PacketHandler with PacketCallback {
 	val TAG = "APRSdroid.Afsk"
 	// frame prefix: bytes = milliseconds * baudrate / 8 / 1000
-	var FrameLength = prefs.getStringInt("afsk.prefix", 1000)*1200/8/1000
+	var FrameLength = prefs.getStringInt("afsk.prefix", 200)*1200/8/1000
 	var Digis = prefs.getString("digi_path", "WIDE1-1")
 	val use_hq = prefs.getAfskHQ()
 	val use_bt = prefs.getAfskBluetooth()