diff --git a/beacon.lua b/beacon.lua
index 623cfe0..2ff8fcc 100644
--- a/beacon.lua
+++ b/beacon.lua
@@ -1,12 +1,12 @@
 minetest.register_node("ham_radio:beacon", {
   description = "Radio Beacon",
   tiles = {
-	  "ham_radio_transmitter_top.png",
-	  "ham_radio_transmitter_top.png",
-	  "ham_radio_transmitter_side.png",
-	  "ham_radio_transmitter_side.png",
-	  "ham_radio_transmitter_side.png",
-	  "ham_radio_beacon_front.png"
+    "ham_radio_transmitter_top.png",
+    "ham_radio_transmitter_top.png",
+    "ham_radio_transmitter_side.png",
+    "ham_radio_transmitter_side.png",
+    "ham_radio_transmitter_side.png",
+    "ham_radio_beacon_front.png"
   },
   groups = {cracky=2,oddly_breakable_by_hand=2},
   sounds = default.node_sound_metal_defaults(),
@@ -23,7 +23,7 @@ minetest.register_node("ham_radio:beacon", {
     if minetest.is_player(placer) then
       local name = placer:get_player_name()
       meta:set_string('operated_by', name)
-      ham_radio.play_tuning_sound(placer)        
+      ham_radio.play_tuning_sound(placer)
     end
     meta:set_string("frequency", ham_radio.find_free_frequency(ham_radio.settings.beacon_frequency))
     ham_radio.transmitter_update_infotext(meta)
diff --git a/rds.lua b/rds.lua
index f96e7ae..42e3270 100644
--- a/rds.lua
+++ b/rds.lua
@@ -58,7 +58,7 @@ function ham_radio:update_rds(player)
     minetest.chat_send_player(player:get_player_name(), minetest.colorize(ham_radio.settings.rds_color, message))
 
     -- when all RDS messages are shown, reload them again
-    if not next(ham_radio.player_rds[name]) then    
+    if not next(ham_radio.player_rds[name]) then
       ham_radio.player_rds[name] = ham_radio.get_rds_messages(frequency)
     end
   end
diff --git a/receiver_station.lua b/receiver_station.lua
index b557fdf..8da7b06 100644
--- a/receiver_station.lua
+++ b/receiver_station.lua
@@ -10,12 +10,12 @@ end
 minetest.register_node("ham_radio:receiver", {
   description = "Ham Radio Receiver",
   tiles = {
-	  "ham_radio_receiver_top.png",
-	  "ham_radio_receiver_top.png",
-	  "ham_radio_receiver_side.png",
-	  "ham_radio_receiver_side.png",
-	  "ham_radio_receiver_side.png",
-	  "ham_radio_receiver_front.png"
+    "ham_radio_receiver_top.png",
+    "ham_radio_receiver_top.png",
+    "ham_radio_receiver_side.png",
+    "ham_radio_receiver_side.png",
+    "ham_radio_receiver_side.png",
+    "ham_radio_receiver_front.png"
   },
   groups = {cracky=2,oddly_breakable_by_hand=2},
   sounds = default.node_sound_metal_defaults(),