diff --git a/chirp/drivers/idrp.py b/chirp/drivers/idrp.py
index 1c0241724..74ec78b0c 100644
--- a/chirp/drivers/idrp.py
+++ b/chirp/drivers/idrp.py
@@ -81,7 +81,7 @@ def set_freq(pipe, freq):
     resp = send(pipe, buf)
     for frame in resp:
         if len(frame) == 6:
-            if frame[4] == b"\xfb":
+            if frame[4] == 251:
                 return True
 
     raise errors.InvalidDataError("Repeater reported error")
@@ -96,14 +96,14 @@ def get_freq(pipe):
     resp = send(pipe, buf)
 
     for frame in resp:
-        if frame[4] == b"\x03":
+        if frame[4] == 3:
             els = frame[5:10]
 
-            freq = int("%02x%02x%02x%02x%02x" % (ord(els[4]),
-                                                 ord(els[3]),
-                                                 ord(els[2]),
-                                                 ord(els[1]),
-                                                 ord(els[0])))
+            freq = int("%02x%02x%02x%02x%02x" % (els[4],
+                                                 els[3],
+                                                 els[2],
+                                                 els[1],
+                                                 els[0]))
             LOG.debug("Freq: %f" % freq)
             return freq
         else:
diff --git a/chirp/util.py b/chirp/util.py
index 392c05f28..3ea55051b 100644
--- a/chirp/util.py
+++ b/chirp/util.py
@@ -86,9 +86,9 @@ def bcd_encode(val, bigendian=True, width=None):
     digits = []
     while val != 0:
         digits.append(val % 10)
-        val /= 10
+        val //= 10
 
-    result = ""
+    result = b""
 
     if len(digits) % 2 != 0:
         digits.append(0)
diff --git a/rpttool b/rpttool
index 7f43c24e6..9e5597a32 100755
--- a/rpttool
+++ b/rpttool
@@ -86,8 +86,8 @@ def _set_freq(rp):
     return True
 
 
-def set_freq():
-    rp = open_device()
+def set_freq(dev):
+    rp = open_device(dev)
     if not rp:
         return