apps/trx/radio_if.py: drop unused imports
diff --git a/apps/trx/radio_if.py b/apps/trx/radio_if.py
index 41eb3e8..9029f85 100644
--- a/apps/trx/radio_if.py
+++ b/apps/trx/radio_if.py
@@ -29,9 +29,6 @@
 
 from math import pi
 
-from gnuradio.eng_option import eng_option
-from gnuradio import eng_notation
-from gnuradio.filter import firdes
 from gnuradio import blocks
 from gnuradio import gr