Radio Shack TRC-512 (21-412) Expanded frequency chart. Channel Frequency 1 49.670 2 (A) 49.830 3 (B) 49.845 4 (E) 49.890 5 (C) 49.860 6 49.930 7 49.770 8 49.990 9 (D) 49.875 10 49.970 Details on modifying the TRC-512 for these extra frequencies can be found within the Files section.