I took a listen to the audio file and what you're hearing is an MDC1200 status indicator from a Motorola radio. You typically hear these on police frequencies but since they're easily modifiable to the ham bands you'll hear them with the encoder still enabled on ham radio, too. I took the audio file and decoded it with WinMDCD (freeware) and it reveals nothing too interesting:
TIME OP ARG ID DESCRIPTION ----------------------------------------------------- 00:00:05.5 01 00 0424 POST UNIT ID 00:00:06.4 01 00 0424 POST UNIT ID 00:00:09.7 01 00 A900 POST UNIT ID 00:00:24.0 01 00 A900 POST UNIT ID 00:00:46.4 01 00 A900 POST UNIT ID
00:00:11.3 NO DECODE 00:00:20.8 NO DECODE
I edited the time stamps to reflect the time shown in the audacity sound file.
73, Mark