Whislt possibly overkill for what you want (I don't actually understand what it is you want) I will throw an idea in the pot:
sdrsharp with frequency scanner plugin can give a nice activity log (ignore the odd labelling in this, I edited out some text):
8:54:39 AM ; 239.225 MHz ; ; 5.5 secs |
8:54:45 AM ; 240.000 MHz ; ; 1.4 secs |
8:54:47 AM ; 242.675 MHz ; Airband - Military - ; 1.6 secs |
8:54:48 AM ; 244.600 MHz ; ; 0.7 secs |
8:54:50 AM ; 246.900 MHz ; ; 0.7 secs |
8:54:50 AM ; 250.000 MHz ; ; 0.8 secs |
8:54:51 AM ; 251.225 MHz ; ; 9.8 secs |
8:55:05 AM ; 343.700 MHz ; ; 1.2 secs |
8:55:09 AM ; 382.450 MHz ; ; 1.2 secs |
8:55:47 AM ; 269.475 MHz ; Airband - Military - ; 48.6 secs |
9:00:01 AM ; 290.975 MHz ; Airband - Military - ; 0.9 secs |
9:00:25 AM ; 290.975 MHz ; Airband - Military - ; 2.4 secs |
9:00:35 AM ; 377.900 MHz ; Airband - Military - ; 3.9 secs |
9:01:24 AM ; 377.900 MHz ; Airband - Military - ; 3.3 secs |
9:01:41 AM ; 377.900 MHz ; Airband - Military - ; 2.4 secs |
9:02:18 AM ; 377.900 MHz ; Airband - Military - ; 1.8 secs |
9:02:26 AM ; 377.900 MHz ; Airband - Military - ; 4.7 secs |
9:04:08 AM ; 377.900 MHz ; Airband - Military - ; 0.7 secs |
9:07:26 AM ; 233.350 MHz ; ; 2.1 secs |
9:08:55 AM ; 285.575 MHz ; ; 0.6 secs |
9:09:05 AM ; 297.575 MHz ; ; 5.1 secs |
9:13:46 AM ; 316.400 MHz ; ; 0.6 secs |
9:14:22 AM ; 377.900 MHz ; Airband - Military - ; 6.1 secs |
9:15:34 AM ; 377.900 MHz ; Airband - Military - ; 9.9 secs |
9:16:52 AM ; 377.900 MHz ; Airband - Military - ; 2.3 secs |
9:17:03 AM ; 269.475 MHz ; Airband - Military - ; 1.4 secs |
9:17:24 AM ; 377.900 MHz ; Airband - Military - ; 1.1 secs |
9:20:34 AM ; 346.550 MHz ; ; 3.2 secs |
9:22:43 AM ; 233.350 MHz ; ; 1.1 secs |
9:23:24 AM ; 256.025 MHz ; ; 0.7 secs |
So you have the time, freq and duration in a csv output. If you do happen to be using a recorder plugin you can have it record the audio traffic.
Someone says there was some abusive language last friday at 05:32 you can quickly and easily find out IF the repeater was active and pull up the audio to check. Easy to do analysis of when the repeater is most used and all sorts of other fun math (one of the only occasions that American seems more sensible than English - where it would be 'maths')
Whilst doing this it also creates a session log of hits on each active frequency.
I realise you are talking about a single frequency but you could set the scan to two frequencies - the one you want and one that is easily squelched out and that way you'll only ever see the stuff you wanted.