I believe what you are hearing is the station alerting talkgroups that are patched to the primary DelComm channel. If Medic 7 is being dispatched, you will hear it on DelComm primary, along with TG10013 (station 7 alerting). This way the station can set their base radio to only receive a dispatch if it is their call vs listening to the entire county being dispatched all day long. This began back when Del Co went to their 800 system. I posted about this back on Sept 4, 2015, and submitted them for the RR database, but I don't think they were ever loaded.
I have been searching COIRS for some new talkgroups and matching them up with the radio template on their website (coirs.org) and I have come across two new talkgroups. The first one is 20031, I am getting a lot of hits tonight but cannot hear anything which makes me think it is encrypted and...
forums.radioreference.com
TG 10013 is the station PA for Medic 7, at least it was a few years ago.
I believe Prev1 became DFD Station 303 alerting.
Here is what I know of (I'm sure there are some new ones, but I haven't checked in a few years) Hope this helps!
| Talkgroup ID | Station |
|---|
| 10226 | 1 Alerting |
| 10227 | 2 Alerting |
| 10228 | 3 Alerting |
| 10229 | 4 Alerting |
| 10230 | 5 Alerting |
| 10231 | 6 Alerting |
| 10013 | 7 Alerting |
| 10233 | 8 Alerting |
| 10234 | 9 Alerting |
| 10235 | 10 Alerting |
| 10047 | 11 Alerting |
| 10052 | 461 Alerting |
| 10053 | 462 Alerting |
| 10241 | 301 Alerting |
| 10242 | 302 Alerting |
| 10061 | 303 Alerting |
| 10062 | 304 Alerting |
| 10236 | 321 Alerting |
| 10237 | 322 Alerting |
| 10054 | 331 Alerting |
| 10238 | 341 Alerting |
| 10257 | 351 Alerting |
| 10239 | 361 Alerting |
| 10240 | 362 Alerting |
| 10232 | 441 Alerting |
| 10258 | 451 Alerting |