About Shell Rock Police Frequencies
- Trunked radio systems that carry law-enforcement traffic here: Allied Radio Matrix for Emergency Response (ARMER): 9 talkgroups. A trunking scanner is required, and it must support the system type shown.
- To follow a trunked system, program a control channel first. For Shell Rock, start with the Glenville site of Allied Radio Matrix for Emergency Response (ARMER), about 1 miles away. Its control channels: 851.4625, 852.0375, 852.225 MHz.
- 1 listed entry is marked encrypted. No scanner can decode encrypted audio.
Freeborn County channels that also cover Shell Rock
Allied Radio Matrix for Emergency Response (ARMER)
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Freeborn County Sheriff | Freeborn Law Dispatch | 21843 | 5553 | D |
| Freeborn County Sheriff | Freeborn Law Dispatch | 21845 | 5555 | D |
| Freeborn County Sheriff | Freeborn Law Dispatch | 21846 | 5556 | D |
| Freeborn County Sheriff | Freeborn Law Operations | 21847 | 5557 | D |
| Freeborn County Sheriff | Freeborn Law Operations | 21848 | 5558 | D |
| Freeborn County Sheriff | Freeborn Law Operations | 21849 | 5559 | D |
| Freeborn County Sheriff | Freeborn Law Operations | 21850 | 555a | D |
| Freeborn County Sheriff | County Jail | 21856 | 5560 | D |
1 encrypted talkgroup (cannot be monitored)
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Freeborn County Sheriff | Freeborn Law Dispatch | 21844 | 5554 | D Encrypted |
Nearest trunked radio sites
Distances are measured from the center of Shell Rock.
Glenville · Allied Radio Matrix for Emergency Response (ARMER)
RFSS 3 · Site 34 (hex 22) · about 1 mi away
Control 851.4625, 852.0375, 852.225
Voice 851.7875, 852.5375, 852.7375
Austin · Allied Radio Matrix for Emergency Response (ARMER)
RFSS 3 · Site 12 (hex C) · about 10 mi away
Control 859.7625
Voice 852.2625, 860.2375, 860.4375, 860.7125, 860.9625
Albert Lea · Allied Radio Matrix for Emergency Response (ARMER)
RFSS 3 · Site 33 (hex 21) · about 11 mi away
Control 851.1375
Voice 851.3875, 851.5625, 851.8125, 853.7875, 856.4625
What do these numbers mean?
- Control channel
- The frequency your scanner listens to first. It tells the scanner where each voice call is happening, so program it before anything else.
- Voice
- The other frequencies the site uses for calls. A trunking scanner follows them automatically once it has the control channel.
- Site
- One tower location of the system. Scanners show the number in decimal or hex, so both are listed.
- RFSS (Radio Frequency Sub-System)
- A group of sites run by the same controller. Large Project 25 systems can have several.
- NAC (Network Access Code)
- A hex code the site transmits. Your scanner can use it to ignore other systems on the same frequency.
- Talkgroup
- A virtual channel on a trunked system, such as one agency’s dispatch. Programming uses the decimal or hex number, depending on your scanner.