About Irwin Police Frequencies
- 2 conventional channels are analog FM, so any scanner can receive them. Enter the frequency and set the tone shown in the table.
- Trunked radio systems that carry law-enforcement traffic here: South Dakota State Radio System: 2 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 Irwin, start with the Iona site of South Dakota State Radio System, about 15 miles away. Its control channels: 156.015, 159.06, 159.285 MHz.
Tripp County channels that also cover Irwin
Dispatch
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Tripp County Sheriff | Winner Police | 155.4300 In 158.9550 | 141.3 PL | FM | WPWG957 |
Tactical
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Tripp County Sheriff | Tripp County Sheriff – Tactical Channel | 151.2575 | FM | WQOL848 |
South Dakota State Radio System
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Tripp County Sheriff | Law 1 | 1078 | 436 | D |
| Tripp County Sheriff | Law 2 | 1076 | 434 | D |
Nearest trunked radio sites
Distances are measured from the center of Irwin.
Iona · South Dakota State Radio System
RFSS 1 · Site 2 (hex 2) · NAC 470 · about 15 mi away
Control 156.015, 159.06, 159.285
Voice 159.69
Winner · South Dakota State Radio System
RFSS 1 · Site 46 (hex 2E) · about 15 mi away
Control 155.565, 156.1125, 157.77
Voice 158.49
Reliance (Medicine Butte) · South Dakota State Radio System
RFSS 1 · Site 58 (hex 3A) · NAC 470 · about 46 mi away
Control 155.655, 156.03
Voice 155.85, 159.165
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.
Common questions
What frequency do the police use in Irwin?
We do not have a dispatch channel listed specifically for Irwin. County-level dispatch channels in the same county: Tripp County Sheriff 155.4300 MHz (141.3 PL).