About Three Rivers Police Frequencies
- 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 Three Rivers, start with the Redfield site of South Dakota State Radio System, about 4 miles away. Its control channels: 155.415 MHz.
Spink County channels that also cover Three Rivers
South Dakota State Radio System
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Spink County Sheriff | Law 1 | 1183 | 49f | D |
| Spink County Sheriff | Law 2 | 1184 | 4a0 | D |
Nearest trunked radio sites
Distances are measured from the center of Three Rivers.
Redfield · South Dakota State Radio System
RFSS 1 · Site 60 (hex 3C) · about 4 mi away
Control 155.415
Voice 156.12, 159.69
Orient Hills · South Dakota State Radio System
RFSS 1 · Site 47 (hex 2F) · about 27 mi away
Control 158.49, 158.64
Voice 157.83, 157.95
Aberdeen · South Dakota State Radio System
RFSS 1 · Site 1 (hex 1) · about 36 mi away
Control 156.15, 157.275, 159.375
Voice 159.225
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.