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Madison Police Frequencies

We do not have frequencies listed specifically for Madison in Grant County, South Dakota yet. Countywide channels for Grant County that may also cover this area are shown below when we have them. The closest trunked radio site we have is Watertown (South Dakota State Radio System), about 26 miles away.

About Madison Police Frequencies

  • Trunked radio systems that carry law-enforcement traffic here: South Dakota State Radio System: 3 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 Madison, start with the Watertown site of South Dakota State Radio System, about 26 miles away. Its control channels: 157.89, 158.67 MHz.

Grant County channels that also cover Madison

South Dakota State Radio System

AgencyDescriptionTalkgroupHexMode
Grant County SheriffLaw 1108743fD
Grant County SheriffGrant County Sheriff – Dispatch1089441D
Grant County SheriffSheriff Car/Car1090442D

Nearest trunked radio sites

Distances are measured from the center of Madison.

Watertown · South Dakota State Radio System
RFSS 1 · Site 41 (hex 29) · NAC 477 · about 26 mi away
Control 157.89, 158.67
Voice 158.01, 158.52
Summit · South Dakota State Radio System
RFSS 1 · Site 13 (hex D) · NAC 47D · about 27 mi away
Control 156.015, 158.64, 159.165, 160.05
Voice 157.3125, 160.515
Toronto · South Dakota State Radio System
RFSS 1 · Site 34 (hex 22) · NAC 47F · about 35 mi away
Control 157.5, 157.845, 159.975
Voice 155.685, 160.335
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.