About Grisham Police Frequencies
- 6 conventional channels are analog FM, so any scanner can receive them. Enter the frequency and set the tone shown in the table.
- 3 conventional channels use a digital mode (P25, NXDN48), which needs a scanner that decodes those modes.
- 3 listed entries are marked encrypted. No scanner can decode encrypted audio.
Montgomery County channels that also cover Grisham
Dispatch
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Montgomery County Sheriff | Montgomery County Sheriff – Dispatch (95% ENC) | 151.3250 In 159.2550 | NAC 351 | P25 Encrypted | KNIA485 |
| Montgomery County Sheriff | Mobile Extenders | 154.8900 | FMN | WPIG428 | |
| Montgomery County Sheriff | Mobile Extenders (PL on TX only) | 155.9100 | 173.8 PL | FMN | WPIG428 |
| Montgomery County Sheriff | Mobile Extenders (or Remote Tx at Litchfield) | 173.2550 | 100.0 PL | FMN | — |
Tactical
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Montgomery County Sheriff | Operations | 151.3250 In 159.2550 | NAC 146 | P25 Encrypted | KNIA485 |
| Montgomery County Sheriff | Car-to-Car | 151.3250 | 047 DPL | FMN | KNIA485 |
Jails & Corrections
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Graham Correctional Center (Hillsboro) [K-12] | Operations | 453.1000 In 458.1000 | RAN 12 | NXDN48 Encrypted | KDZ731 |
| Graham Correctional Center (Hillsboro) [K-12] | Operations | 453.3500 In 458.3500 | FMN | KDZ731 | |
| Graham Correctional Center (Hillsboro) [K-12] | Operations | 453.8750 In 458.8750 | 127.3 PL | FMN | KDZ731 |
Nearest trunked radio sites
Distances are measured from the center of Grisham.
Mount Olive · STARCOM21 Statewide Illinois
RFSS 3 · Site 12 (hex C) · NAC 146 · about 10 mi away
Control 770.6875, 774.06875, 774.8125
Voice 769.68125, 769.71875, 773.05625, 855.3875, 855.7375
Greenville · STARCOM21 Statewide Illinois
RFSS 3 · Site 60 (hex 3C) · NAC 144 · about 14 mi away
Control 851.5875, 852.8, 853.25
Voice 851.125, 853.725
Primary · Federal Correctional Institution Greenville
Site 1 (hex 1) · about 15 mi away
Control 407.4125, 408.2125, 408.25, 408.8125, 409.4125
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 Grisham?
We do not have a dispatch channel listed specifically for Grisham. County-level dispatch channels in the same county: Montgomery County Sheriff 151.3250 MHz (NAC 351); Montgomery County Sheriff 154.8900 MHz; Montgomery County Sheriff 155.9100 MHz (173.8 PL); Montgomery County Sheriff 173.2550 MHz (100.0 PL).