About Rock Grove Police Frequencies
- 8 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: STARCOM21 Statewide Illinois: 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 Rock Grove, start with the Freeport site of STARCOM21 Statewide Illinois, about 15 miles away. Its control channels: 851.5875 MHz.
Stephenson County channels that also cover Rock Grove
Dispatch
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Stephenson County Sheriff | Dispatch Backup | 154.8750 In 156.0300 | 131.8 PL | FMN | KSA467 |
Tactical
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Stephenson County Sheriff | Reserves | 154.7400 In 158.8800 | 82.5 PL | FMN | WQKU260 |
| Stephenson County Sheriff | ERT | 158.9100 In 154.7100 | 94.8 PL | FMN | NONE |
| Stephenson County Sheriff | Courthouse Bailiff | 158.9100 | 94.8 PL | FMN | NONE |
Talk-around & Car-to-Car
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Stephenson County Sheriff | Sheriff Vehicular Repeater VHF | 154.7100 | 156.7 PL | FMN | KSA467 |
| Stephenson County Sheriff Unconfirmed | Reserve – Old | 155.9250 In 159.2850 | 131.8 PL | FMN | WNGA345 |
| Stephenson County Sheriff | Sheriff Vehicular Repeater | 770.8938 In 800.9938 | FMN | WQLP920 |
Jails & Corrections
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Stephenson County Sheriff | Jail | 155.6400 In 153.8150 | 131.8 PL | FMN | WPPC862 |
STARCOM21 Statewide Illinois
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Stephenson County Sheriff | Stephenson County Sheriff – Dispatch (Channel 1) | 1651 | 673 | D |
| Stephenson County Sheriff | Stephenson County Sheriff – Dispatch (Channel 2) | 1652 | 674 | D |
| Stephenson County Sheriff | Jail (Simulcast of 155.64 Jail Repeater?) | 1659 | 67b | D |
Nearest trunked radio sites
Distances are measured from the center of Rock Grove.
Freeport · STARCOM21 Statewide Illinois
RFSS 1 · Site 12 (hex C) · NAC 142 · about 15 mi away
Control 851.5875
Voice 851.0875, 852.125, 853.075, 853.725
Pecatonica · STARCOM21 Statewide Illinois
RFSS 1 · Site 35 (hex 23) · NAC 146 · about 15 mi away
Control 851.1625, 852.4625, 853.0625
Voice 851.4625
Lena · STARCOM21 Statewide Illinois
RFSS 1 · Site 21 (hex 15) · NAC 145 · about 17 mi away
Control 852.8875
Voice 852.3625, 853.4125, 853.4375
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 Rock Grove?
We do not have a dispatch channel listed specifically for Rock Grove. County-level dispatch channels in the same county: Stephenson County Sheriff 154.8750 MHz (131.8 PL).