About Helvetia Police Frequencies
- 3 conventional channels are analog FM, so any scanner can receive them. Enter the frequency and set the tone shown in the table.
- 1 conventional channel uses a digital mode (P25), which needs a scanner that decodes that mode.
- Trunked radio systems that carry law-enforcement traffic here: STARCOM21 Statewide Illinois: 41 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 Helvetia, start with the Simulcast 2-1 site of Clinton County IL Public Safety, about 14 miles away. Its control channels: 155.13, 155.4375, 155.5575 MHz.
- 19 listed entries are marked encrypted. No scanner can decode encrypted audio.
Madison County channels that also cover Helvetia
Dispatch
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Madison County Sheriff | Sheriff/Courts/Probation | 155.0400 | 100.0 PL | FMN | KCX387 |
Tactical
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Roxana/South Roxana Police | Roxana/South Roxana Police – Tactical Channel / Public Works | 153.8150 In 155.9850 | 225.7 PL | FMN | KA91441 |
Jails & Corrections
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Madison County Sheriff Old | Jail Operations | 155.5950 In 159.2850 | 263 DPL | FMN | KSB221 |
| Madison County Sheriff | Jail (patched with SC21 TG7308) | 854.9625 In 809.9625 | NAC 022 | P25 Encrypted | WRFW617 |
STARCOM21 Statewide Illinois
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Madison Co. Sheriff/Law/Government | Animal Control – Dispatch (Shelter) | 7301 | 1c85 | D |
| Madison Co. Sheriff/Law/Government | Madison Co. Sheriff/Law/Government – Dispatch | 7315 | 1c93 | D |
| Madison Co. Sheriff/Law/Government | Altermate Dispatch / Car-to-Car | 7316 | 1c94 | D |
| Madison Co.-Edwardsville/SIUE | SIUE Police – Dispatch (w/Dental School) | 7951 | 1f0f | D |
| Madison Co. EMA / Interop | Mutual Aid | 7309 | 1c8d | D |
| Madison Co. EMA / Interop | Mutual Aid | 8399 | 20cf | D |
| Madison Co. Sheriff/Law/Government | Car-to-Car/Secondary Dispatch | 7304 | 1c88 | D |
| Madison Co. Sheriff/Law/Government | Alton High School – Officers | 7312 | 1c90 | D |
| Madison Co. Sheriff/Law/Government | Investigations D (w/ Local Law) | 7313 | 1c91 | D |
| Madison Co. Sheriff/Law/Government | Probation Officers/Rural Police (rare use) | 7314 | 1c92 | D |
| Madison Co. Sheriff/Law/Government | Madison Co. Sheriff/Law/Government – Tactical Channel (Events; w/ Dispatcher) | 7320 | 1c98 | D |
| Madison Co. Sheriff/Law/Government | Madison Co. Sheriff/Law/Government – Tactical Channel | 7321 | 1c99 | D |
| Madison Co. Sheriff/Law/Government | Madison Co. Sheriff/Law/Government – Tactical Channel | 7350 | 1cb6 | D |
| Madison Co. Sheriff/Law/Government | Operations (w/ SOS Police) | 7351 | 1cb7 | D |
| Madison Co. Sheriff/Law/Government | Captains/Administrators – (Charles Units) | 7355 | 1cbb | D |
| Madison Co.-Alton, Wood River Dispatch | WR Law – Field Testing 29131 | 29131 | 71cb | D |
| Madison Co.-Alton, Wood River Dispatch | WR Law – Field Testing 29132 | 29132 | 71cc | D |
| Madison Co.-Alton, Wood River Dispatch | WR Law – Field Testing 29133 | 29133 | 71cd | D |
| Madison Co.-Alton, Wood River Dispatch | WR Law – Field Testing 29134 | 29134 | 71ce | D |
| Madison Co.-Alton, Wood River Dispatch | WR Law – Testing 29135 | 29135 | 71cf | D |
| Madison Co.-Alton, Wood River Dispatch | Testing 29145 | 29145 | 71d9 | T |
| Madison Co.-Edwardsville/SIUE | SIUE Police – Car-to-Car | 7952 | 1f10 | D |
| Madison Co.-Edwardsville/SIUE | SIUE Police – Operations | 7954 | 1f12 | D |
18 encrypted talkgroups (cannot be monitored)
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Madison Co. Sheriff/Law/Government | Car-to-Car | 7317 | 1c95 | D Encrypted |
| Madison Co. Sheriff/Law/Government | Investigations E | 7318 | 1c96 | D Encrypted |
| Madison Co. Sheriff/Law/Government | Investigations F | 7319 | 1c97 | D Encrypted |
| Madison Co. Sheriff/Law/Government | Investigations G | 7322 | 1c9a | D Encrypted |
| Madison Co. Sheriff/Law/Government | Investigations H | 7324 | 1c9c | D Encrypted |
| Madison Co. Sheriff/Law/Government | County Law – Operations | 7376 | 1cd0 | D Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29141 | 29141 | 71d5 | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29142 | 29142 | 71d6 | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29143 | 29143 | 71d7 | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29144 | 29144 | 71d8 | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29146 | 29146 | 71da | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29147 | 29147 | 71db | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29148 | 29148 | 71dc | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29149 | 29149 | 71dd | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29153 | 29153 | 71e1 | T Encrypted |
| Madison Co.-Alton, Wood River Dispatch | Testing 29154 | 29154 | 71e2 | T Encrypted |
| Madison Co.-Edwardsville/SIUE | SIUE Police – Operations | 7953 | 1f11 | D Encrypted |
| Madison Co. Sheriff/Law/Government | Court-Bailiffs (Multicast 800R ENC) | 7308 | 1c8c | D Encrypted |
Nearest trunked radio sites
Distances are measured from the center of Helvetia.
Simulcast 2-1 · Clinton County IL Public Safety
RFSS 2 · Site 1 (hex 1) · NAC B63 · about 14 mi away
Control 155.13, 155.4375, 155.5575, 155.6775, 155.805
Voice 155.3175, 155.9475
Primary · Federal Correctional Institution Greenville
Site 1 (hex 1) · about 17 mi away
Control 407.4125, 408.2125, 408.25, 408.8125, 409.4125
Madison Co Simulcast · STARCOM21 Statewide Illinois
RFSS 3 · Site 1 (hex 1) · NAC 140 · about 18 mi away
Control 851.875, 852.1375, 852.3
Voice 851.35, 852.5375, 853.0875, 853.275, 853.6625
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 Helvetia?
We do not have a dispatch channel listed specifically for Helvetia. County-level dispatch channels in the same county: Madison County Sheriff 155.0400 MHz (100.0 PL).