About Green Mountain Police Frequencies
- 1 conventional channel is analog FM, so any scanner can receive it. Enter the frequency and set the tone shown in the table.
Marshall County channels that also cover Green Mountain
Jails & Corrections
| Agency | Description | Frequency (MHz) | Tone | Mode | FCC |
|---|---|---|---|---|---|
| Marshall County Jail | Jail | 155.3100 | 203.5 PL | FMN | KAA985 |
Nearest trunked radio sites
Distances are measured from the center of Green Mountain.
Marshalltown · Iowa Statewide Interoperable Communications System (ISICS)
RFSS 1 · Site 64 (hex 40) · NAC 4C1 · about 9 mi away
Control 773.83125, 774.08125, 774.33125
Voice 773.08125, 773.33125, 773.58125
Tama · Iowa Statewide Interoperable Communications System (ISICS)
RFSS 1 · Site 38 (hex 26) · NAC 4C0 · about 17 mi away
Control 770.21875, 770.46875, 770.96875
Voice 770.71875
Newton Correctional Facility · Iowa Department of Corrections
Site 999 (hex 3E7) · about 31 mi away
Voice 453.375, 453.55, 460.05, 460.125
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.