About Twin Lakes Police Frequencies
- Trunked radio systems that carry law-enforcement traffic here: Iowa Department of Corrections: 23 talkgroups; Iowa Statewide Interoperable Communications System (ISICS): 2 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 Twin Lakes, start with the Calhoun Co Simulcast site of Iowa Statewide Interoperable Communications System (ISICS), about 6 miles away. Its control channels: 769.90625, 770.15625, 770.40625 MHz.
Calhoun County channels that also cover Twin Lakes
Iowa Department of Corrections
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Anamosa State Penitentiary | Operations | 14193 | 3771 | T |
| Anamosa State Penitentiary | Guards | 14202 | 377a | T |
| Anamosa State Penitentiary | Maintenance | 14272 | 37c0 | T |
| Fort Dodge Correctional | Operations | 46970 | b77a | D |
| Fort Dodge Correctional | Operations | 46974 | b77e | D |
| Fort Dodge Correctional | Operations | 47000 | b798 | D |
| Fort Dodge Correctional | Operations | 47040 | b7c0 | D |
| Fort Madison Prison | prison operations | 30577 | 7771 | T |
| Fort Madison Prison | prison operations (food) | 30586 | 777a | T |
| Fort Madison Prison | prison operations | 30588 | 777c | T |
| Fort Madison Prison | prison operations (460.125) | 30596 | 7784 | T |
| Fort Madison Prison | prison operations | 30616 | 7798 | T |
| Fort Madison Prison | prison operations | 30646 | 77b6 | T |
| Fort Madison Prison | prison operations | 30650 | 77ba | T |
| Fort Madison Prison | prison operations | 30656 | 77c0 | T |
| Iowa Medical and Classification Center | Operations 79738 | 79738 | 1377a | T |
| Iowa Medical and Classification Center | Operations 79738 | 79768 | 13798 | T |
| Iowa Medical and Classification Center | Operations 79778 | 79778 | 137a2 | T |
| Iowa Medical and Classification Center | Operations 79808 | 79808 | 137c0 | T |
| Mount Pleasant Prison | Prison Operations | 22394 | 577a | T |
| Newton Correctional Facility | prison operations | 71546 | 1177a | T |
| Newton Correctional Facility | prison operations | 71550 | 1177e | T |
| Newton Correctional Facility | prison operations | 71586 | 117a2 | T |
Iowa Statewide Interoperable Communications System (ISICS)
| Agency | Description | Talkgroup | Hex | Mode |
|---|---|---|---|---|
| Calhoun County Sheriff | Law Dispatch | 20401 | 4fb1 | T |
| Calhoun County Sheriff | Calhoun County Sheriff – Tactical Channel | 20402 | 4fb2 | T |
Nearest trunked radio sites
Distances are measured from the center of Twin Lakes.
Calhoun Co Simulcast · Iowa Statewide Interoperable Communications System (ISICS)
RFSS 2 · Site 13 (hex D) · NAC 4C8 · about 6 mi away
Control 769.90625, 770.15625, 770.40625
Voice 769.65625
North Central Correctional Facility (Unconfirmed LCN) · Iowa Department of Corrections
Site 998 (hex 3E6) · about 6 mi away
Voice 460.0375, 460.2875
Lansboro · Iowa Statewide Interoperable Communications System (ISICS)
RFSS 2 · Site 115 (hex 73) · NAC 4C3 · about 7 mi away
Control 774.06875, 774.31875
Voice 773.56875, 773.81875
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.