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Portland Police Frequencies

We do not have frequencies listed specifically for Portland in Cerro Gordo County, Iowa yet. Countywide channels for Cerro Gordo County that may also cover this area are shown below when we have them. The closest trunked radio site we have is Mason City (Iowa Statewide Interoperable Communications System (ISICS)), about 3 miles away.

About Portland Police Frequencies

  • Trunked radio systems that carry law-enforcement traffic here: Iowa Statewide Interoperable Communications System (ISICS): 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 Portland, start with the Mason City site of Iowa Statewide Interoperable Communications System (ISICS), about 3 miles away. Its control channels: 769.90625, 770.15625, 770.40625 MHz.

Cerro Gordo County channels that also cover Portland

Iowa Statewide Interoperable Communications System (ISICS)

AgencyDescriptionTalkgroupHexMode
Cerro Gordo County SheriffLaw 1A216015461T
Cerro Gordo County SheriffLaw Info216025462T
Cerro Gordo County SheriffLaw 1C216035463T

Nearest trunked radio sites

Distances are measured from the center of Portland.

Mason City · Iowa Statewide Interoperable Communications System (ISICS)
RFSS 1 · Site 65 (hex 41) · NAC 4C4 · about 3 mi away
Control 769.90625, 770.15625, 770.40625
Voice 769.65625
Floyd Co Simulcast · Iowa Statewide Interoperable Communications System (ISICS)
RFSS 2 · Site 34 (hex 22) · about 18 mi away
Control 774.33125
Voice 773.58125, 773.83125
Joice · Iowa Statewide Interoperable Communications System (ISICS)
RFSS 2 · Site 98 (hex 62) · NAC 4C2 · about 22 mi away
Control 770.94375, 774.56875, 774.81875
Voice 770.69375
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.