Treasury Department Frequencies

Here are the frequencies that have been identified as being allocated to and used by the Treasury Department, so give these a listen and see if some activity shows up:

163.1000

163.1250

163.2125

163.6375

164.1000

164.2500

164.5375

165.1000

165.3375

165.4125

165.4625

165.6500

165.9125

165.9500

166.0000

166.2000

166.4625

166.5375

166.5875

166.9750

167.0000

167.1000

167.1500

167.9750

168.3500

172.6375

173.0250

173.8625

406.4250

406.5500

406.7250

406.8000

406.8750

407.8000

408.4000

408.6500

409.1000

409.1750

409.2000

409.2250

409.2500

409.7750

409.8750

411.1250

411.5250

411.5500

412.2250

414.3250

414.7000

414.7500

414.9000

415.0000

415.1000

415.4250

415.5500

415.6000

415.7250

415.8000

415.8750

416.0500

416.2000

416.3250

416.8000

417.0250

417.6500

417.7250

417.7500

418.0500

418.0750

418.1000

418.1750

418.2000

418.2250

418.2500

418.5750

Most IRS VHF P25 channels appear to be using a Network Access Code (NAC) of N100. There is evidence that the TIGTA (formerly IOG) operations are using a NAC of N1F1. And the primary repeaters for IRS operations may have adopted the system used by other federal agencies of using different NACs to access different repeaters on the same frequency. Here are some confirmed loggings of IRS channels around the country:

163.2125, N100          IRS TAC 1, most likely a nationwide assignment

163.6375, N100          IRS TAC 2, also nationwide

164.5375, N1F1          IRS TIGTA

165.1000, N1F1          IRS TIGTA

165.3375, N1F1          Possible IRS TIGTA TAC channel

165.6500, N1F1

165.9500, N001          IRS NET 1, using various NACs (N001 thru N010)

165.9500, N100          Some areas used as a simplex TAC, or NET 1 repeater out

167.0000, N001          Input to the 165.9500 repeater using various NACs

172.6375, N1F1          Input to the 164.5375 MHz repeater

409.7750                     Philadelphia, PA, now using Motorola TRBO digital

411.5500                     Andover, MA Campus Service Center

414.7000                     Reported in analog in the Birmingham, Alabama area

415.7250                     Reported in analog in the Birmingham, Alabama area

418.1750                     Reported in analog in the Birmingham, Alabama area

418.2000                     Reported in analog in the Birmingham, Alabama area

418.2250                     Reported in analog in the Birmingham, Alabama area