Thursday, April 07, 2016

IRS - Heard Them Lately?

At one time, the IRS division of the Treasury Department was fairly active on their federal frequencies. Lately they seemed to have gotten harder to hear. Not much activity has been heard on their frequencies, but I don't think they've changed to different ones. It's just hat unless they have a major surveillance or warrant service going on, they just don't use the radios that often.

But keep an hear on their frequencies anyway, as you never know when they might get busy!


Here are the frequencies that have been identified as being allocated to and used by the Treasury Department, and specifically the IRS:

163.1000
163.1250
164.1000
164.2500
164.5375
165.1000
165.3375
165.4125
165.4625
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
165.9500, N001 thru N010 – IRS NET 1, using various NACs
165.9500, N100 – Some areas used as a simplex TAC, or NET 1 repeater out
167.0000, N001 thru N010 – Input to the 165.9500 repeater using various NACs
172.6375, N1F1 – Input to the 164.5375 MHz repeater







No comments: