The U.S. Capitol Police protect the U.S. Capitol grounds and the area around it, as well as members of Congress and their staff.
Their primary communications system is currently a P-25 Phase 1 trunked system, with all talk groups encrypted full-time. Here are the system specs:
System ID 582
WACN BEE00
SITE NAC N580
System Frequencies
169.5750
169.8375
170.1375
170.3750
170.5750
171.0000
171.4125
171.7875
172.3875
172.6875
172.9625
173.1625
173.4750
U.S. Capitol Police VHF Allocations
162.2500 – Travel Channel
162.6125 – Travel Channel
162.8000
163.1000 – Travel Channel
163.1625
163.6000
164.0125
164.3250
164.6000 – Travel Channel
164.6125
164.6250 – Travel Channel
164.8000 – Travel Channel
164.8125
165.0375
165.5375 – Travel Channel
165.7750
166.2250
166.4250
166.4500 – Travel Channel
166.4750 – Travel Channel
168.3500 – Travel Channel
169.2250 – Travel Channel
169.5750
169.8375
170.1375
170.1750 – Travel Channel
170.3750
170.5750
171.0000
171.4125
171.7875
172.3875
172.6875
172.9625
173.1625
173.4750
173.5250 – Travel Channel
173.8125
173.8750 – Travel Channel
The frequencies in the above list labeled as “Travel Channel” do not refer to the cable TV network, but indicate these frequencies are allocated for use outside the Washington, DC area. When working outside DC, keep these in your radio and see if anything pops up. The frequency of 173.5250 MHz, using a NAC of N1C3 was heard recently during one of the Republican debate events, so they might be in use in other areas as well.
173.8750, N1D3 – This frequency and P-25 NAC has be heard at multiple Super Bowls in past years. At one time I assumed it to be used by the Environmental Protection Agency (EPA), but the frequency is also used by the U.S. Capitol Police, and can be used when they travel with a member of Congress, whom they protect. I can’t definitely confirm who was using it in this case.
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