Army Corps of Engineers Frequencies



http://www.usace.army.mil


The Corps have a number of allocated HF SSB frequencies, shown here (all of these are in Kilohertz):

3345.0
5015.0
5327.5
5400.0
5437.5
6020.0
6785.0
6790.0
7357.0
9122.5
11693.5
12070.0
12122.0
12267.0
16077.0
16326.0
16327.4
16358.0
16377.0
16382.0
20659.0

In addition to their own HF frequencies, USACE is a participant in COTHEN (Customs Over the Horizon Enforcement Network). This HF system is used by a number of federal law enforcement and interdiction agencies, including CBP, Coast Guard, the Drug Enforcement Administration, and others. Over the past decade or so, it has become the “go-to” system for nearly any federal agency using the HF spectrum. Here are the latest active COTHEN frequencies, again, all in Kilohertz and using SSB:

5372.0
5905.5
7527.0
8912.0
10242.0
11494.0
12222.0
13312.0
13907.0
14582.0
15867.0
15962.0
18594.0
20890/0
23214.0
24838.5
25350.0

32.4000
38.6900
38.8900
38.9100
40.5100

142.9500
143.0750
143.9750
148.4250
148.6000
148.6625
148.6750
148.7000
148.7125
148.7250
148.7500
149.8250
148.9250
149.5000
149.6750
149.7125
149.7750
149.8000
149.8625
148.9250
150.1750
150.4375
150.5500
150.5875
150.6000
150.6250
150.6750
150.7250
150.7375
150.7500
150.7625

162.0250
162.0500
162.2250
162.2500
162.2750
162.3500
162.6125
163.0000
163.0250
163.0750
163.1250
163.3250
163.4125
163.4250
163.4375
163.5375
163.5625
163.5875
164.0250
164.0500
164.1000
164.1500
164.1750
164.2000
164.3500
164.5000
164.5250
164.7000
164.7250
164.7750
164.9625
164.9875
165.0125
165.0375
165.0625
165.0875
165.1125
165.1625
165.1875
166.2000
166.2250
166.7500
167.9250
168.0000
168.1250
168.2750
168.3250
169.4750
169.5750
170.2000
170.3750
170.6000
171.3875
171.9625
171.9750
173.4125
173.4375
173.4625
173.4875
173.5375
173.5625
173.5875


406.1500
406.1750
406.3750
406.5375
406.5500
406.6250
406.6875
406.8375
406.9375
407.1500
407.2250
407.2375
407.2500
407.2750
407.2875
407.3000
407.3500
407.4250
407.4500
407.4875
407.5000
407.5250
407.5500
407.5625
407.5750
407.9500
408.0500
408.9750
409.0000
409.1500
412.8375         Simplex
412.9250         Simplex
412.9500         Simplex
413.0000         Simplex
413.0250         Simplex
413.0500         Simplex
413.2250         Simplex
413.2375         Simplex
413.2500         Simplex
413.4750         Simplex
413.5125         Simplex
413.5250         Simplex
413.5500         Simplex
413.5625         Simplex
416.4875
416.5375
416.5750
416.6500
416.6750
416.7125
417.5375
417.6500
417.8375
418.0000

Here are some  confirmed uses by various Army CoE locations:

173.4125, D205 - Bonneville Dam, OR
 
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