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Interesting Radio Frequencies Past and Present

Tamara Wilhite is a technical writer, industrial engineer, mother of two, and published sci-fi and horror author.

You do not need an amateur radio license to listen in to any of these frequencies, though you need a ham radio license to use some of them.

You do not need an amateur radio license to listen in to any of these frequencies, though you need a ham radio license to use some of them.

There is only one radio frequency spectrum, which means almost all frequency ranges are allocated to someone by the Federal Communications Commission (FCC). This means that the frequency's intended or authorized user is almost always known.

Some of the frequencies in this list are only used in one jurisdiction, while others are world wide. Some of these radio frequencies are historical since the Central Intelligence Agency used the listed below in the 1990s but likely uses others for field operations today.

Note: Those that say nationwide are referring to the United States.

Here is a list of interesting and unusual radio frequencies, past and present. This is, however, only a partial list.

Interesting Frequency Table

FrequencyService and RemarksLocationEMS Call

0.000

Geologic Resonant Frequency

Planet Earth

n/a

0.1143

Cave Radio ASS System

Worldwide

SSB

3.281

Lighter-Than-Aircraft

Worldwide

AM

3.818

EME Meteor Scatter

United States

LSB

3.990

ARRL Voice Bulletin

Newington, CT

CW

4.340

International Chess Players Frequency, also 2100 Hz

Worldwide

USB

5.500

Theta Brain Waves

All Humans

CW

5.688

US Air Force Global Command Net

Worldwide

USB

7.213

Jack In the Box Fraternity

Nationwide (US)

LSB

9.070

US CIA Field Operations

North America

USB

12.0225

US CIA Coded Broadcasts

Worldwide

USB

14.328

Amateur Net Elks 1800z Monday-Friday

Nationwide

USB

14.345

Amateur EME / Moonbounce

Worldwide

USB

21.350

Net Pitcairn of Pitcairn Island

South Pacific

USB

21.440

Baptist Amateur Radio

Worldwide

USB

27.035

Survivalist's AM Channel

Nationwide

FM

27.065

9 AM Highway Safety Channel

Nationwide

AM

27.115

CB Channel 13 Marine Channel

Nationwide

AM

27.125

CB Channel 14 Young People's Channel

Nationwide

AM

34.830

United States Parks and Wildlife Department

Nationwide

FM

36.330

United States Army Nuclear Test Site

Nevada, US

FM

53.500

Radio Control Models

Nationwide

FM

121.5

Emergency Aviation Frequency

Nationwide

AM

121.975

Private Air Craft Flight Service

Nationwide

AM

123.400

United States Army Golden Knights

Airshows in US

AM

143.000

United States Navy Blue Angels

Airshows in US

FM

143.625

Russian Space Station Mir's Voice Communications

Worldwide

FM

146.550

Survivalist Ham 55 Band

Nationwide

VHF

155.505

Survivalist's FM Channel

Nationswide

FM

155.160

Search and Rescue Land (SAR) VHF Band

Nationwide

FM

161.640

Goodyear Airship Ground Operations

Nationwide

FM

163.4375

Environmental Protection Agency

Nationwide

FM

166.700

United States Treasury Secret Service

Whitehouse, Washington, DC

FM

252.80

SAR Rescue Training

Nationwide

FM

372.200

NASA Channel 18 US Air Force SAC

Nationwide

FM

427.250

ATV Simplex

Nationwide

ATV

432.07

Weak Signal CW (Morse Code)

Worldwide

CW

435.00

Satellite Only Communications

International

n/a

462.6125

Family Radio Service Channel 3, Prepper Channel

Nationwide

FM

464.500

National Association of Stock Car Auto Racing (NASCAR)

Nationwide

FM

1800 kHz

160 Meter Ham Band

Worldwide

CW

3.5 MHz

80 Meter Ham Band

Worldwide

RTTY/Data DX

Term or AbbreviationDefinition

CW

Continuous Wave or Morse Code

ATV

Amateur Radio Television

AM

Amplitude Modulation, signals sent by changing the amplitude of the carrier wave

FM

Frequency Modulation, signals sent by changing the frequency of the carrier wave

Legal Disclaimers

It is legal to listen to communications on these frequencies. However, it is illegal to divulge information learned from electronic and radio broadcasts. Furthermore, it is illegal to use these radio frequencies for personal or financial gain.

It is also illegal to interfere with government and commercial operations that have licensed any of the frequencies listed above.

Organizations like the federal government can and may scramble their communications, but this is not allowed on ham radio or CB frequencies.

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

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