Listening Devices and Bug Frequency Chart

How-to-find-them

This Post will tell you all you need to know about different types of

Listening Devices” and the ways to go about finding them.

With the use of a few tools you will be able to locate the “Bug” and
even listen to what they are listening to.

The Different types of “Bugs”

The Simplest Of the Bugs

This is the acoustic bug, which uses a stethoscope, rubber tube or glass for direct communication with the ear.

As such, this can be performed on a leaky window, structural defect, ventilation structures and more.

Wall Listening Audio Spy Device

Direct Interminable Tapping into a Phone Or Phone Line

The hard-wire bug is powered by the phone itself and only transmits during calls, thus the difficulty in its detection.

Alternative to directly on the phone, it can be placed at the meeting point of the phone line and junction box.

Phone-Bug

The Radio Frequency Bug

Inexpensive, easily detected but difficult to trace its planter, this bug can be placed on any items.
It sends signals wirelessly through the air and someone nearby intercepts and listens to them.

RF-Bug

Infrared/Optical Listening Devices

These function by projection of a laser, or infrared beam, through an opening into the location being bugged.

This beam picks up the audio and transfers it to the sender, who can be even several miles away.

They are thus expensive and easily detectable, but sounds transmitted are very accurate.

bionic-ear

The Ultrasonic Bug

Placed in a room like a radio frequency bug, it however transmits a different type of signal.

Sound undergoes conversion into an audio signal above human hearing range,

intercepted from a close range and reverted to the original audio signal.

As such, it is both expensive and difficult to detect.

Wall_Listening_system

Conducting a Sweep

One of the errors people bugging make is preferring clustering around certain frequencies.

However, the RF spectrum has to be checked in entirety, which is a long process.

Common Transmission Paths

There are many different types of listening devices whether they are available to the public or the police here is a basic guide

on different types of bugs and tips and ways to go about finding them.

And remember these days you cannot trust anyone!

The bug may utilize telephone, AC power circuits, HVAC or cable TV wiring.

Alternatively, spread spectrum technology or even digital modulation may be used.

A search grid, less than 10 by 10 feet is used, with whichever form of variation in the floor of noise being investigated.

Electronic as well as visual techniques are also used in inspection.

Frequencies which are generally above 1GHz, an amplified dual ridged wave-guide or any standard gain low as well as horn noise amplifier can be used for signal collection.

After detection of any form electromagnetic anomaly, the signal type is identified.

Bug-reciever
Be Thorough

Bugs & wamp; listening devices are usually installed in threes.

That is the

1. The fool’s,

2. The novice’s

3. and the real bug.

The first two are easier to locate and are to throw you off, while the third, the actual bug, is most difficult to find.

All electrical outlets, light fixtures, distribution boxes, circuit breakers, transformers and electric meters must thus undergo checking for anomalies.

The surveillance may be far from the recorder or transmitter, hence ensure to check all possible transmission paths.
A well-performed sweep detects bugs from a relatively long distance.

gsmlisteningdevice

Common Trends

When targeting corporate entities, bugs usually used have a transmission frequency of

20MHz – 3GHz

while one more willing to spend can obtain one that operates between

3GHz – 21GHz and above.

Hence, radio frequency as well as signal analysis during inspections needs to cover at least

9 kHz to 21 GHz, with 30 Hz to one that is above a 110 GHz being ideal.

Bellow is a reference to all the frequencies you should be aware of when searching for a bug it will help you identify any threats.

High Threat Frequency Bands

kHz

Type

Device

50 – 750Carrier Current BugsPower, Phone, HVAC lines
MHz
25 – 80Ultra low power devices (micro watt devices)
65 – 130Micro power Part 15 devices (FM broadcast band)
130 – 150Body Wires and Wireless Microphones – Band I
150 – 174Body Wires and Wireless Microphones – Band II
174 – 225Body Wires and Wireless Microphones – Band III
295 – 310Spread Spectrum and Micro powered Bugsmicro watt devices
330 – 440Audio/Video Bugs(398.605, 300.455, and 399.030 MHz are popular)
430 – 550Audio/Video Bugs (433.920 and 418 MHz is popular)
800 – 990Audio/Video Bugs (902-985 MHz ISM band is popular)
GHz
1.10 – 1.95Video and Audio (980 MHz to 1.45 GHz is very popular)
2.00 – 2.75Video and Audio (2.4 to 2.45 GHz is extremely popular)
5.60 – 7.50Video and Audio (5.8 to 6.2 GHz is becoming very popular)
8.10 – 13.00Video and Audio (Popular)
nm
850 – 950Infrared Transmitters
DC – 3 kHzTypical Audio Band
3 – 500 kHzSkin Effect (Non Radiating)
500 kHz – 3MHzNon Radiating, Conducted RF
3 – 300 MHzConducted RF, Free Space Radiating
300 MHz – 3 GHzFree Space Radiating RF, Slightly Directional
3 – 22 GHzFree Space, Low Attenuation., Highly Directional
22 – 60GHzWater Vapor Absorption Band
60 GHz – 3 ThzLimited Usage For Covert Surveillance

Commonly Used Professional and Enforcement Bugging Frequencies

MeasurementTypeDevice
300 Hz – 15 kHzAudio DetectionBase Band Audio
10 – 150 kHzUltrasonicUltrasonic Audio
20 – 350 kHzVLF-Free SpaceVideo Cameras & Tape recorders
0.3 kHz – 50 MHzCarrier Current99% Voice (CC and PLA)
10 – 450 MHzCarrier Current99% Voice (AC Mains Antenna)
3 kHz – 50 MHzFree Space-HF99% Voice
30 – 300 MHzFree Space-VHF10% Video/80% Voice/10% Data
300 – 900 MHzFree Space-UHF25% Video/60% Voice/15% Data
900 MHz – 3 GHzFree Space-MW150% Video/40% Voice/10% Data
3 – 18 GHzFree Space-MW2Mostly Video and Data
18.0 – 26.5 GHzFree Space-MW3Mostly Video and Data
26.5 – 40.0 GHzFree Space-MW4Optional, based on threat
150 – 450 nmUV/InfraredModulated UV Light Bugs
350 – 700 nmModulated Visible Light Bugs (450 to 675nm very common)
700 – 1100 nmVery CommonAudio Transmitters/Lasers (880 to 950nm)
800 – 1510 nmAudio Transmitters/Laser Microphones (rare)
750 – 900 nmNight Vision Illuminators
850 – 1750 nmIR Bugs and IR Illuminators
450 nmModulated Tungsten bugs
490 nmModulated Sodium bugs
575 nmModulated Fluorescent bugs

Tactical Bugs

RangeTypeDevice
225 – 400 MHz“Throw away” bugs (10uw-300mw Beer can bugs)
290 – 330 MHzMicro-powered Bugs (5uw-10mw Cigarette Butt Bugs)
180 – 430 MHzSpread Spectrum Wafer Bugs (1.5mm thick * 10mm * 2.9mm)
30 – 500 MHzTactical Repeaters (75mw-300mw)
285 – 400 MHzTactical Repeaters (50mw-10watts)
100 – 152 MHzVHF Tactical Repeaters (300mw-25watts)
135 – 174 MHzVHF Tactical Repeaters (300mw-25watts)

Frequencies Used By The Average Joe

FrequencyTypeDevice
44.500 – 51.000 MHzBaby and Room monitors (49.83, 49.845, 49.875, etc)
72.100 – 75.400 MHzHearing Assistance Systems
54.000 – 150.000 MHzKit Bugs
78.000 – 115.000 MHzCheap out-of-band FM Bugs
112.000 – 142.000 MHzCheap out-of-band FM Bugs
140.000 – 160.000 MHzCheap out-of-band FM Bugs
60.000 – 320.000 MHzLow Cost kit bugs
398.000 – 406.000 MHzDECO Bugs (398.600/605, 399.450/455, 399.025/030, 406 MHz
25.000 – 450.000 MHzEuropean/English Kit Bugs
150.000 – 216.000 MHzTypical VHF “Body Wire” & Pro-Grade Bugs
109.000 – 140.000 MHzDigital VHF Pro-Grade Bugs
138.000 – 174.000 MHzTypical “Spy Shop” & LE Cheap VHF Bugs (155-172 Popular)
140.000 – 150.000 MhzPopular Xandi Flea power kits (143/144 MHz)
150.000 – 170.000 MHzPopular Japanese Flea power kits (under 5mw)
150.000 – 220.000 MHzCommercial Wireless Microphones
169.000 – 172.000 MHz47 CFR 90.265 Authorization *** VERY Popular ***
174.000 – 216.000 MHz47 CFR 2.106 (NG115) Authorization
395.000 – 410.000 MHzGerman UHF Bugs (PK Electronics)
365.000 – 455.000 MHzEnglish UHF Bugs (Lorraine/Ruby Electronics)
219.000 – 530.000 MHzEnglish UHF Wireless Microphones (300-500 popular)
470.000 – 608.000 MHzCommercial Wireless Microphones
730.000 – 806.000 MHzCommercial Wireless Microphones
310.000 – 980.000 MHzSony Bugs (.1mw – 3mw, Spread Spectrum)
470.000 – 489.000 MHzSony Bugs (2.5mw – 20mw, WFM, Ultra low power)
770.000 – 810.000 MHzSony Bugs (2.5mw – 20mw, WFM, Ultra low power)
902.000 – 928.000 MHzSony Bugs (2.5mw – 20mw, WFM, Ultra low power)
947.000 – 954.000 MHzSony Bugs (2.5mw – 20mw, WFM, Ultra low power)
889.000 – 960.000 MHzModified Cordless Phones (S/S & Hoppers)
380.000 – 480.000 MHzVideo Bugs – UHF TV Channels
430.000 – 820.000 MHzPopular US Video/Audio Bugging Systems
890.000 – 960.000 MHzVideo Bugs – US (902-928 Hot)
905.000 – 928.000 MHzVideo/Audio Consumer Products (i.e. Recoton)
1.100 – 1.400 GHzVideo Bugs – *Very Hot in US/England/France/etc*
1.700 – 1.930 GHzVideo Bugs – US
2.400 – 2.500 GHzVideo Bugs – US *** VERY Popular ***
3.500 – 4.500 GHzVideo Bugs – *Very Hot in England/France/etc*
5.725 – 5.850 GHzVideo Bugs – US *** VERY Popular ***
6.200 – 7.500 GHzVideo Bugs – US *** VERY Popular ***
8.00 – 12.50 GHzX-band Audio/Video Bugs
20.00 – 26.00 GHzK-band Audio/Video Bugs (Gaining Popularity)
70.00 – 110.00 GHzM-band Audio/Video Bugs (Gaining Popularity)

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