This is referred to as feedback detection or loop detection and will often locate the bug. If the radio begins to squeal then slowly move it around the room until the sound become very high pitched. Look for the transmissions at far ends of the FM radio band, and at any quiet area within the FM band. Many amateur and spy shop eavesdropping devices use frequencies within or just outside the FM radio band, these signals tend to drift and will "quiet" an FM radio in the vicinity of the bug. Your AM/FM radio has suddenly developed strange interference.On an added note: the most common command tones for illicit eavesdropping devices are 2100 Hz and DTMF-C, but any tone combination may be used. Such devices create a "command tone" when the subject hangs up the phone (so you must ensure that all of your phones are hung-up). If you hear a faint solid dual tone it is a dead giveaway of someone using a "slave" eavesdropping device on your (or one of your neighbors) telephone lines. Then with the phone hung-up listen to your telephone wiring. To check for something like this you would have to obtain a "recorder starter" interface (with a VOX option), or some kind of a high gain audio amplifier such as a uAmp or Kaiser 1059. You can hear a tone on your line when your phone is on the hook (by using an external amplifier).Of course it may also be nothing more then a fax machine or modem calling the wrong number (but a TSCM person should evaluate the situation to make sure). This is also a key indicator of a harmonica bug, or infinity transmitter being used. This is an indicator of a slave device, or line extender being used on your phone line. Your phone often rings and nobody is there, or a very faint tone, or high pitched squeal or beep is heard for a fraction of a second.There is probably somebody listening to everything you say or do within twenty feet of the telephone (if this is happening). This is often caused by a hook switch bypass, which turns the telephone receiver into an eavesdropping microphone (and also a speaker). Sounds are coming from your phone's handset when it's hung up.It could be nothing more then a problem with your phone line or instrument, but a TSCM person should evaluate the situation to make sure. This is also a sign that an amateur eavesdropper or poorly trained spy is playing with your phone lines. This is caused by the capacitive discharge, which occurs when two conductors are connected together (such as a bug or wiretap on a phone line). You have noticed static, popping, or scratching on your phone lines.On the other hand you could simply be experiencing a flaw in the line, but you should check it out. Professional eavesdroppers and their equipment usually do not make such noises so if this is going on it could indicate that an amateur eavesdropper is listening in. Surveillance devices often cause slight anomalies on the telephone line such a volume shift or drop-out. This is commonly caused by an amateur eavesdropper when they attach a wiretap, or activate a similar listening device. You have noticed strange sounds or volume changes on your phone lines.People seem to know too much regarding your private and/or business activities.How would you like the plans for the corporate takeovers you're planning to become public knowledge? Would copies of your product designs be of any use to your competitors? Would it be beneficial for your competitors to know how much you're quoting for the same project? Secret meetings and bids seem to be less than secret.Ĭonfidential meetings and bids are very popular targets for corporate spies.When your competitors know things that are obviously private, or the media finds out about things they should not know, then it is reasonable to suspect technical eavesdropping or bugging. Often the loss of your secrets will show up in very subtle ways so you should always trust your instincts in this matter. Theft of confidential information is a multi-billion dollar underground industry in the United States. This is the most obvious indicator of covert eavesdropping activities. Others know your confidential business or professional trade secrets.However, do not call from a suspect telephone, cellular telephone, or cordless phone and understand that it is critical that you should get someone from Granite Island Group out to your location as quietly, and as quickly as possible. If any of the following warning signs apply and you are concerned about covert eavesdropping or wiretapping, then it would be wise to immediately contact Granite Island Group (978) 381-9111, and schedule a "Bug Sweep" or TSCM Inspection. Warning Signs of Covert Eavesdropping or BuggingĪre you a potential target? If eavesdropping on anything you say, write, or do could increase someone else's wealth or influence, then the answer is yes.
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