LA JERGA DEL CUERPO HUMANO

Leads the operator to the source of the transmission, usually by means of an audible rising and falling tone or an LED display.

3. Verification.

This allows the operator to listen to exactly what is being received and transmitted by the bug, hence allowing him or her to confirm a bug and not some completely innocent piece of equipment, such as a TV set, are giving the signal.

Again, much depends on the skill of the operator. No scanning procedure can be considered complete unless a careful physical examination of the room in question has been undertaken.

Hold Invader

... ...

... .

This is a very ingenious device that has a limited use for some very clever electronic eaves-dropping. It simply plugs in between your telephone base and the handset. (A telephone with a detachable handset is required.)

The hold invader works by putting the party you are calling on a 'false hold'. During this peri-od they hear the usual 'dead' sound in the earpiece and are given the impression that you are not listening to whatever they say. However, if they do make any remarks to a third party in the room the hold invader allows you to hear these! The hold invader device includes very powerful amplification electronics; even if the party being called places their hand over the mouthpiece then you may still be able to listen in to their conversation. The hold invader requires a degree of conversational skill to obtain best results. For example, you may call the other party and mention the name of a subject or a third party you wish to discuss. Then put them on the false hold. During this time you will be able to listen in to confidential remarks, which are made on the subject!

Voice Changer

Finally in our discussion of electronic surveillance we come to a device, which is not strictly surveillance nor a counter-surveillance device but which, nevertheless, has many possible uses. This is the voice changer. The voice changer is a device, which, as the name suggests, changes your voice to make it sound like someone else! It can change the tone and pitch of your voice and even change your accent. It can turn a male voice into a female voice and vice versa! The device simply plugs into your 'phone between the base and the handset.

Various different voice changers are available but they all work in the same way. It is prefer-able to choose a model, which does not incorporate a delay between speaking and the called party hearing your voice (as some cheaper devices do). An additional benefit of some devices is that they allow you to make a local call sound like a long distance/international tall and Vice versa.

The most important point to remember when deploying equipment of this nature is to ensure' that the tone, pitch and volume is consistent when making or receiving calls which purport to be the same person.

Summary

We hope you have found this guide to electronic surveillance equipment both informative and interesting. We cannot stress strongly enough that this is a complex specialist field which should not be entered into without more detailed information than is supplied in this introductory booklet.

If you intend to enter into private investigation on a professional level, the vast majority of your work will be done without recourse to this type of equipment. Where such equipment may be deemed helpful, its use is discussed within the main home study course.

Important Note

Some electronic surveillance and counter surveillance equipment presently available is either unapproved for connection to the public telephone system in the UK or consists of unlicensed transmitting devices. Its use (although not its purchase or possession) may be illegal in certain countries.

Audio Surveillance Equipment: A Beginner's Guide Audio surveillance equipment falls into two basic types:

• Equipment designed to monitor conversations in a room

• Equipment designed to monitor conversations over a telephone line

In either case, the conversation may be recorded on site, or may alternatively be transmitted to a receiver located elsewhere. In the latter case, the conversation may either be listened to 'live' or recorded.

There are several situations in which you may want to monitor, listen to, and possibly record a conversation. For example:

When you want to record a conversation in which you are participating. This may be for proof of a verbal contract, or for evidence to relay back to a client.

When it is necessary to record or listen to a conversation at which you cannot be present.

At the heart of every audio surveillance system is a transmitter. As the name suggests, this picks up the sound from a room or telephone conversation and transmits it to a receiver.

These transmitters are very small and can often be disguised as phone sockets, pens, calculators, etc. The conversation can then be heard via the receiver, which in turn may be linked up to a recorder, which, yes, records the conversation... simple!

Room Conversation Surveillance

There are two basic types of room transmitter:

1. Portable systems

These are ideal for situations where you have full or partial access. They are frequently used in meetings and negotiation situations. The transmitter is concealed within a briefcase, pen, or calculator, for example. These items can be taken with you into a room without suspicion and very discretely operated to transmit/record a conversation.

2. Fixed/static systems

These devices are best used in situations where you will not be present. There are two types:

Battery operated. Suitable where there is regular access, or where transmission requirements are fairly short term.

Electrical mains driven. Suitable for situations where regular access is not possible, or where the transmission requirements are fairly long term. This type of device is easy to install and can be left to operate indefinitely.

Telephone Conversation Surveillance

... ...

... .

There are two basic ways in which you can monitor a telephone conversation:

1. Wire Tap

This type of device is connected between the telephone line to be monitored, and a tape recorder. The recorder automatically records both sides of a conversation on that line, and switches off when the line is not in use. Alternatively, a tape-recorded can be used to auto-matically record the conversation directly to tape.

2. Telephone Transmitter

This is a small device, which is connected to the telephone line, or concealed inside the telephone socket, double adaptor or telephone receiver itself. Both sides of the conversation will then be transmitted each time the phone is used. The conversation can then be picked up by a receiver located 'off-site' and either listened to or recorded.

What do you need?

So, an audio surveillance system operates using a combination of:

• A transmitter (available in many guises)

• A receiver (the same type, regardless of transmitter)

• A recording device

Depending on the job in hand, you will need to employ one, two or all three of these. Our range of equipment has been specially selected to provide the most cost effective and efficient solutions to all your audio surveillance problems.

VEHICLE Surveillance - GIVE AWAY