GBPPR Research: Military and Espionage Projects
These projects do not belong to me. As a matter of fact, they constitute the property of GBPPR Research Group (Green Bay Professional Packet Radio). Download them while possible, cause I might be asked to remove them from the site.
Baby Monitor Bug
Modify a simple 49 MHz baby monitor to transmit on a non-standard frequency to prevent accidental detection.
Cellular Phone Jammers
Devices to jam the downlink frequencies on various cellular telephone systems. Prevents the cellular phone user from sending or receiving phone calls within the small jam radius. Advanced electronic and RF engineering technical skills will be required.
AMPS Cellular System Call Monitor
Utilize an old, analog AMPS Motorola bag-style cellular phone to monitor cellular phone conversations and also track the hand-off datastream. This will allow you to track and listen to a person's cellular phone call even as it is passed off to different cells.
Commie Counter
Modified Radio Shack portable infrared security alarm connected to a LCD counter display. Useful for silently detecting if anyone is following you or alerting you to any illegal searches of your residence.
Detecting Police Personnel/Vehicles
It is possible to detect, track and locate police officers (hidden or otherwise) by using their own radios and mobile data terminals (MDT) as locater beacons.
GPS (L1) Jammer
A low cost device to temporarily disable the reception of the civilian coarse acquisition (C/A) code used for the standard positioning service (SPS) on the Global Positioning System (GPS/NAVSTAR) L1 frequency of 1575.42 MHz.
Telephone Hookswitch Bypass Methods
Retyped and cleaned up from an old BBS text file.
There are many ways to convertly monitor conversations. A microphone or miniature radio transmitter could be planted in the target area. High gain amplifiers with special microphones are used to listen through walls and windows. Parabolic microphones and laser monitoring systems are used to listen from far away. The telephone can be tapped or bugged in a variety of ways. Many times, however, electronic surveillance involves costly equipment that may not be recovered.
There is a cheap and effective way to bug a room. With a piece of wire, an audio amplifier from Radio Shack, and a few cents worth of electronic parts you can modify a telephone to monitor room conversations. This modification, called the "hot-mic" or hookswitch bypass, uses the phone's own microphone and sends the room's audio down the phone line without affecting phone operation. This report will show several ways to perform a hot-mic modification and also how to detect one.
Note: This report is based on the Western Electric 500-type Touch Tone telephone. The modifications will work on other telephones but details such as wire color will be different.
Infrared Beacon
Turn a common flashing red LED safety beacon into an infrared beacon which you can only view using your night vision device. Good for marking hidden caches or allies while you're on your missions.
Using an Oscilloscope as a Lie Detector
Originally printed in Understanding and Using Your Oscilloscope, by Allied Radio.
Polygraphs (lie detectors) are complex devices that measure a number of physiological characteristics of a person who is being questioned. In this introductory discussion, we can describe only one basic characteristic that is measured. Most polygraphs are actually oscillographs that make a permanent record of the waveforms. However, an oscilloscope can be used when a permanent record is not required. Lie detectors are not infallible, by any means, and many persons are able to beat the test by tensing their muscles and various other dodges.
Portable Low Power FM Broadcast Station
Portable 25 Watt radio station capable of transmitting on 88-108 MHz. The exciter is a Broadcast Warehouse 1 Watt PLL Exciter. Frequency is changed via two push buttons and the operating frequency and PLL lock condition are shown on the LCD display. The RF power amplifier is a Veronica 25 Watt Power Amplifier and does an easy 20+ watts across the band. The microphone is a M-80/U military style waterproof and noise cancelling type. For a cheap and quick antenna, use a set of old TV rabbit ear antennas fed with coax through a coaxial-loop balun.
Using an Oscilloscope as a Lie Detector
Originally printed in Understanding and Using Your Oscilloscope, by Allied Radio.
Polygraphs (lie detectors) are complex devices that measure a number of physiological characteristics of a person who is being questioned. In this introductory discussion, we can describe only one basic characteristic that is measured. Most polygraphs are actually oscillographs that make a permanent record of the waveforms. However, an oscilloscope can be used when a permanent record is not required. Lie detectors are not infallible, by any means, and many persons are able to beat the test by tensing their muscles and various other dodges.
Low Noise, High Gain Microphone Amplifier
It appears to be possible to convert an old MMDS parabolic dish antenna into a parabolic microphone. All you really need to do is cover the dish section and dipole reflector with heavy-stock cardboard, then mount a microphone element at the focal point. Construct the following low noise microphone pre-amp and hook everything up. The final device is sensitive enough to listen to singing birds, listen to birds through walls, and listen to birds typing their passwords and get their character lengths, etc...
Noise Canceling Electret Microphone
Use two standard electret microphone elements (Radio Shack part number 270-020C) to cancel out background noise. Strong signals close to the microphone elements are easily passed, while the lower power background noise is canceled out. See the December 2000 issue of QST magazine, pages 38-39, for more information and construction notes.
Low Cost Night Vision Device
Build a simple active-IR night vision device from a common black-and-white CCD camera, a handheld television and some infrared LEDs.
Noise Canceling Electret Microphone
Use two standard electret microphone elements (Radio Shack part number 270-020C) to cancel out background noise. Strong signals close to the microphone elements are easily passed, while the lower power background noise is canceled out.
Phone Line Harassment Devices
Homebrew your own simple phone line harassment devices, like those sold in "spy shops" for hundreds of dollars.
RF Bug Detectors
This is a high quality RF signal meter based around the Analog Devices AD8313 100 - 2500 MHz logarithmic detector IC. It is capable of detecting signals as low as -80 dBm.
Single Mode Inversion Voice Scrambler/Descrambler
Originally printed in Circuit Circus, by Charles D. Rakes.
This month we are going to take a very popular IC and use it in several circuits in the hope that at least one of them will tweak your interest enough for you to heat up your soldering iron and join in. We're going to spotlight on Signetics' NE602 low-power VHF double-balanced mixer. That 8-pin chip features a built-in local oscillator, a differential input amplifier, and a voltage regulator. The internal oscillator circuit will operate up to 200 MHz with either an external crystal or tuned-tank circuit. Its input and output resistance is about 1.5 k with an input capacitance of only 3 pF. The IC requires less than 3 mA of current with a supply voltage from 4.5 to 8 volts.
Using Sunlight to Intercept Audio - The Photophone
Adapted from the Forrest M. Mims III project book
On February 19, 1880, Alexander Graham Bell and Sumner Tainter, Professor Bell's laboratory assistant, became the first people to transmit their voices over a beam of electromagnetic radiation. Bell called his invention the "photophone" and said it was fundamentally a greater invention than the telephone.
Tactical Communications Jammer
Barrage (noise) jammer for VHF/UHF communications. Based around an old TV tuner with its local oscillator tapped and amplified. The tuner's voltage tune line is mixed with a sweeping, random noise signal.
Cellular Phone/GPS "Burst" Tracking Device Jammer
Developed for GBPPR's Directorate of Operations case officers operating out in the field, this device uses a neat little trick to jam most of the common cellular modem (CDPD or analog AMPS) controlled GPS tracking devices.