Eddy Wireless CMS-15, Instruction Manual

Page: 9 / 18

Tune – Tunes through both of the above ranges from low to high.
THEORY
Carrier Current Transmitters, marketed as “wireless intercoms” and “wireless room
monitors”, consist of a transmitter and sensitive microphone which intercepts room
conversations and sends them along the power lines to a receiver. Very little signal radiates
away from the power line. That is why a countermeasures sweep should include an
examination of power lines in the target room with a tune-able carrier current detector.
Most carrier current devices fall in the frequency range of 30 KHz to 500 KHz. The popular
wireless intercoms sold in electronics stores are usually set to operate between 150 KHz
and 300 KHz. The P-04 covers a wider frequency range than this to catch devices whose
operating frequency has been modified by the eavesdropper.
The P-04 can also be used to detect video cameras. These cameras have a horizontal
oscillator – most operate at 15.75 KHz- that radiates a signal that can be picked up and
detected by the P-04.
GETTING STARTED
If a battery has not already been installed, go ahead and install one now. Use Eveready
522 (alkaline) or equal. The battery compartment is accessed by using a flat blade
screwdriver and separating the top cover from the bottom cover. Connect the battery to the
battery snap and place in the holder. Reinstall the cover.
The P-04 Range switch should be “ OFF ”. Plug the P-04 cable into the probe jack on the
top end of the TD-53. If you plan to use the headphones, go ahead and plug them into the
TD-53 headphone jack.
FINDING CARRIER CURRENT DEVICES
Use the following procedures to check for carrier current devices on AC power lines:
1. Turn on a sound source in the target room such as a radio. Next turn on the
TD-53 and set the MODE switch to “ verify ” and the SENSITIVITY switch to “ high ”.
2. Ignore any reading on the TD-53 LED meter. Set the P-04 RANGE switch to
“10-130” and the TUNE control to “ Min ”. The power on LED on the P-04 should be on.
3. Turn on all appliances, lights, etc. that normally operate in the target room.
Position the P-04 antenna next to the line cord for all of the above appliances or lamps.
Remember that you are trying to pick up a low level signal that may be traveling along the
AC power lines. If the signal is there, it will also be present on any line cords that are
plugged in.
4. Slowly tune Range control from “ Min ” to “ Max ” and back again while listening
for the sound source.
5. Switch Range switch to “50-600” and repeat step 4.
9