PHJD24 – Counter Surveillance Equipment

PHJD24 – Counter Surveillance Equipment


The counter surveillance equipment PHJD24 has been designed for detection of nonlinear junctions.
Nonlinear junctions include a wide variety of components such as diodes, transistors, IC’s, etc. The PHJD24 can detect electronic circuits such as hidden transmitters, and tape recorders even though DC source is NOT applied.

Corrosive junctions, hence discards false alarms. Both 2nd & 3rd harmonics The PHJD24 is a state-of-art the Non Linear Junction Detector based on the latest technology and includes DDS and DSP components. The system provides an evaluation of the 2nd and 3rd harmonic.

When the system receives a strong 2nd harmonic, it indicates the presence of electronic components while a strong 3rd harmonic reception indicates false is displayed at the same time.


1. Transmitter:

a. Frequency: 840 – 915 MHz
b. Output power equal and no more than 4W (continuous)
c. FM modulation continuous (AM if customer requires)

2. Receiver:

a. 1,680 – 1,830 MHz and 2,520 – 2,745 MHz respectively
b. Sensitivity -133dBm

3. Antennas:

a. Control function with volume and power selection
b. All cables and connectors are secured

4. Output:

a. Audio: with and without headphone
b. Display: visual display distinguishing 2nd and 3rd harmonics
c. False alarm rate: lower than 3%

5. Power:

a. Battery: rechargeable with minimum 3 hours operation on single operation full charge. The battery has protection against reversed polarity.
b. Battery charger: 180 – 240V

6. Detects and identifies semiconductor and corrosive bimetal junctions


  • Fully digital system
  • Automatic or manual channel select
  • High power transmitter (+38 dBm)
  • Excellent receiver sensitivity
  • CW or Pulse mode operation


  • LED Display with high brightness
  • High gain circular antenna
  • Minimum setup time
  • Robust & lightweight design
  • Easy to use
  • Rechargeable batteries Li-Polymer



Output Power- Adjustable 18 – 38 dBm (Max. 8W)
Frequency Range 840-915 MHz
Signal Source DDS
Antenna 50 Ohm Directional Antenna
Antenna Gain 4 dBi


Sensitivity -133 dBm
Frequency Ranges 1,680 – 1,830 MHz

2,520 – 2,745 MHz


Channel Select 1 to 825
Output Power 18 – 38 dBm with 1 dB steps
ON/OFF Touch panel

Mode of Operation

Channel Select Manual or Automatic Channel Select
Output Power Manual or Automatic Output Power
Display Double row LED display

Mode of Operation

Operating Temp. -5ºC – +60ºC
Humidity 5% – 90%


Sensing head 21 cm in diameter
Weight 2.5 Kg

*Specifications are subject to change without prior notice


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