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1. c GSM cell data and tone about 2 kHz mobile pulses depending on talking d Listening device most of the RF listening devices are using analog modulation systems Those most common devices are heard in the earphone the room sounds are getting stronger closer to the bug and the acoustic feedback can eventually appears e Dangerous signals not covered by a d The maximum of these signals has to be found it is necessary to prove if the signal is originated in the swept area or if the signal is incoming from outdoor IV Localization of listening device Close to the transmitter there is a rapid increase of the RF field To improve localization accuracy it is better to shorten the telescope antenna the indicated RF LEVEL decreases which enables a sharper detection of the signal maximum Power E e gt 1W 1mW PC spurious radiation tuW 1nW J 1MHz 10MHz 100MHz 1GHz 10GHz 20GHz Frequency Fig 1 Ability to detect various radio listening devices Level 0 0 1 1 10 100 Distance m Fig 2 Dependence of the indicated level on the bug distance for 0 1 1 10mW ERP V Sensitivity frequency range bug distance and power calculation The RFD 22 is a very sensitive detector with extremely large frequency range detecting real listening devices up to 20 GHz Fig 1 depicts the ability of RFD 22 to detect various radio listening devices for an indication RF LEVEL 2 and the dis2. signal disappears e g the bug turns off the display returns to Pr and in the 8 sec period the highest alarm signal level is displayed For example alternating PE and 54 show that the strongest alarm signal reached RF level 54 The RFD 22 detects even very short pulses gt 80 us important to detect some advanced digital systems This speed can cause detection of different disturbances like switching electric appliances lamps etc To eliminate detection of electric disturbances do not use mains power supply and place the RFD 22 as far as possible from electric cables and mains connected devices Switching to MEASURE mode and back to PROTECT mode erases the PE memory and stores a new background to the background memory Sb Warning No radio bug should be active during storing of the background switching from MEASURE to PROTECT mode Also avoid any mobile or other wireless device to be active during storing of the background Vil Detection of pulse transmitters Ensure a permanent conversation or other sound in the checked area to force a hidden pulse transmitter to transmit as much data as possible Set the PROTECT mode Systematically move the RFD 22 to find the signal maximum displayed after PE Set the AUDIO switch to ON to be acoustically informed about each signal activity Vill Detection of SHF frequencies 3 20 GHz For very high frequencies particularly above 3 GHz the telescopic antenna loses efficiency For SHF detect
3. Radio frequency detector RFD 22 User manual Version 1 0 User manual RFD 22 is an advanced broadband high sensitive radio frequency detector Parameters of RFD 22 are optimized for detection of all type wireless bugs including the latest technology RFD 22 can be used to detect digitally encoded signals spread spectrum hopping and pulse transmissions and signals at extremely high frequencies up to 20GHz Since RFD 22 is a state of the art device technical and operational training is recommended I Controls inputs outputs LED display 2 characters Main switch ON OFF Audio alarm switch AUDIO ON OFF Mode switch MEASURE PROTECT LED CHARGE charging indicator Connector EARPHONE earphone stereo type 8 32 ohm Connector EXT POWER external power and charge Connector EXT PROBE Telescope antenna Il Power ON battery check and charging After power on the device performs a self test LED shortly displays C7 and if AUDIO switch is ON the melody tone can be heard After the self test the device is set to the selected mode MEASURE or PROTECT The RFD 22 constantly measures the battery health status If Lb is periodically displayed followed by low frequency tone the battery should be replaced or the accumulator should be charged WARNING deeply discharged battery can cause either no function or displaying C7 only 9V battery or accumulator is below the bottom lid which can be removed by the na
4. h window max 65 desk max 40 PC max 50 other max 35 If a higher RF level is detected it is recommended to use the earphone and find the signal source a bug or to call a specialist to provide appropriate countermeasures VIP permanent protection Adjust the length of telescope antenna to 4 10 cm Put the RFD 22 as close as possible to negotiation table Adjust PROTECT mode Do not use mobile phones during storing background during switching from MEASURE to PROTECT mode Pr is displayed in normal status Any number replacing Pr means a danger that a bug is activated or GSM or any other wireless device is active Short alarms can be detected because the GSM phones are periodically checking their system connection For acoustic warning switch ON the AUDIO to be acoustically informed about a danger Technical specification Frequency range 0 5MHz to 20GHz Typical sensitivity 0 08uW ERP 400MHz 5 cm level 3 Dynamic range 43dB Detectable pulse width gt 80us Geiger click indication internal buzzer LED indicator 2 characters Instant signal strength indication numerical 127 levels Peak level indication numerical 127 levels Alarm memory record of highest level Built in telescope antenna adjustable from 1 to 38cm External probe 3 5 mm mono connector Earphone stereo type 8 320hm Battery low indication below 7 2 V External power supply 12 20V DC unstabilized Acc
5. il to the cut in the bottom lid Be careful when inserting the battery and closing the lid not to damage the battery wires and to set the lid properly It is recommended to use a 9V NiMH or NiCd accumulator which can be recharged by an external power supply 12 to 20V DC with pole on the central pin Charging time of the fully discharged accumulator is 14 hours Longer charging times are allowed since an internal regulation circuit avoids accumulator overcharging Illl Measurement sweeping bug detection Adjust MEASURE mode and push out the telescope antenna The signal level is displayed in values 0 99 and AO C7 Example B8 118 Slowly move the RFD 22 and properly check the entire room and all objects inside the swept area The listening device is usually ingeniously disguised A rapid increase of the RF field observed at a spot or close to an object signalizes a potential RF eavesdropping During sweeping use the earphone output EARPHONE and listen to the demodulated signal Often a bug can be heard in the earphone but using earphones primarily helps to recognize legal signals like TV and radio broadcasting or GSM If the AUDIO switch is ON the Geiger click audio indicator is enabled and helps the user to find the strongest signal by increasing the click frequency with an increase of the RF signal level Characteristics of typical signals a TV carrier 50 Hz noise usually stronger close to windows b Broadcast voice or music
6. ion it is better to fully push the antenna into the RFD 22 The active part of RFD 22 is the front lid The strongest level can be detected if the front lid is pointing to the source of SHF signal IX External probe For sweeping high ceilings or hardly reachable places connect the external probe The probe disconnects the internal detector RFD 22 functionality remains the same only the frequency response is equal to the connected probe parameters Warning e Do not open the device there are no elements adjustable without special equipment e Use 9V 6F22 battery or 9V NiMH or NiCd accumulator Never use non rechargeable alkaline batteries if the mains power supply is connected e Short click in the earphone each 9 sec is a self calibration of the detector it is no fault or a signal to be checked Simplified usage of RFD 22 VIP application VIP operative sweeping The security service specialist sweeps the office and creates a written protocol containing maximum levels measured at specific places in the VIP office Then the VIP user checks if there is a remarkable increase of RF level comparing with originally listed values at the specified places This check should be performed either before or better during a VIP meeting Any level increase especially close to mobile phones GSM should be carefully examined An example of a written protocol made by a specialist for VIP operative sweeping CEO office Antenna full lengt
7. tance of 5cm from the signal source From the graph we can observe that effective radiated power ERP 1uW 1000x less than typical bug is radiating can be detected up to 10GHz A more realistic 1mW device can be detected up to 20 GHz Fig 2 depicts a dependence of indicated LEVEL on the DISTANCE for three typical bug output powers ERP Since close to the transmitter the electromagnetic field is very non homogeneous the highest measured level is valid at the optimal position and length of the RFD 22 antenna The plots at fig 2 are valid in the frequency range 80 500 MHz typical bug frequencies If the transmitter distance is known the radiated power ERP can be read from the graphs and consequently it is possible to deduce the theoretical range of the listening device in the real environment VI Permanent protection Switch the device to the PROTECT mode The LED displays Sb store background followed by a number which is an automatically adjusted alarm threshold The threshold is always higher than the local background its level is equal to background 5dB If the radio field is bug free the LED displays Pr protect In case of an activation of a bug or another increase of the radio field an alarm is indicated Instead of Pr the LED displays a number which represents the RF level of the alarm signal If the AUDIO switch is ON the warning tone is enabled The alarm indication is active as long as the RF level increases When the radio
8. umulator recharge circuit optimized for NIMH or NiCd Battery 9V model 6F22 or 9V accumulator Current consumption 8 to 10 mA Mechanical size 150 x 58 x 29 mm Weight 245g
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