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                The International Information Retrieval Guild                
 
                                   Presents
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                The IIRG Technical Journal Volume I,  Issue 2                
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          Dec 1993            /         Editor:  nuis        
 

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                       - In This Issue of the Journal -   
                    Ĵ
                            The IIRG Line Monitor         
                    


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    OFFICIAL DISLAIMER...

    All information in the IIRG Technical Journal is Member contributed
    material.  The Publishers and Editors of THE IIRG disclaim any liability 
    from any damages of any type that the reader or user of such information
    contained within this journal may encounter from the use of said 
    information.  All files are brought to you for entertainment purposes
    only.  We also assume all information infringes no copyrights and hereby
    disclaim any liability or responsibility.

    IIRG Technical Journal is (C) 1993 by The IIRG
    IIRG and INTERNATIONAL INFORMATION RETRIEVAL GUILD is (C) 1982

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                                   Note

  Beginning with this issue, a typeset, printer-ready version of The IIRG
  Technical Journal, complete with all drawings and schematics is provided
  in HP PCL format.  If you have access to an HP Laserjet Series ][ or
  compatible, simply copy the included IIRGTJ02.PCL file to the printer,
  i.e., copy iirgtj02.pcl lpt1: /b.  Postscript support for future issues
  is in the works.

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                    Ŀ
                              Line Monitor Device          
                    Ĵ
                     Design and Implementation: Mercenary  
                     Technical Quality Assurance: Tom Icom 
                    


                        ĿĿĿ
                          ô Section 1: Principle ô  
                          

 Given the wide availability and ease of use of today's telephone
 surveillance devices, it is almost a necessity to have in place a means to
 detect unauthorized monitoring of your voice and data lines.  While it is
 true that there is no device capable of detecting a "tap" at the switch (as
 most will be that are performed by federal agencies), it is still advisable
 to check for parasitic taps that are planted within the immediate vicinity
 of the phone, as will be the case with those installed by freelancers
 such as private investigators and corporate spies, or in some instances,
 those placed by local authorities or even your spouse or the kid next
 door...

 In this issue of the IIRG Technical Journal, we will look at an inexpensive
 means of providing what we consider to be a basic level of protection
 for your phone lines.  The Line Monitor will warn of both parasitic
 intrusions on your telephone lines and eavesdropping on an extension
 phone. 

The basis for our design is the commonly available ECG 955M
IC-Timer/Oscillator Integrated Circuit.  The circuit monitors the line
current and looks for any distortion to voltage levels or line impedance
that would be caused by a parasitic tap.


                   ĿĿĿ
                     ô Section 2: Implementation ô  
                   

  Parts List
 
  The following items are needed for construction of the Line Monitor.
  References to Diagram 1 apply to the included shematic contained in
  DIAG1.GIF.  

1.  Diagram 1, MOD IN
    One 4-Position PCB Modular Jack
    
    Mouser Stock # 154-UL6441   Price $1.08
    Digi-Key Part # H9081       Price $1.57

2.  Diagram 1, D1
    Eleven 1N4148 Diodes

    ECG Cross Part # - ECG519 - D-Si, Fast Switching, 4 ns, 100 prv,DO-35
    NTE Cross Part # - NTE519 - Diode-Si Fast Switching, DO-35

3.  Diagram 1, 955M
    One 7555 IC

    ECG Cross Part # - ECG955M - IC-Timer/Oscillator, 8 Pin DIP
    NTE Cross Part # - NTE955M - IC-Timer/Oscillator, 8 Pin DIP

4.  Diagram 1, D2
    One 1N5246B Zener Diode

    ECG Cross Part # - ECG5025A - ZD - 13 thru 200.0V, 0.5W,
                                  5% tolerance,Axial Lead
    NTE Cross Part # - NTE5025A - Zener Diode, 16.0V, 1/2W, DO-35

5.  Diagram 1, T1
    Three PN3646 NPN Transistors

    ECG Cross Part # - 123AP - T-NPN, Si, AF/RF AMP, CB Dr, TO-92
    NTE Cross Part # - NTE123AP - Transistor-NPN, Si-AF/RF AMP, TO-92

6.  Diagram 1, POT
    One Potentiometer, Spectrol 63X101

    Mouser Stock # - 594-63X101 - 100 ohm   Price $1.10
    Digi-Key Part # - 1FA12 - 100 ohm   Price $0.99

7.  Diagram 1, C1, C2
    Two 104K Capacitors, 0.1f

    Mouser Stock # - 140-PD250K104      Price $0.51
    Digi-Key Part # - P3104         Price $1.02

8.  One Project Box With PC Board

    Radio Shack Catalog # 270-283    Price $4.39

9.  Diagram 1, RED, GREEN
    One Green LED, One Red LED

    Radio Shack Catalog #'s - Green - 276-022   Price $0.99 for 2
                - Red - 276-041     Price $0.99 for 2

10. Diagram 1, MOD OUT
    One Modular to Modular Phone Line Cord

    Radio Shack Catalog # - 279-390   Price $0.99

11. Resistors (Various)

    Diagram 1, R1 - One 27K Ohm (Red, Violet, Orange)
    Diagram 1, R2 - One 4.7K Ohm (Yellow, Violet, Red)
    Diagram 1, R3 - One 10 Ohm (Brown, Black, Black)
    Diagram 1, R4 - Two 47M Ohm (Yellow, Violet, Green)
    Diagram 1, R5 - Two 10M Ohm (Brown, Black, Blue)
    Diagram 1, R6 - One 10K Ohm (Brown, Black, Orange)
    Diagram 1, R7 - One 1M Ohm (Brown, Black, Green)



 Circuit Layout

 Most construction details can be gleaned from the provided schematic.
 However, two points should be noted.  Firstly, for ease of construction,
 we would advise that the parts be laid out on the pc board before any
 soldering is performed.  Following the placement shown in the schematic
 will provide a good starting point.  Lastly, while it should be obvious,
 one end of the modular-to-modular phone line cord needs to be cut in
 order to solder the leads to the pc board at points Y, R, G, and B.

 Line Monitor Installation

 On a single-line modular telephone, you must first remove the modular
 cord that connects the telephone to the wall jack.  Plug the Line Monitor's
 modular connector into the wall jack and insert the telephone's modular
 connector into the line monitors modular jack.

 Line Monitor Calibration

 1. Pick up the telephone's receiver.

 2. Dial a number of a local VMB system or any other demonstration line.

 3. After your call is connected, adjust the line monitor's potentiometer
    until the red LED comes on.

 4. Slowly turn the potentiometer's screw back until the green LED comes
    on and the red LED goes off.

 5. Line Monitor calibration is done, but please note: If the red LED
    comes on while dialing a number, then the sensitivity adjustment is
    too high.  Re-adjust your monitor until this does not happen.


 Line Monitor Notes:

 1. A "Clear" (Green LED) condition will be shown as long as the monitored
    phone line is within tolerance for line impedance and voltage.

 2. The Line Monitor is not designed to work on phone systems that have 
    24 Volt phones or stations.

 3. The line monitor device is designed to detect hard wired (parasitic)
    taps.  Consequently, it will not detect high impedance devices such
    as suction-cup magnetic taps



 Editor's Note:

 It is mandated within the Declaration of Independence, and The Constitution
 of the United States that it is every citizen's responsibility to employ
 whatever means necessary to keep this country free.  James Madison once
 said "A people who mean to be their own governors must arm themselves
 with the power knowledge gives."  The great senator Barry Goldwater
 said "Extremism in the defense of liberty is no vice.  Moderation in
 the pursuit of freedom is no virtue."

 Therefore, we believe that the use of techniques and/or devices described
 in this publication is justified in challenging the totalitarian bastards
 who consistently take actions to eliminate our rights of privacy and
 personal freedom guaranteed under the constitution, but only after all
 other means of dealing with these individuals have been exhausted.

 "When more than fifty percent of the people are breaking the law, there
  is something wrong with the law..."




    Comments and suggestions about this and future issues of the IIRG Tech
     Journal are welcome.  Contact nuis at the IIRG WHQ, the Rune Stone.


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                  The IIRG Technical Journal (C) IIRG'1993
                        - May Odin Guide Your Way -
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