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Addendum to "Schematics for building a broad band frequency jammer"

Discussion in 'Electronic Basics' started by Nina, Sep 18, 2004.

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  1. Nina

    Nina Guest

    I'd like to clarify something that I've missed:
    I'm ready to pay for your help if needed.
    TIA
    Nina
     
  2. Me

    Me Guest

    I see no reason to try and jam the entire band. Just put together a
    simple FM transmitter and as someone earlier suggested, transmit a
    squeal or something equally irritating over whatever station they're
    listening to. As M->P suggested, that will be far easier to accomplish
    technically. If you need schematics for a simple FM transmitter that's
    very easy to build, yet very effective I can help you there. I've
    built and used several on this design. In fact, there's a drag strip
    in GA using a transmitter I built off of this schematic using it to
    transmit race stats so people can listen in their cars and with head
    sets so they can hear over the loud car exhaust. Also got the board
    foil design and component layout making it super simple to build if
    you want to go the professional route.
     
  3. You will only get yourself in more trouble by jamming their radio.
    They can come over and beat you up if/when they find out who is jamming.
    You can go to jail or pay heavy fines when the authorities discover you,
    and they often need only a few seconds to pinpoint the source of an
    offending radio transmission.

    A much better alternative is to increase the sound isolation between you
    and the neighbor.

    Use some wooden planks to build a frame which covers the wall(s) to keep
    the construction steady. Put sound isolating material in the frame, use
    heave cloth type of materials, like heavy old type mattrasses (not foam
    plastic), different types of mats, wool blankets, etc.

    Fiber board is also good, combined with thick layers of heavy textiles on
    both sides.
    Put heavy mats on your floor if the sound comes from there.
    Build an inner ceiling if the sound comes from up above.

    After soundproofing your apartment, or parts of it, you can use your own
    sound source to create a low volume but masking effect which means you
    hear a lot less from your neighbors because you have your own favorite
    music running day and night.


    Another alternative is to talk to them and tell them to stop disturbing
    you. That will work if they are actually trying to make you do that.
    There are lots of religious people who are actively trying to make their
    neighbors strong minded so they can come to God or something like that.

    A problem with that approach is that they will probably only be
    encouraged by that and start other manipulations to force you to become
    even stronger. So you will end up with your brain filled up by the holy
    wrath, or the holy spirit, just like their brains.
     
  4. I can't speak for others, but no amount of money would convince me
    to sell out my own ethics so easily.

    I suggest you involve your local police. There are likely noise
    ordinances in your area which your noisy neighbor may be in violation
    of.


    --
    Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
    (Known to some as Bruce Lane, ARS KC7GR,
    kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
    "If Salvador Dali had owned a computer, would it have been equipped
    with surreal ports?"
     
  5. Meat-->Plow

    Meat-->Plow Guest

    I thought the person already had a transmitter
     
  6. John Fields

    John Fields Guest

     
  7. Me

    Me Guest

    Oops... didn't read all the way down, now did I. :)
     
  8. Meat-->Plow

    Meat-->Plow Guest

    The person said the PO was 5 watts. That sounds like a home
    brew unit. I used to own a 50 watt exciter. It was
    responsible for generating the FM frequency, modulating it,
    and amplifying it to 50 watts where it was originally
    designed to feed a 5000 watt commercial transmitter. It made
    a pretty decent little pirate radio station. I built a
    J-pole antenna out of some wire and PVC tubing and I got
    about a 5 mile radius with full quieting. Called the station
    WEED, muhahwahahahah.
     
  9. don ward

    don ward Guest

    If you need schematics for a simple FM transmitter that's
    very easy to build, yet very effective I can help you there. I've
    built and used several on this design. In fact, there's a drag strip
    in GA using a transmitter I built off of this schematic using it to
    transmit race stats so people can listen in their cars and with head
    sets so they can hear over the loud car exhaust. Also got the board
    foil design and component layout making it super simple to build if
    you want to go the professional route.

    How or where do i obtain the schematic and cb layout ??
    dnw
     
  10. Me

    Me Guest

    Hehehe. The little unit I was describing is good for about a mile
    radius with a properly tuned vertical dipole. I've used one in a
    convoy so everyone in the group could listen to the same jams on the
    trip.
     
  11. Me

    Me Guest


    Let me run to my office (where it happens to be), grab it and scan it
    then I'll stick it on one of my web servers and post a URL.
     
  12. Meat-->Plow

    Meat-->Plow Guest


    What's the power input to the final and what final amp ?
     
  13. Me

    Me Guest

    9 vdc keeps it legal, but it'll take considerably more.
    As far as the final... ugh... IIRC the final was a 2N3096, but I'm not
    sure now. It's been quite a few years since I did anything with that
    print. Will post when I've got it up.
     
  14. Meat-->Plow

    Meat-->Plow Guest

    Hmm that 2N3096 is just a little what, 500 mw max ?

    IIRC what I had had a single stud mounted MRF 315. 4 watts
    input, 40 something out on a 28 volt Vcc.
     
  15. Me

    Me Guest

    Don't recall now. Was thinking the 2N3906 would handle 1.5 W, but my
    books are at the office... and that may not have been the final
    anyway. I just don't remember. I do recall that heat dissipation, not
    max VCEO was the limiting factor on the power output and hence input
    voltage. Will post when I have it.

    The nice thing about this little gadget is that it can be built on a
    board the same size as the 9v battery driving it making for a very
    compact unit and it'll still make a mile with a decent antenna.
    Actually, I've got plans for much smaller transmitters designed for
    use as "bugs" that aren't much larger than the 2032 button cells that
    drive them although the range is considerably less. I've never
    bothered to assemble one though. This sort of thing would be just an
    experimental toy to me as I have no real use for such.
     
  16. Meat-->Plow

    Meat-->Plow Guest

    I've seen those things in -kit- form. Some with stereo
    output. 9 volts keeps the power under the legal limit but
    crank it up to 15 and it doubles. I set up one for a guy who
    had a drive-in restaurant. He had a 50's theme and wanted to
    broadcast 50's music for the drive in customers. Worked
    pretty decent once I found a spot that had no other local
    stations.
     
  17. Me

    Me Guest

    Ya, exactly the same thing I did for the drag strip. This wasn't a kit
    though. I don't recall who did the circuit design or where I got it
    from but it was just a schematic and description. I did the board foil
    design for it on a computer several years ago and built a few.
     
  18. Meat-->Plow

    Meat-->Plow Guest

    Last board I did was a little deal that sensed which of two
    assembly lines were down and then paged the right group of
    Millwrights to come fix it. It was just something to sense
    motion or the lack of it, then drive a two channel paging
    radio and some Motorola Page Boy pagers. Oh and I
    re-crystaled the pagers to match the channels on the radio.
    As far as I know that system is still being used today. I
    deployed it over 10 years ago.

    Before that I built a DTMF generator box to phreak phones
    with. Copied it from a real working Black Box. Ripped off
    everything I needed from Radio Shack. Board, etch pen, acid,
    741 op amps, everything even the case and touch tone pad.
    I ended up destroying it when my Greek buddy got popped by
    the FBI. While he had the original black box, he taped his
    girlfriend's back in Greece phone number on a reel to reel
    tape recorder. Then to call her, he would just hold the
    phone up to the speaker. Couldn't use a little portable
    recorder, too much wow and flutter to reproduce a steady
    enough pair of tones. The FBI never knew about what I had
    built, just the tape.
     
  19. Mark Zenier

    Mark Zenier Guest

    Legal on the FM band is about 30 nanowatts.

    47 CFR 15.239 "shall not exceed 250 microvolts/meter at 3 meters".

    Mark Zenier Washington State resident
     
  20. : On Sat, 18 Sep 2004 12:31:40 -0400, Me
    :
    :: On Sat, 18 Sep 2004 12:07:02 -0400, "Meat-->Plow"
    ::
    ::: On Sat, 18 Sep 2004 10:57:11 -0400, Me
    :::
    :::: On 18 Sep 2004 07:41:24 -0700, (Nina) wrote:
    ::::
    ::::: I'd like to clarify something that I've missed:
    ::::: I'm ready to pay for your help if needed.
    ::::: TIA
    ::::: Nina
    :::::
    ::::
    :::: I see no reason to try and jam the entire band. Just put together a
    :::: simple FM transmitter and as someone earlier suggested, transmit a
    :::: squeal or something equally irritating over whatever station
    :::: they're listening to. As M->P suggested, that will be far easier
    :::: to accomplish technically. If you need schematics for a simple FM
    :::: transmitter that's very easy to build, yet very effective I can
    :::: help you there. I've built and used several on this design. In
    :::: fact, there's a drag strip in GA using a transmitter I built off
    :::: of this schematic using it to transmit race stats so people can
    :::: listen in their cars and with head sets so they can hear over the
    :::: loud car exhaust. Also got the board foil design and component
    :::: layout making it super simple to build if you want to go the
    :::: professional route.
    :::
    ::: I thought the person already had a transmitter
    ::
    :: Oops... didn't read all the way down, now did I. :)
    :
    : The person said the PO was 5 watts. That sounds like a home
    : brew unit. I used to own a 50 watt exciter. It was
    : responsible for generating the FM frequency, modulating it,
    : and amplifying it to 50 watts where it was originally
    : designed to feed a 5000 watt commercial transmitter. It made
    : a pretty decent little pirate radio station. I built a
    : J-pole antenna out of some wire and PVC tubing and I got
    : about a 5 mile radius with full quieting. Called the station
    : WEED, muhahwahahahah.

    woah, now there's a coinkidence!
    http://www.weedfm.tk
    is a 70 watt pirate here I'm allegedly helping out with...

    --
    Steve Leyland
    mhm32x16 Smeeter#24 WSD#41
    flower: three 6 four 9 five 8 eight 9
    Alcatroll Labs Inc (bongwater maintenance dept)
    http://www.insurgent.org/~alcatroll/
    http://www.weedfm.tk

    =^MEOW MEOW ARMY^=

    A pessimist counting his blessings: 10 ... 9 ... 8 ... 7 ...
    ======================================================================
    "Warning to all:
    Steve Leyland is a trolling twat of the highest order. Killfile the
    muppet now and move on. Even the briefest of searches on his past
    UseNet posts will reveal the truth. You have been warned. *plonk*"

    bear, uk.rec.motorcycles
    ======================================================================
    "This sig is an abomination of all that is good and right about usenet.
    Do the entire world a favor and REMOVE YOURSELF FROM USENET ALTOGETHER,
    DUMBASS."

    miguel, soc.singles
    ======================================================================
    "must you include your 75847548574893579345 gigabyte sig file in every
    fucking post? You're very annoying."

    projectile vomit chick, alt.music.ozzy
    ======================================================================
    "I went to the Garden of Love,
    And saw what I never had seen;
    A Chapel was built in the midst,
    Where I used to play on the green.

    And the gates of this Chapel were shut
    And "Thou shalt not," writ over the door;
    So I turned to the Garden of Love
    That so many sweet flowers bore.

    And I saw it was filled with graves,
    And tombstones where flowers should be;
    And priests in black gowns were walking their rounds,
    And binding with briars my joys and desires."

    William Blake.
    ======================================================================
    "When the Earth has been ravaged and the animals are dying, a tribe of
    people from all races, creeds and colours shall put their faith in
    deeds, not words, and make the land green again. They shall be known as
    Warriors of the Rainbow, protectors of the environment."

    Native American prophecy


    |\ _.-'~~""'~`'~)
    /, ~-,__,,,.'~ ,-;;--''
    |,4) ./ ' ; ;/'
    '-~~;'@ ( ; ;
    _.--'' _.-_..' .;.'
    (,_..----''' (,..--''

    Meow
     
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