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400 meter radio bug

March 31, 2012 Electronics / Bugs for wiretapping 233 799 29

Today on the Internet you can find many schemes of radio transmitters. For many months, almost half of them were repeated, but not a single circuit showed the required parameters. Long-range schemes were encountered, but stability left much to be desired. Stable circuits, in turn, had a range of not more than 100 meters. As a result, it was decided to assemble your own circuit.

Within a few days after a careful selection of radio components, a scheme for a completely new radio beetle was created. Thanks to the applied high-frequency amplifier (UHF), it was possible to increase the range of the device to 400 meters. I did the tests with the Nokia N95 mobile phone receiver, a decrease or increase in the frequency is observed, but only by 0.5 fm! The power of the radio bug is about half a watt, tests were also conducted with a double UHF, the range went over a kilometer, the LED in the antenna circuit freely turned on. Jamming of several television channels at a distance of 50 meters from the TV was also noticed. I want to note that the TV channels went down completely, only the blue screen! Let's get back to our radio transmitter.

Microwave transistors of the kt325v type were used in the transmitter and high-frequency amplifier, the cutoff frequency of these transistors is more than 1 gigahertz (1000 megahertz). The microphone took an electronic one, from a Chinese tape recorder, pick up a microphone with great sensitivity. In the photos there is a beetle layout, later it will be transferred to the board, but in smd version. The circuit contains 6 turns of wire with a diameter of 1.2 mm, wound on a frame with a diameter of 8 mm. To configure the beetle, I advise you to use the simplest pointer RF detector. With this detector, you can configure any bug in 5 minutes.

Using a variable capacitor, you can tune the transmitter to any desired frequency in the fm limit. If desired, you can increase the number of turns of the circuit to 9 - and then the transmitter will work in the range of am. My beetle caught at a frequency of 95 megahertz, although the beetle perfectly transmitted a signal in the band 94 - 96 megahertz (fm). It is convenient to use Chinese receivers, or a mobile phone receiver. Unlike other bugs, this one is excellently caught on digital technology. The range, as already mentioned, is 400 meters of “honest” ones.

This range was obtained with direct visibility in the city. The microphone sensitivity is about 4 - 5 meters, the transmitter freely covers one room, even a whisper is heard. The antenna is a piece of wire with a length of 40 cm, powered by a 9-volt crown.

come back

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Comments (29)

#1 alex Guests March 31, 2012 21:08
3

transistor in the middle of the circuit which index has?
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#2 feelloff Guests April 1, 2012 10:51
4

[b] alex [/ b], it doesn’t matter.
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#3 alex Guests April 11, 2012 14:03
1

and one more question what does 100L, 330L mean?
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#4 AKA Guests May 20, 2012 23:10
4

KT 325 V or any RF or microwave with a cut-off frequency above 900 megahertz
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#5 Macsavko Guests July 13, 2012 00:08
1

I collected a bug according to this scheme. The trans is heated in the generator. That is how it should be?
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#6 Macsavko Guests July 13, 2012 00:13
2

KT315 and KT325B used transistors instead of B - I did not find it in the city.
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#7 Macsavko Guests July 13, 2012 18:46
1

It catches me about 10 meters. What is the reason?
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#8 bob Guests September 17, 2012 10:54
5

lay out a double UHF circuit whose range has passed over a kilometer
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#9 bob Guests September 17, 2012 10:58
1

transistor in the second stage of what brand. 325 too?
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#10 bob Guests September 17, 2012 15:23
1

finally can not catch there is a crack in the receiver
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#11 bob Guests September 17, 2012 15:42
0

you have 2 cascades in one photo and 3 cascades in another ... do you even sign what kind of worker and what signal strength they are assembled. the photo cannot be fully disassembled and finally lay out the list of details
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#12 yaro17 Guests January 21, 2013 15:34
5

but you can buy such a thing from the author
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#13 Sergey Guests April 22, 2013 19:25
1

Well, what about the details .. what you need .. the photos are all different .. nothing is clear?
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#14 giin Guests May 1, 2013 02:03
4

what are you doing on this canoe ..)))) "power is half a watt" ...))) where you saw so that power could be squeezed out of the crown, even according to children's calculations it does not have enough current ... the generator with one transyuk is tight pulls well a maximum of 50 MW output. Freebies DO NOT HAPPEN! you have to pay for everything, either by the complexity of the assembly or the power supply. like that ...
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#15 Egor Guests November 14, 2013 19:42
2

You can write the designation of each element in the diagram, otherwise I didn’t figure it out and the thing is cool
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#16 Andrei Guests July 24, 2014 9:16 p.m.
0

installation reminds children in a sandbox.
indeed, to be pulled by 400m you need a powerful RF or microwave transistor, and the one that is in the circuit is a low-power transistor.
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#17 Michael Guests October 21, 2014 00:19
0

Ahah, I’m a 2222a transistor and s9014, and everything went, though, as Andrei wrote, it doesn’t roll 400 meters, but it catches 30-50 meters))
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#18 Denis Guests March 9, 2015 14:22
7

In my opinion, it’s easier to buy a flawed phone for a hundred, stick a sensitive microphone, an unnecessary SIM card and set it to answer automatically. The tariff is super pay and here you have a free bug working at any distance))
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1. #19 ivan Visitors October 1, 2018 8:19 p.m.
  0
  
  you still have to pay for the tariff .... I propose a way when no chips are needed at all. You can listen to it simply using a cell phone with the Internet + bluetooth headphones. Download the application * spy ear * ... launch the application and then place the cell phone on a sufficiently secretive place and next to the object of wiretapping ..... and then we begin to listen to the headphones through the bluetooth within 10 meters
  
  To answer
#20 Fedor Guests April 26, 2015 23:25
1

Quote: giin
what are you doing on this canoe ..)))) "power is half a watt" ...))) where you saw so that power could be squeezed out of the crown, even according to children's calculations it does not have enough current ... the generator with one transyuk is tight pulls well a maximum of 50 MW output. Freebies DO NOT HAPPEN! you have to pay for everything, either by the complexity of the assembly or the power supply. like that ...

collected differently the radius of 5km prvda the transistor heats up the range 430MHz
- To answer
#21 Sergey Guests July 22, 2015 16:43
1

working scheme, it all worked out the first time. radius tried 200m works clearly, thanks for the scheme. By the way, the cost of all parts came to me about 25 UAH
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#22 Alex Guests April 15, 2016 16:53
1

So for the gifted, KT325 has a round shape, a metal case. Campaign author breeds people
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#23 Zett_Roman Guests July 17, 2016 18:13
0

and use lithium or salted crowns?
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#24 vasek Guests 7 january 2017 14:27
1

[b] giin [/ b],
guys this is not nonsense. I have a friend about 9 years ago here with such a thing a radio wave of 1,500 meters in the village the radio organized and by the way, also on the crown
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#25 Jack Guests April 9, 2017 11:48
3

[b] notches [/ b],
Do not block this cheater, according to the scheme drawn on a piece of paper, it turns out that there should be 3 (!!!!) transistors, whereas, if you look closely, there are 2 of them in the author’s assembly.
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#26 Nick Guests April 12, 2017 01:04
0

[b] alex [/ b],
The second transistor in the circuit can be taken KT368 or the same as the third.
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#27 Nikita Nevedrov Guests January 5, 2018 00:41
1

assembled this circuit
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#28 Nikita Nevedrov Guests January 5, 2018 00:47
2

After assembling the beetle, the distance was 10 meters (the circuit was with UHF) microphone sensitivity 5-8m.
In order to configure the bug you need a UHF detector !!!
- To answer
#29 ivan Visitors October 1, 2018 19:48
0

Friends, I suggest a way when no chips are needed at all. You can listen to it simply using a cell phone with the Internet + bluetooth headphones. Download the application * spy ear * ... launch the application and then place the cell phone on a sufficiently secretive place and next to the object of the wiretapping place ..... and then we begin to listen to the headphones through the bluetooth within 10 meters
- To answer