This is certainly a RF jammer manufactured for the U.S. 800 MHz cellular phone band (870-895 MHz).
This functions by developing a massive sweeping RF carrier on the cell phone handset's functioning frequency range.
An Exar XR2206 Multi-purpose Generator will probably work as the triangle wave generator for providing the sweep section of the jammer circuit. The sweep generator should certainly handle a Z-Communications V580MC04 Voltage Controlled Oscillator (VCO) to sweep between about 850-895 MHz at a pace of around 100 kHz.
The VCO is without a doubt the crucial component in a mobile phone jamming method. It's a tad four-terminal gadget (Vcc, RF Output, Voltage Tune, and Ground) which results in the desired low-level RF output signal with a nominal degree of trouble. Unfortunately, VCOs manufactured to cover the meant frequency range we may require my not come easy to acquire. Producers like Mini-Circuits and Z-Communications are extremely in preference of the amateur of electronics enthusiasts, who definitely are willing to offer their VCO products in individually directly or offer you to a close dealer.
The VCO you choose need to include the frequency range of the cellphone base station's downlink wavelengths (tower transmit) which may be needed to be jammed. You frequently make an effort to jam the receiver, therefore because of this, you would probably would like to jam the mobile station's (handset) receive wavelengths - which include the cellphone tower's transmitting frequencies. Each one of these frequencies could possibly be distinct change around the world, never the less the more often than not method will constantly be the same.
A few 5 kohm multiturn potentiometers are set to found a predetermined DC offset for the VCO's voltage control line. Exactly what this implement is enable the sweeping triangle wave a positive DC voltage offset to help "center" the sweeping triangle wave within the preferred jamming frequency spectrum. The amplitude of the triangle wave matches in harmony the frequency width of the jamming spectrum. Here's a opinion which utilizes a regular VCO:
In our above discussion, a standard VCO has the power of tuning between 790-910 MHz with a voltage tune from 0 to +6 VDC. This seems to around 20 MHz of tune/volt. per volt. Which implies, in case you had the wish to "jam" the frequency ranges between 870-890 MHz, it might necessaite a +1 volt peak-to-peak triangle wave with a DC offset of +4 volts. This could possibly be a voltage signal sweeping between +4 and +5 VDC (referenced from ground), along with might sweep the VCO's RF output between 870-890 MHz. As that being said,, in almost, the voltage-to-frequency mappings are not this exactly essential..
An added crucial part of the RF jammer sequence is the conclude stage RF power amplifier. Perhaps this is regarded as a a stage which isolates a mini RF input signal, say for instance at +10 dBm (10 milliwatts), and promotes it as much as around +36 dBm (4 watts) and further. The an easy task to get source of such amplifiers is from certain abandoned analog cellphones itself. Certain unused old cellphones (Motorola, Nokia, Uniden, etc.) may perhaps utilize a broadband RF power "hybrid" module which allows to render their construction much peaceful and scales-down.
These kinds of RF module equipment are extremely wideband with regards to frequeny, and is manufactured to perfectly enhance RF signals lying beyond their specific range. improving the module's RF power control bias (Vapc) or Vdd voltage may furthermore remove even more benefit from these, but may also #blank# influence the anticipated life duration of the power module. The RF power module may have to be connected with an important, and well polished heatsink and might necessiatate a cooling fan on higher power amplifiers.
To be able to finalized this project, we are going to depend on a Hitachi PF0030 820-850 MHz RF power amplifier module recovered from an utilized or thrown away CT-1055 Radio Shack/Nokia cellphone. Such standard products are allocated to over 900 MHz with just a minimal reduction in gain at those upper frequency rages.. Making use of the Vdd voltage at +15 to +17 VDC may possibly slightly increase the available RF power output. I've pulled these to achieve up to 10+ watts output under correctly layed out and set with a significant heatsink, in spite of this it's usually not using the dangerous circumstance. Press upon keeping the optimal RF output power around 5 to 8 watts.
An affordable amount broadband RF power hybrid boards seldom take advantage of more than +13 dBm (20 mW) of RF input to run as meant to be.. It may be quite right being powerred staright from the VCO's RF output not requiring any extra RF pre-amplification stage. Enhancing the RF input power may possibly only tend to impact the life duration of the power module and likely give a nominal stress on the output gain.
The essential area of any radio method might be the antenna. Throw ample amount of money on the antenna part (and coaxial cable), and you can expect to minimal problems on your way. Depend on a coathanger and a couple of alligator clips and you are going to be wishing to get in touch with me countless occasions a day complaining that it doesn't work.
In spite of this the positive thing is, you might well search out a moderately good antenna from (possibly) junked analog cellphone. Those magnetic or trunk installed antennas turn out to be appropriate the best. Glass-mount antennas or some thing like that "stick-on" are traditionally a nuisance. Directional gain (Yagi) antennas can also be attempted to improve the jammer's working range, nevertheless for just in the area the antenna is instructed. High-gain, omni-directional antennas might be regarded extremely profitable for the majority of RF jamming implementations. For homebrew prototypes, you might believe scaling down (or up) 900 MHz band amateur radio band antennas.
Below proven is the voltage-to-frequency mapping of Z-Comm V580MC04 VCO. The RF output power was around +8 dBm over the full frequency spectrum.
The following figure demonstrates a summary of an old Radio Shack CT-1055 (Cat No. 17-1007A) 800 MHz band analog cellular phone.
You can observe the occurrence of the Hitachi PF0030 RF power amplifier IC module installed over a heatsink, and sufficient heatsink compound utilized relating to the device and the heatsink. In the mentioned prototype the whole IC in addition to the heatsink was salvaged.
Unless you happen to possess such an alanogue cellphone circuit with you, you can purchase it brand new from the market, the pinout information of the same might be observed below:
The following image represents an overview of the finished 800 MHz Cellular Phone Jammer unit
An alternate of the above might be observed below:
Finalized circuit diagram of the above described cellphone jammer:
10V regulated power supply for the above cellphone jammer stages
This functions by developing a massive sweeping RF carrier on the cell phone handset's functioning frequency range.
An Exar XR2206 Multi-purpose Generator will probably work as the triangle wave generator for providing the sweep section of the jammer circuit. The sweep generator should certainly handle a Z-Communications V580MC04 Voltage Controlled Oscillator (VCO) to sweep between about 850-895 MHz at a pace of around 100 kHz.
The VCO is without a doubt the crucial component in a mobile phone jamming method. It's a tad four-terminal gadget (Vcc, RF Output, Voltage Tune, and Ground) which results in the desired low-level RF output signal with a nominal degree of trouble. Unfortunately, VCOs manufactured to cover the meant frequency range we may require my not come easy to acquire. Producers like Mini-Circuits and Z-Communications are extremely in preference of the amateur of electronics enthusiasts, who definitely are willing to offer their VCO products in individually directly or offer you to a close dealer.
The VCO you choose need to include the frequency range of the cellphone base station's downlink wavelengths (tower transmit) which may be needed to be jammed. You frequently make an effort to jam the receiver, therefore because of this, you would probably would like to jam the mobile station's (handset) receive wavelengths - which include the cellphone tower's transmitting frequencies. Each one of these frequencies could possibly be distinct change around the world, never the less the more often than not method will constantly be the same.
A few 5 kohm multiturn potentiometers are set to found a predetermined DC offset for the VCO's voltage control line. Exactly what this implement is enable the sweeping triangle wave a positive DC voltage offset to help "center" the sweeping triangle wave within the preferred jamming frequency spectrum. The amplitude of the triangle wave matches in harmony the frequency width of the jamming spectrum. Here's a opinion which utilizes a regular VCO:
In our above discussion, a standard VCO has the power of tuning between 790-910 MHz with a voltage tune from 0 to +6 VDC. This seems to around 20 MHz of tune/volt. per volt. Which implies, in case you had the wish to "jam" the frequency ranges between 870-890 MHz, it might necessaite a +1 volt peak-to-peak triangle wave with a DC offset of +4 volts. This could possibly be a voltage signal sweeping between +4 and +5 VDC (referenced from ground), along with might sweep the VCO's RF output between 870-890 MHz. As that being said,, in almost, the voltage-to-frequency mappings are not this exactly essential..
An added crucial part of the RF jammer sequence is the conclude stage RF power amplifier. Perhaps this is regarded as a a stage which isolates a mini RF input signal, say for instance at +10 dBm (10 milliwatts), and promotes it as much as around +36 dBm (4 watts) and further. The an easy task to get source of such amplifiers is from certain abandoned analog cellphones itself. Certain unused old cellphones (Motorola, Nokia, Uniden, etc.) may perhaps utilize a broadband RF power "hybrid" module which allows to render their construction much peaceful and scales-down.
These kinds of RF module equipment are extremely wideband with regards to frequeny, and is manufactured to perfectly enhance RF signals lying beyond their specific range. improving the module's RF power control bias (Vapc) or Vdd voltage may furthermore remove even more benefit from these, but may also #blank# influence the anticipated life duration of the power module. The RF power module may have to be connected with an important, and well polished heatsink and might necessiatate a cooling fan on higher power amplifiers.
To be able to finalized this project, we are going to depend on a Hitachi PF0030 820-850 MHz RF power amplifier module recovered from an utilized or thrown away CT-1055 Radio Shack/Nokia cellphone. Such standard products are allocated to over 900 MHz with just a minimal reduction in gain at those upper frequency rages.. Making use of the Vdd voltage at +15 to +17 VDC may possibly slightly increase the available RF power output. I've pulled these to achieve up to 10+ watts output under correctly layed out and set with a significant heatsink, in spite of this it's usually not using the dangerous circumstance. Press upon keeping the optimal RF output power around 5 to 8 watts.
An affordable amount broadband RF power hybrid boards seldom take advantage of more than +13 dBm (20 mW) of RF input to run as meant to be.. It may be quite right being powerred staright from the VCO's RF output not requiring any extra RF pre-amplification stage. Enhancing the RF input power may possibly only tend to impact the life duration of the power module and likely give a nominal stress on the output gain.
The essential area of any radio method might be the antenna. Throw ample amount of money on the antenna part (and coaxial cable), and you can expect to minimal problems on your way. Depend on a coathanger and a couple of alligator clips and you are going to be wishing to get in touch with me countless occasions a day complaining that it doesn't work.
In spite of this the positive thing is, you might well search out a moderately good antenna from (possibly) junked analog cellphone. Those magnetic or trunk installed antennas turn out to be appropriate the best. Glass-mount antennas or some thing like that "stick-on" are traditionally a nuisance. Directional gain (Yagi) antennas can also be attempted to improve the jammer's working range, nevertheless for just in the area the antenna is instructed. High-gain, omni-directional antennas might be regarded extremely profitable for the majority of RF jamming implementations. For homebrew prototypes, you might believe scaling down (or up) 900 MHz band amateur radio band antennas.
Below proven is the voltage-to-frequency mapping of Z-Comm V580MC04 VCO. The RF output power was around +8 dBm over the full frequency spectrum.
The following figure demonstrates a summary of an old Radio Shack CT-1055 (Cat No. 17-1007A) 800 MHz band analog cellular phone.
You can observe the occurrence of the Hitachi PF0030 RF power amplifier IC module installed over a heatsink, and sufficient heatsink compound utilized relating to the device and the heatsink. In the mentioned prototype the whole IC in addition to the heatsink was salvaged.
Unless you happen to possess such an alanogue cellphone circuit with you, you can purchase it brand new from the market, the pinout information of the same might be observed below:
The following image represents an overview of the finished 800 MHz Cellular Phone Jammer unit
An alternate of the above might be observed below:
10V regulated power supply for the above cellphone jammer stages
No comments:
Post a Comment