# GSM amplifier circuit

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#### amre

Joined Dec 29, 2015
4
Hello
i want to design an amplifier to radiate a 950-1800 mhz signal from my source in 150 meter radius or more than that
i dont know where to start
if any one help me with this ill be very grateful
Thank you

#### RRITESH KAKKAR

Joined Jun 29, 2010
2,829
For what application?

#### amre

Joined Dec 29, 2015
4
well its for jamming circuit that radiate 30 meter maximum
i want a separate circuit that feed from the rf section and amplify the signal so that it cover larger area
Thanks

#### RRITESH KAKKAR

Joined Jun 29, 2010
2,829
Where you want to use it?
Jamming of whose signal?

#### amre

Joined Dec 29, 2015
4
its for studying purpose
what im missing is the gain
its not designed for jamming as its designed for securing specific radius
so 30 meter will be not enough
the BW 925-970 && 1785-1900 MHZ
Those are the frequicy range

#### RRITESH KAKKAR

Joined Jun 29, 2010
2,829
Till now what you have done??

#### amre

Joined Dec 29, 2015
4
ok
the if section is finished which i used 555 timer+ lm386 to lm 741 which is the o/p to the rf section
signal from if go to rf will pass through 2 vco (925-970 vco) & (1785-1900 vco)
the o/p of each vco goes to mosfet then the o/p of each mosfet goes to antenna
or to a separate unit to amplify the signal with its own power supply if it`s possible

#### RRITESH KAKKAR

Joined Jun 29, 2010
2,829
You are using 555 timer at what frequency?
why are you feeding the lm386?
as same why are you using 741 op amp?
Which VCO?

#### bertus

Joined Apr 5, 2008
21,368
Hello,

We do NOT allow jamming devices over here:

Restricted topics. The following topics are regularly raised however are considered "off-topic" at all times and will result in Your thread being closed without question:

• Any kind of over-unity devices and systems
• Devices designed to electrocute or shock another person
• LEDs to mains
• Phone jammers
• Rail guns and high-energy projectile devices
• Transformer-less power supplies
If You come across a thread or post discussing any of the above topics please report the thread so We can close, and if necessary remove, the offending thread/posts.

Bertus

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