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Building a Mobile Signal detector for my project - RF Cafe Forums

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Sin_Eater
 Post subject: Building a Mobile Signal detector for my project
Posted: Tue Apr 06, 2010 11:17 am 
 
Lieutenant

Joined: Tue Apr 06, 2010 11:09 am

Posts: 1

Hi there,

I am building a mobile signal detector which will use spread spectrum to pick up signals. It will detect GSM and 3G signals. I could really use a starting point here and any guidance in this would be highly appreciated.

Many Thanks,

Sin_Eater
 
   
 
Cube Slave
 Post subject: Re: Building a Mobile Signal detector for my project
Posted: Mon Sep 20, 2010 10:07 am 
 
Captain
User avatar

Joined: Tue Jun 06, 2006 10:10 am

Posts: 16

If all you want to do is detect the presence of the signals, you could build a wideband detector circuit for the bands of interest, then do a little amplification into a threshold detector (comparator opamp circuit. The entire circuit could probably be built from scrap box parts. The antenna(s) could be simple 1/4-wave monopole.

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