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

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 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


 
   
 
 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.





Posted  11/12/2012
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