Custom Search
Over 9,000 pages indexed!
Your Host
Click here to read about RF CafeKirt
Blattenberger
... single-handedly
redefining what an
engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding business website - lots of info

Doggy Dynasty:
My son-in-law's dog training business
•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<
Job Board
About RF Cafe©
RF Cafe E-Mail
Product & Service
Directory		 Engineering
Jobs
Personally Selected
Manufacturers		 Employers Only
(no recruiters)
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.


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.





Posted  11/12/2012

RF Cafe Software

RF Cascade Workbook
 RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

Smith Chart™ for Excel
Smith Chart™ for Visio
RF & EE Symbols Word
RF Stencils for Visio
A Disruptive Web Presence™

Custom Search
Over 9,000 pages indexed!
 Read About RF Cafe
Webmaster: Kirt Blattenberger
KB3UON

Product & Service Directory
Personally Selected Manufacturers

 RF Cafe T-Shirts & Mugs
Calculator Workbook
RF Workbench
Please Support My Advertisers