just thinking out loud here (and may have been done before, if it has, links would be appreciated !)

I come across noise RFI, EMI etc... throughtout my day at work.

now we hav RF detectors that are used to sniff out suspect electrical devices, but I was thinking, one could be built easily enough ?

the bandwidth would be broad, 0ish - 30 Mhz

the ones that we use in work, you walk around and anything giving off RF it gives off a squeeling sound the closer you get to it ...

now I know a normal SW radio would suffice, but I found on some occasions, with a radios good filtering, unless you were around the suspect frequencies, the source is hard to detect and localise ....

I suppose a cheap SW radio with really bad filtering would be an idea,

but, anyone any other ideas ?

 

I ran across this site:

http://www.rcgroups.com/forums/showthread.php?t=1557232

I just skimmed it and not sure I believe him, but you might find some ideas there.

 

Hello,

The AD8307 is a RF detector chip.
Here is the datasheet for more info:
http://www.box73.de/download/bauelemente/6307.pdf

Bertus

 

cheers people ...

on a side note (but something that might be of use to the circuit)

we all know the basic tuned circuit AM radio .... any ideas on how to make that tuned circuit very wideband ?

 

Hello,

Perhaps the PDF's mentioned on this page might help:
http://217.34.103.131/pages/app_notes.html

Bertus

 

Not sure if this falls into your catagory but an old electrician told me to find a short in a wire behind a wall or in a building to use an AM radio on a certain frequency. When it finds the short it will squeal. Sounded similar. I had never heard that and the guy was like 80.