need a Circuit for Finding out a hidden RF transmitter !

[firoz3321]

rf direction finder

Hello to every one,

I need a Circuit for Finding out a hidden RF transmitter. Can some one sugges me any idea please ?
A RF Transmitter of a fixed Frequency will be hidden some where around, And I'am Supposed to find the transmitter. This is a project competition held here. Please Help.

Thank U

 

[fsmyth]

A spectrum analyzer would be nice.
Lacking that, try one of:
**broken link removed**
<als>

 

[bend wh0nx]

nah,,,u'll need a rf direction finder,,,,i will just tell u the direction but not the exact position,,,

 

[House_Cat]

I need a Circuit for Finding out a hidden RF transmitter. Can some one sugges me any idea please ?
A RF Transmitter of a fixed Frequency will be hidden some where around, And I'am Supposed to find the transmitter.

Do you know the frequency and modulatioin type (CW, AM, FM...)? If so, all you need to do is build a receiver with a shielded loop directional antenna. Depending on the frequency, you might even be able to use a common portable entertainment receiver with an external directional antenna. If you add a signal strength indicator, any directional ambiguity would be eliminated by simply observing the signal strength as you move a few steps away or toward suspected signal direction.

Radio Amatures (Hams) call this sort of thing "Fox Hunting". You might get some ideas by doing a Google search for "Ham Fox Hunting". You could also look for "radio direction finder schematic".

A few schematics I found were:
https://members.tripod.com/~clearRX/RDFUNIT.HTM
**broken link removed**
https://www.mkdw.net/pub/radio/Books/N0GSG DSP Radio Direction Finder.pdf
**broken link removed**
https://www.handi-finder.com/

 

[firoz3321]

The specifications are:

* Transmitting frequency is 144MHz.
* Aerial radius of the antenna is 1km with a transmitting power of 0.5-1 W (approx)



and thank You for the responses.....