Giday from Down under

Hi I need to make an Rxer that has 4 aerials and can detect which aerial has the stronger signal.
The 433 Rxer PCB you guys are talking about is good but i want this to looking at all 4 aerials and tell the operator which direction the signal is comming from.
I was thinking of diode detectors with LEDs on each output.
Any one got better ideas

Allen

 

It strikes me that this approach is not going to work. For instance, if four antennae are on a vehicle roof, they will all receive a very similar signal level. Where differences in signal strength occur, this will be the result of many factors, a very minor one being the metre or so distance differential in direct propagation path length.
Here in the Mothercountry, we have police cars which give the bearing of a VHF tracking beacon on a stolen car. These don't work on signal strength though, instead, they examine the phase relationship of each of the four signals.

 

Gday from "up over!

What you want to build is called a diversity receiver, and it requires a separate detector (such as AGC) for each antenna. A simple analog "voting circuit" can then route the strongest signal to the audio stage or digital decoder. Very cool methodology and very effective for lousy conditions, by the way.

Look up Internet references for "diversity reception" for more details.

Good luck!

Eric