SparkFun Forums

[marcusbarnet]

Hi to all,

I'd like to ask you if I can use a RF Link Transmitter like this one http://www.sparkfun.com/products/10534 like a hidden dog fence.

I mean: can I connect a long wire to the Antenna pin and use it to mark a particular area borders like hidden dog fences do?

In this way, I can use a RF Link receiver on my mobile robot in order to detect the RF field and change its path according to the signal strenght.

[stevech]

no, the wire would be far too long.

[marcusbarnet]

Thanks for your answer.

So, how the hidden dog fence work?

The closed loop wire used by this kind of fence, is not a long antenna?

What kind of devices should I use to build something like that?

[stevech]

low frequency - where wavelength is quite long. Perhaps less than 100KHz.

[marcusbarnet]

Where can I get more info about this kind of devices?

I'd like to study how dog fence system work in order to know how to build a circuit with the same features.

I searched on google for schematics or theory but I've found nothing

[Philba]

I think these systems use inductive coupling. Probably via a resonant coil in the receiver. I did a little googling and was surprised that there was very little technical info on these kind of devices.

[marcusbarnet]

Yep, there is no documentation about this stuff and I do not know the reason!

I'm very interested in this kind of devices and I would like to found someone which can help me to better understand..