I have a Home Again pet reader and wish to build an independent circuit that runs on 134 khz and a range to 3 miles to locate a missing pet. Am willing to hire someone as not skilled in radio theory and just need the amplifier. Can anyone help me? Thanks.

 

That will not work, even though you run the signal from the reader through a suitable amplifier and antenna the implant in the pet is unpowered so there is no way to get 3 miles of range from it.

 

First, you would need to power the tag at the distance of 3km. Very unlikely, as you need properly oriented magnetic filed (not electromagnetic) to power it up.
Then comes the second part, getting the response. The tag is designed to modulate the power field. I doubt you would be able to receive the response over that distance, even if you had some alien technology.

 

You would need one huge power source and antenna:

A cell phone tracker is far more practicable, as long as you remember to charge your dog before it goes outside.

If it's a well trained dog and can set up an auto-answer you should be able to call it and tell it to come home.

 

Here is another type of solutiion that has already been worked out:
http://www.youtube.com/watch?v=FZN3JqWT_eI

 

What is the theory for frequency. I found how to amp power to any hz and will give it a throw anyway. Thanks.

 

Can you try it again and this time in English please?