Need a small, light, low power beacon transmitter

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Hello, i need a very small, light, low power (working at 1.5v battery)
beacon for an transmitter that i can receve with a common AM/FM/LW
portable radio. I intend to use it to locate my dog (is a small
chiwawa). I live near a forrest and my dog is keep dissapearing in the
woods ). I've tryed this sites but i cannot find some of the
components (like a xtal FM type) and on the other site is seems to
easy to be true (and i cannot understand on what frequency works).

Thanks ...

http://www.jbgizmo.com/page4.html
http://www.uoguelph.ca/~antoon/circ/archive/rft1.htm