Avalanche beacon 457Khz transreciever

[A2]

I am embedded engineer & have to experience of wireless communication sytems. I have to make avalance beacon for 457Khz.

I was looking for ready made products but they are very expensive go upto $300.

I am looking for some less expensive. I didn't find any circuit for it on internet.
Any help
I have to also find position & direction, it includes embedded programming, that I can handle.

[Zero999]

It's probably expensive because they're safety critical and need to work over a wide temperature range and high humidity. Just buy a good quality one, then at least you can be sure it'll work and comply with the relevant standards.

For educational purposes, here's what I found from Google search:
https://s3.amazonaws.com/BackcountryAccess/content/papers/457andFuture_000.pdf
http://arc.lib.montana.edu/snow-science/objects/ISSW-1984-048-053.pdf