While researching a DIY digital video streaming solution for an outdoor quad-rotor project, I've noticed that a lot of the popular digital transceivers seem to be limited to 63mW transmit power:
(sorry, newbs can't post too many links)
My original guess was that it was a legislation issue, but the last module (that operates on 900MHz unlike the other 2.4GHz ones) has the following message in the datasheet:
Selectable 1, 10, 63, 250, 500 or 1000 mW transmit power with a firmware interlock of 63 mW maximum for 500 kb/s operation
That would suggest that something in the underlying physics breaks down above 63 mW for high bitrates. Is that the case, or is it just a combination of coincidence and poorly written datasheets (the third module is rated for 63 mW on its datasheet, but 100 mW on its specs page)?.
I'm an established programmer with a decent understanding of physics (albeit I'll admit to skipping quite a few electrical engineering classes) so as long as you keep it below line integrals and wave functions (the quantum type), I should be able to follow.