Lin,
Some time back I picked up a pair of Gemini G3 Dataradios on ebay,
hoping to be able to use them. I quickly learned they really cannot
be used point to point, and you need the expensive base station to act
as a controller between them.
I swear I have read that some models of the radios are capable of
point to point/ peer to peer use. Do you or anyone else know which
models would be good candidates for such a thing?
I ended up giving them to a friend who documented them the best he could:
http://www.qsl.net/n9zia/gemini/index.html