I've found myself playing with amateur radio in my observatory because of all the cloudy nights in Southern California over the last year. In fact it has been so horrible for the last several months. So while having no images to process, I have started working with the software defined ration (http://www.rtl-sdr.com/) - an incredibly inexpensive device which receives from about 30MHz to over 1 GHz. After I get my license I will be getting a proper rig for transmitting.
So my question is, is there any other Observatories which are outfitted with amateur radio and do you chat with other observatories/astrophotographers over the air waves?