On Oct 15 2009, Rocky Jones wrote:
http://spaceflightnow.com/news/n0910/15dscovr/index.html
Robert WB5MZO
Hmmm... from the article cited: "designed to keep a constant vigil on the planet from the L1 libration point a million miles away"
Gee, that's about 11 seconds for your echo to return, assuming you have enough power, antenna gain, and receive capability to even hear an echo... It would be quite a challenge to work. Certainly different than working a LEO, anyway! I guess for those who want to try something "really different", that would qualify. :)
But the point of the article was that NASA was struggling to find the funds to launch the thing, so I don't see much point in speculating if we could attach a transponder to it. :(
73 de W0JT