I was sending not very high powered pulse signals at the time and observing response signals. The signals were automated with gnuradio. Callsign was part of my

I was sending not very high powered pulse signals at the time and observing response signals. The signals were automated with gnuradio. Callsign was part of my automated sequence, sent periodically. Now, most of the work done with radio telescopes are passive, but they are really just large dishes capable of receiving any radio signal, including ham stuff.