Just for the heck of it , I did a little internet check on Arecibo and found
the following info;
""Full operation of the facility ideally requires three frequency bands,
near 3.175, 5.1, and 8.175 mhz."

Harold
KD5SAK

i don't understand what this means? that they mix these freq's to get
their usual super high seti freq xxxghz or what ever