No, the receivers were capable of 10GHz.

  3 cm (10.0 GHz)–1 m (300 MHz)

See my other comment (Wikipedia article) for the transmitters' ranges.

https://en.wikipedia.org/wiki/Arecibo_Telescope

Thanks, I assumed transmit matched receive.

While we are being helpful clarifying details perhaps to you could mention something about the difference between the wattage of the power supply used and the Terra watt figure arrived at when switching to EIRP.

As a newish ham I have at least seen the jargon but I fear many of out dear readers may be envisioning nuclear powered death rays with those numbers.