This question is inspired by an answer to this question, where it is stated that:
The real power of phased arrays is their ability to be steered electronically.
This set me wondering about the antenna on this satellite, Inmarsat 2 F1
I have been looking online for any description that recognises the antenna as a phased array without luck. However, just looking at the antenna it seems if there is no controlled phase relationship between the horns then at L-band their beams will be so large that most of the power from the antenna will miss the Earth. It appears to me that the horns must all be phase linked so that the effective antenna aperture is the size of the whole satellte Earth face and thus the beam will be much narrower.
Question: Does this count as a phased array or must the beam be electrically steerable once in orbit as well? Was it considered to be a phased array when it was launched back in 1990?
I'm aware some people may think this question is off topic, though I thought I'd start here as I'd be more likely to find someone with specific knowledge of the Inmarsat 2 satellites here.