Ray, some years ago I had a tour through the Parkes Radio Telescope , one of the receiver heads had microwave antenna . I think it was multi layer etched PCB. I wonder if it is similar to the Starlink Phased Array?
Those receiver units that hang at the dish feed point in the Parks Telescope are immersed in nitrogen, this to reduce the thermal noise with in the panel, increasing its sensitivity.
Not sure if the one in the picture above is one of them.
Thanks for the interest I will load a few images of the radio hut . The receiver crane outside on top of the hut, Receivers in the hut ,View down one of the legs etc. Most of the RF gear seemed to be by mini circuits. Yes vacuum and cooling in the rcvr heads
Hi Ray, Last night I looked up Parks Radio Telescope , Lots of images and lots of change since I was there, take a look at the new phased array receiver being hoisted into the hut ,also on the truck in one image seems to be the multi beam receiver which was in place when I climbed into the hut. All the gear is beautifully made .
Great picture, I notice that the dish is dipped right down for the receiver installation, can you remember, does that bring the feed point out over the edge, so that would then be a straight vertical lift from the truck?
Hi Ray. Yes when the dish is tilted over , the winch cable clears the edge of the dish such that a truck can deliver a receiver for instalation ,usually one out then the new one in. The receiver is hoisted right up to the top of the crane on top of the hut , the dish is then placed to a horizontal position, then the receiver is lowered into the hut through the roof hatch . After that there are many hours of work building up the receiver and fitting and testing the support systems , it is high end technology for sure. There is space for two receivers in the hut each looks at different frequency ranges , the chosen unit may be slid/positioned over the aperture for the job in hand. In one image one may observe coiled umbilicals on a tray , that is to allow for horizontal displacement of the receiver when being used or parked. Fantastic engineering the whole thing.