- Jan 1, 1970
Don't bet on it, since I built the reievers used for radio
For which observatory and wavelengths? Front end or IF stage?
Most of them have in significant house capability for design of the main
amplifier and correlator electronics. They tend to use mass produced
dishes and then add custom interchangeable front ends.
We did aperture synthesis in permitted bands from 151MHz up to 31GHz.
There were tube based power oscilators in the '40s that would drive a
syncronous motor, and could be crystal controlled, so it's taken you 70
years to get it right?
I already told you synchronous motors got phased out around the 60's and
70's in favour of steppers. But computer controlled servos and before
that in some sites paper tape controlled tracking was used.