Echo had a strange hidden mission-- to be a mirror if EMP messed up the ionosphere. Then the technology on sats improved enough after Telstar was fried..
The Telstar 'fried' story... https://www.scientificamerican.com/article/how-us-accidentally-nuked-own-communications-satellite/
Had a listen for this bird... got a small bleep out of it on an Easterly pass here in VK. Ive tried several times , but seldom hear a bleep. Anyone had success? Im Using an ftm350 yaesu mobile.. I have no issue with SSTV from ISS , or our AO-91 and AO-92. Seems a mistery this one.