|
Some interesting concepts here.
If we go back 50 years (1960's) portable comunication was by radio but we as ham operators were using repeaters that gave us very wide range.
But don't forget walky-talkies were used during WW2(70 years ago)
40 years (1970's) we had GPS (transit satellites). Packet radio was being developed which became cell phones. The sci fi from the 1960's would have known about the develpment of these and some would have forecast what we have today.
Barry
|