AA87 From United States of America, joined Jun 2005, 140 posts, RR: 0 Posted (9 years 3 days 22 hours ago) and read 2573 times:
Ok, this is not strictly on-topic, but I bought an old American Airlines route map published sometime between 1970-72. Under passenger information, it asks that you refrain from using "portable radios, telephones or televisions" in flight due to possible interference with navigation systems.
Other than senior government officials, and maybe some celebrities/CEOs -- Who was using "portable phones" almost 35 years ago, much less on a commercial airliner ??
Dc863 From Denmark, joined Jun 1999, 1558 posts, RR: 2
Reply 1, posted (9 years 3 days 20 hours ago) and read 2543 times:
Probably just CEO's and gov't officials. A very very rare occurance. My wife who was a SAS stew from early 1969- 1983 never saw anyone with a portable(if you can call it that compare to today's standards) phone.
PipoA380 From Switzerland, joined May 2005, 1594 posts, RR: 51
Reply 3, posted (9 years 3 days 19 hours ago) and read 2528 times:
Quoting PyroGX41487 (Reply 2):
As a question -- just what do portable phones do to aircraft navigation and how was this proven?
Interferce I think. But I don't know if it's been proven. Now Ericsson and Siemens are making equipment to put in the planes so they can use the phone without any interference with low frequency antennas that don't bother the plane.... but the passengers instead!
It's not about AIRBUS. it's not about BOEING. It's all about the beauty of FLYING.
Iakobos From Belgium, joined Aug 2003, 3313 posts, RR: 35
Reply 7, posted (9 years 3 days 12 hours ago) and read 2419 times:
There were no "portable telephones" in '70-'72, at least in the sense we know them today. (wireless telephone)
What did exist at that time however were portable transceivers (contraction of transmitter/receiver), the older version of the walkie-talkie, a two-way AM radio.
The period saw also the transition from "all tube" (vacuum tube or valves) to hybrids (tubes + transistors).
Some (purely radio) networks had the ability to "patch" the radio to the (conventional - wired) telephone network, through a device called "phone patch" or "phone interconnect". It was still two-way, one talks / one listens.
The first such (trans)portable radios were often called "lunchboxes".
Drinkstrolley From , joined Dec 1969, posts, RR:
Reply 8, posted (9 years 3 days 12 hours ago) and read 2418 times:
Quoting PyroGX41487 (Reply 2): As a question -- just what do portable phones do to aircraft navigation and how was this proven?
A mate who installed GSM networks once told me it was a "behind closed doors" deal between the phone companies and the airlines as it screwed up the billing and you ended up getting free calls. Obviously the phone company wouldn't be too keen on this!
Dunno if he was talking rubbish though, but a good theory all the same!!
AeroWeanie From United States of America, joined Dec 2004, 1608 posts, RR: 52
Reply 9, posted (9 years 3 days 10 hours ago) and read 2366 times:
Cell phones have existed since the late 1960s. I remember seeing an article in Popular Science where they tested one in NYC in the early 1970s. There were only two or three cells in existence in NYC at the time and the phone's batteries way a lot. One picture in the article showed the writer sitting in a rubber raft out in the Hudson, speaking on the phone, to show how portable they were.