News2 mins ago
How Come
That 50 yrs ago, we could have a (clear) conversation with someone almost a quarter of a million miles away on the moon with no problem and yet in this day and age with advanced technology, (mobile phones etc), we cant get a signal from a few miles away if we are in a certain spot?
How can we communicate through vast distances, space, the Van Hellen Belt etc but cant get a signal for a phone if we are in the country side? We havnt mastered communication around the globe yet so how come we mastered communication to the moon 50 yrs ago when we didnt even have mobiles????
Don't get it.
How can we communicate through vast distances, space, the Van Hellen Belt etc but cant get a signal for a phone if we are in the country side? We havnt mastered communication around the globe yet so how come we mastered communication to the moon 50 yrs ago when we didnt even have mobiles????
Don't get it.
Answers
you're not comparing like with like. Most mobile phones rely on the positioning of masts for access to the network. In effect a mobile phone is local communicatio n device. Masts are in most places but there are still places where they are not. Earth communicatio n to things like mars probes etc are via powerful x band microwave transmission . Back in 1969 they...
12:34 Sat 22nd Jun 2019
Communication with spacecraft uses different technology to our mobile phones.
https:/ /en.wik ipedia. org/wik i/Groun d_segme nt
https:/
Communications from the Moon used a directional antenna pointed directly at the Earth being received by an antenna pointed directly at the Moon.
Voyager space craft have the same arrangements and are still communicating from tens of billions of kilometres away. The signal arrives here with a power of one-tenth of a billion-trillionth of a Watt. A fly fart would be more powerful.
Voyager space craft have the same arrangements and are still communicating from tens of billions of kilometres away. The signal arrives here with a power of one-tenth of a billion-trillionth of a Watt. A fly fart would be more powerful.
you're not comparing like with like. Most mobile phones rely on the positioning of masts for access to the network. In effect a mobile phone is local communication device. Masts are in most places but there are still places where they are not. Earth communication to things like mars probes etc are via powerful x band microwave transmission. Back in 1969 they would have used VHF direct transmitters/receives aimed correctly.