Communications aboard. We can have very fast internet why dont

trouville

trouville

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Why isnt fast internet used on board? Ive been wondering for years??

When we want to connect to the internet we often connect using wi-fi which is sent by a modem on 2.4 GHz.

Why then dosnt anyone take the 802.11b/g and transmit the signal at say 30w on 14300MHz???Or on another frequency depending where the internet connections based???

I just cant understand why its stuck at 2.4GHz ?????
 
There are international conventions and agreements on frequency usage. For instance 14GHz is used for TV DBS downlinks and you wouldn't want some terrestrial internet signal interrupting you watching East Enders on BBC Prime would you ?????
 
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There are international conventions and agreements on frequency usage. For instance 14GHz is used for TV DBS downlinks and you wouldn't want some terrestrial internet signal interrupting you watching East Enders on BBC Prime would you ?????


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14 MEGAHz not GHz I have the frequency allocation list why not put the 802.11b/g on a data frequency?

Eastenders?? Ive seen that once some time ago its dreadful!We have a DVD which has an ad for eastenders the DVD went overboard!(and sank)TVs just junk!I think if i had the choise of a data link or TV id disrupt the TV Whatching TVs a compleat waist of time!Ive watched CNN mostly advertiseing and endless mindless repeats!

Smoking tobbacco and TV are the two worst things you can do!
 
There are international conventions and agreements on frequency usage. For instance 14GHz is used for TV DBS downlinks and you wouldn't want some terrestrial internet signal interrupting you watching East Enders on BBC Prime would you ?????

errr YES!
 
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Why then dosnt anyone take the 802.11b/g and transmit the signal at say 30w on 14300MHz???Or on another frequency depending where the internet connections based???

[/ QUOTE ]Do you mean 14300MHz (ie 14.3GHz) or do you mean 14.3MHz (as you say in a later post)? If the latter then wouldn't there be a problem with bandwidth? I don't know what bandwidth each 802.11g channel requires but it must be fairly wide to accomodate the 54Mbit datarate.
Also, don't forget the traffic is duplex - so you would need a tx/rx at both ends of your 14.3MHz (or GHz) link.
 
To transmit 54Mb/s you dont actually need all that bandwidth; there are clever modulation schemes (e.g. 8PSK/AM) which mean you only transmit something like 3Mb/s [with no coding].

But without getting too technical there are a lot of users out there and these things are regulated and planned decades in advance, and frequencies are allocated for various uses. The better way to overcome the "low" data rates is to use more efficient modulation schemes, but this takes time to put into effect; design changes, production, the introduction of the new technology alongside the old and then the transfer to the new system ........ these are not things that you can do autonomously overnight!

P.S. I was only joking about Eastenders !!!!!

But I agree with you Trouville, I would love to have faster data rates, I was only pointing out that frequency usage is regulated internationally.

Alan.
 
Im useing up to 33kbps mostly!

I read that in the USA their useing 802.11b on 14MHz experimentaly,now just waiting for permision.

Is there any reason other than regulations why its not in use now?

Theres lots of experimental data systems that would provide internet aboard at far faster rates than pactor3 & far less costly

Dont worry about eastenders!I havent had a TV almost ever!In 1994 i bought a 12v colour TV from the casino in Bastia & it blew up when i mixed up the 12v with 240v id just installed from an inverter,i hadent marked the plug 240v!

I couldent get the pcb out without cracking it the fuse was unaccessable.Since then the only TV is watched in cafès or when visiting even then mostly i watch DVD if at all!Before that i had a small german LCD TV i bought in 1992 that wasent compatable with French TV!

In Elba it worked though there there was so much to do i never missed tv Football was easy as everyone has a set on even boats running generators just for the TV!!!

Is there any reason i couldent try 802.11 or would you recomend a better data system that might be used later???
 
14 mc/s is a ham radio frequency, and I guess (I dont know) what you have read about is a trial to use digital transmissions on the ham bands. certainly 30w on 14mc/s would be capable of being received across the atlantic on a good day. and if you think east enders is grim chav TV, you want to watch US tv!

There are a miriad uses of the radio frequencies, and since radio waves dont recognise national boundaries these uses are internationally controlled. There is a shortage of bandwidth so its likely over the coming years that a lot more analogue signals have to change to digital just as is happening with UK tv.
 
It would surely be a disaster? The low power UHF signals have a range of just yards so you can have millions of them on the planet. But how would it work if they had ranges of 1,000's of miles? Each connection would require a dedicated time/frequency slice and the entire frequency allocation would vanish. Hams already moan about inconsiderate Pactor users stamping all over their low power data comms.
 
Not all pactor uses are inconsiderate /forums/images/graemlins/cool.gifing

What about wimax?That provides whole states with wi-fi.Amature radio already provide fast internet useing beacons & UHF over long distences.

Wi-fi is quite dangerous!!As there are wi-fi adapters putting out 20w on 2.4GHz with the antenna on your lap or very near!!! /forums/images/graemlins/confused.gif

I use up to 10w with a directional antena well away from me /forums/images/graemlins/cool.gifEven in a bay at anchor with a less directional antena 3/4w is enough for a good wi-fi conection

It would be nice to have a fast HF conection then there would be wonderful safe anchorages that we could use during summer without haveing to visit a crowded busy place just to send & download.
 
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