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Why are cell phones still on such low frequencies?

 
Anonymous Coward
User ID: 17803336
United States
12/01/2012 08:04 PM
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Why are cell phones still on such low frequencies?
Ever wonder why when all else keeps improving, cellular phone frequencies are still the same as they always were?

Follow me here, this takes a little set-up to explain.

Fact 1. Even the cheapest WalMart cordless telephones that in their humble beginnings ran at 50 megahertz or so are nowadays operating at 5, even 7 gigahertz.

Fact 2. The higher the operating frequency of the phone, the smaller in size the antenna needs to be.

Fact 3. Cell towers usually have 8 stacks of 8 antennae (called an ARRAY), and these arrays are about the size of an above-ground swimming pool – HUGE.

Fact 4. If cell phones changed their operating frequency and worked at 8 or 9 Gigahertz instead of 800 - 900 Megahertz, cell tower arrays could be about the size of a large gymnastics medicine ball.

Fact 5. The bottom line of any business is PROFIT. You can make more profit if you only have to buy small antenna arrays instead of Huge ones, and you can rent much smaller spaces to put them in.

If cell phones went up to let's say 9 gigs – antenna arrays could be hung up like basketball hoops on telephone poles, compared to covering the better part of the roof of a water tower as is currently required.

So why don’t they change? It’s a curious and little known…

Fact #6 800 – 900 Megahertz penetrates the human skull very, very well and easily.

I’m just sayin’…
bill shitters 1.2

User ID: 19820209
United Kingdom
12/01/2012 08:19 PM

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Re: Why are cell phones still on such low frequencies?
If you looked at the mobiles with new features like internet they my be trial band but generally they run on the 1.8 and up to 2.4 gigs
Which is high enough to still work in built up areas

If phones ran at 9 gigs any semi solid object like mist or rain would block the signal
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Anonymous Coward
User ID: 23905461
Canada
12/01/2012 08:25 PM
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Re: Why are cell phones still on such low frequencies?
Why are TV frequencies the same as they were when TV first came out?
Why is AM and FM not going to higher frequencies?

OP, it is called Standards.
Anonymous Coward
User ID: 17926276
United States
12/01/2012 08:30 PM
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Re: Why are cell phones still on such low frequencies?
its called satanism and paranoia and fear
Life and Love
Live life fully!

User ID: 26735250
United States
12/01/2012 08:31 PM
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Re: Why are cell phones still on such low frequencies?
I'm afraid the OP's "facts" aren't facts.

For instance, the idea that cell antennas are arrayed just isn't true, for that would defeat the omnidirectional coverage. Multiple antennas are used, not as an array, but for diversity reception.
Those who have more than enough should always be mindful of those who have less than enough.
Aunt_Jemima
User ID: 26259916
United States
12/01/2012 08:31 PM
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Re: Why are cell phones still on such low frequencies?
My sell foam is on such a high frequentcy, I hears it all day, specially wen I is in fromt of the microwave and sheeit.


tard
Cat.Man.Deux (OP)

User ID: 17803336
United States
12/01/2012 09:46 PM
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Re: Why are cell phones still on such low frequencies?
I'm afraid the OP's "facts" aren't facts.

For instance, the idea that cell antennas are arrayed just isn't true, for that would defeat the omnidirectional coverage. Multiple antennas are used, not as an array, but for diversity reception.
 Quoting: Life and Love


You sir are a fool and a bullshitter. I hold an Advanced Class Amateur Radio license and when I tell you that an 8 x 8-bay antenna array is used in an omnidirectional compass-rose configuration, you will shut up and listen and learn.
Life and Love
Live life fully!

User ID: 26735250
United States
12/01/2012 09:52 PM
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Re: Why are cell phones still on such low frequencies?
I'm afraid the OP's "facts" aren't facts.

For instance, the idea that cell antennas are arrayed just isn't true, for that would defeat the omnidirectional coverage. Multiple antennas are used, not as an array, but for diversity reception.
 Quoting: Life and Love


You sir are a fool and a bullshitter. I hold an Advanced Class Amateur Radio license and when I tell you that an 8 x 8-bay antenna array is used in an omnidirectional compass-rose configuration, you will shut up and listen and learn.
 Quoting: Cat.Man.Deux


I have a PhD in Electrical Engineering with a specialty in antennas and electromagnetics, with nearly 40 years experience in the field. I just finished a major paper on the degradation of cell phone antennas in a battlefield environment.

But of course you know MUCH more than I do.
Those who have more than enough should always be mindful of those who have less than enough.
Cat.Man.Deux

User ID: 12584735
United States
12/02/2012 06:13 PM
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Re: Why are cell phones still on such low frequencies?
But of course you know MUCH more than I do.
 Quoting: Life and Love


We can sit here in a pissing match with no proof either way all day long, but the fact remains that cell phones, which for several very logical, practical and profitable reasons ought to have their operating frequency raised tremendously yet it remains at 8-900 megahertz with the resultant significant & considerable impact to the bottom line.

There may be more than one reason for this, but the biggest reason is that this frequency range AFFECTS PEOPLE.

Ah has spoken.
Anonymous Coward
User ID: 5588896
Canada
12/02/2012 06:50 PM
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Re: Why are cell phones still on such low frequencies?

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