AT&T, Verizon Battle Smaller Carriers Over 700MHz Roaming
Thank You Qualcomm
"Qualcomm says supporting the right set of bands to allow roaming between AT&T, Verizon Wireless, and the smaller carriers would be incredibly complicated and take years to develop."
For once your ineptitude is a boon.
For once your ineptitude is a boon.
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Funny, they make gsm 3g phones small and thin which house for gsm bands and 4 umts bands, along with bt, wifi and gps radios and receivers and they are all quite thin. And a few even have LTE radios too.
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Versed said:
Funny, they make gsm 3g phones small and thin which house for gsm bands and 4 umts bands, along with bt, wifi and gps radios and receivers and they are all quite thin. And a few even have LTE radios too.
Umm... 700 MHz antennas are about three times the size of 1900 MHz antennas, double the size of GPS antennas and four times the size of Wi-Fi and BT antennas...
The problem is real. If we were deploying LTE in the 2 GHz bands like WiMAX, it wouldn't be an issue.
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Versed said:
And can they be much different then 850 Antenna
Can I lick your face¿
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Versed said:
And can they be much different then 850 Antenna
In physical size, like space consumed within the frame of the phone- the 700s are going to be slightly bigger than the 850s.
Can you use the SAME antenna for 700 MHz and 850 MHz? Probably not. It is possible to design antennas that resonate at multiple frequencies, but with LTE we have to remember that there are two receiving antennas (MIMO) and one transmitting antenna.
Double tuning a physical antenna and applying such a drastically different transmit/receive structure is probably not a reasonable thing to do.
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And the different 700mhz bands are that different that they would require different antenna?
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Versed said:
And the different 700mhz bands are that different that they would require different antenna?
Yes, that is a good question, an issue that I have been contemplating this evening.
The PCS 1900 MHz band is 140 MHz wide, centered around 1920 MHz. That is a deviation of ±4%. PCS devices require only one 1900 MHz antenna.
The Cellular 850 MHz band is 70 MHz wide, centered around 859 MHz. That is a deviation also of ±4%. And Cellular devices also require only one 850 MHz antenna.
But the Upper 700 MHz & Lower 700 MHz bands together are 108 MHz wide, centered around 752 MHz. That is a deviation of ±7%, nearly twice that of PCS 1900 MHz & Cellular 850 MHz. And, as CellStudent not...
(continues)
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Wouldn't the relatively low transmitting output of the device also effect the compensating size ratio of antennae?
In other words, lower wattage in cellphones would require more precise db tuning for maximum efficiency and operation?
This would effectively make your argument for NOT double tuning an antenna, a valid statement.
John B.
In other words, lower wattage in cellphones would require more precise db tuning for maximum efficiency and operation?
This would effectively make your argument for NOT double tuning an antenna, a valid statement.
John B.
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Congratulations! I do not care one way or another. I am just pleased that they cannot execute what Big Brother wants.
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This forum is closed.
