Techs & Trends
RF Class?
I was just flippin thru some promo material I found in my stock room on the SE t637 (G-D, Sundays are boring) cause I'm lookin at gettin one. The material mentions that the t637 has a "class IV RF" profile. I'm assuming, due to the statements that follow that a class IV is high on the rating, but my question is this.
What is an RF classification, who sets the standards, and where would I find these classes on other phones? A lot of folks that buy/use phones here (myself included) live in rural areas and I'd love to be able to quantify for them how well their phone is going to get a signal.
Does anyone have information on this?
What is an RF classification, who sets the standards, and where would I find these classes on other phones? A lot of folks that buy/use phones here (myself included) live in rural areas and I'd love to be able to quantify for them how well their phone is going to get a signal.
Does anyone have information on this?
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From what i understand about the classifications, they are determined by the FCC as to the amount of RF power they transmit. A radio used on a jet fighter would, for instance, radiate over 300 watts of power. A cellphone is less than 2 watts. Those classifications help identify the health risks associated with using the devices, not how well the phone can receive a signal.
As for testing them, VZW has an extremely exhausting test process in place that quantifies each radios receiver and transmitter sensitivity in fringe environments, combining lab testing, field testing, and user experiences. Thanks, though.
As for testing them, VZW has an extremely exhausting test process in place that quantifies each radios receiver and transmitter sensitivity in fringe environments, combining lab testing, field testing, and user experiences. Thanks, though.
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Hey, this is the only time I've seen it on any cell advertisement. But SE lists the following quote on promo material for the t637:
"Class IV RF. Enhanced reception when you need it."
It's not on any of their other promotional material and I have never seen it on anything else. This of course would lead me to believe that there's an RF classification system for phones that determine thier reception ability, but then again it could be a Sony-Ericsson thing.
"Class IV RF. Enhanced reception when you need it."
It's not on any of their other promotional material and I have never seen it on anything else. This of course would lead me to believe that there's an RF classification system for phones that determine thier reception ability, but then again it could be a Sony-Ericsson thing.
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Sounds like a marketting gimick. Receiver Sensitivity is an engineering art form, not something you can improve by hitting the "Turbo" button.
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yeah it sounds more like they're announcing that it has a certain classification for the techies out there that would recognize it and as far as normal consumers it just sounds official. I dont'think they're really sayin that you can "hit the turbo button" so to speak and up the sensitivity, just that it's already built to a certain sensitivity spec.
I was curious as to whether this is an industry thing, are all phones given an RF classification, or is it just something that SE was doing to promote a good RF profile?
I was curious as to whether this is an industry thing, are all phones given an RF classification, or is it just something that SE was doing to promote a good RF profile?
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They are promoting it because the prior version had a lower RF class and it had horrible signal problems especially in the 850 markets. It is Soiny trying to encourage us to sell the phone. We had a rep come in our store and swear up and down that it would work better.
The T637 has been MUCH better so that is why they are promoting it.
The T637 has been MUCH better so that is why they are promoting it.
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first person to actually answer my question about the 637 THANKS!!!
Now...how in the world do I find the RF classifications on other phones so that maybe I can quantify their reception capabilities for my cust.'s who live in the middle of nowhere?
Now...how in the world do I find the RF classifications on other phones so that maybe I can quantify their reception capabilities for my cust.'s who live in the middle of nowhere?
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I do not know. It is not really given out freely. I use to make a big fuxx at Sprint about determining what the singal was for each phone and no one could get me an answer.
The Sony rep said Nokia and Motorola all use the Class IV like their new phone. I tried to pull more info out of him but they back off when you push them on the subject. All the companies that I have tried to get info about it seem to keep pretty hush about it. Last thing they want is consumers to be able to look up and find out their phone has a crappy signal.
The Sony rep said Nokia and Motorola all use the Class IV like their new phone. I tried to pull more info out of him but they back off when you push them on the subject. All the companies that I have tried to get info about it seem to keep pretty hush about it. Last thing they want is consumers to be able to look up and find out their phone has a crappy signal.
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alrighty then, thanks a lot. I guess I'll have to get all resourceful then.
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I'l reiterate my point. If you don't want to believe it, that's your choice. What does class iv mean? Nothing. Receiver Sensitivity, in CDMA, is measured in FER. At what signal strength is a mobile's FER too high to be able to demodulate the Paging and Traffic Channels? The Paging Channel, the standard says that at -104dBm, the FER cannot exceed .5. However, the Traffic Channel power can go far lower, sometimes to -106 -107dBm.
what causes a call to drop? When a handset fails to receive two good frames consecutively, the handset begins a timer. If after five seconds, the handset still has not received two good frames in succession, the handset must release the Traffic Channel.
So, if one handset fails to receive two good frames at -1...
(continues)
what causes a call to drop? When a handset fails to receive two good frames consecutively, the handset begins a timer. If after five seconds, the handset still has not received two good frames in succession, the handset must release the Traffic Channel.
So, if one handset fails to receive two good frames at -1...
(continues)
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