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viewfly · 08-25-2008, 2:19 PM

Here are some test results from a Swedish company showing that the 3G antenna performs normally in transmission power and received signal compared to Nokia N73 and Sony Ericsson P1.

TIS is the phone's ability to receive low signals from the tower; TRP is the power transmitted to the tower from the phone.

The values are completely normal, says Magnus Franzén, an antenna engineer with an M.Sc. in Engineering Physics.

We compare the results with those of a Sony Ericsson P1 belonging to Bluetest's CEO Mats Andersson, and my Nokia N73. The P1 is a little better at receiving signals and the N73 a little better at transmitting signals. But the difference is small. The difference between the iphone's and the P1's receive sensitivity is 2 dB.

- It is not much. At a difference of 4-6 dB one might start to wonder if there is anything wrong, says Mats Andersson.

Full article here:

Iphone 3G antenna test - null - Göteborgs-Posten

See the article for a nice picture of the test chamber.

viewfly · 08-25-2008, 2:26 PM

I think this demonstrates that any iPhones having real reception problems are the result of a QC problem in one of the factories, and not the generic antenna design.

elmo01 · 09-01-2008, 8:58 AM

decibels are not measured on a linear scale... logarithmic... a 3db gain or loss is doulbling or halving the reference sample... 2db is significant

viewfly · 09-02-2008, 6:52 PM

Quote:

Originally Posted by elmo01

decibels are not measured on a linear scale... logarithmic... a 3db gain or loss is doulbling or halving the reference sample... 2db is significant

All you say is correct, but 2db in this case is not really significant. The article states that the uncertainty in the measurement between 2 phones is 1 dB alone. So another 1 dB on top of that is really insignificant.

Comparing 2 phones at home will show you how difficult a measurement this is to within 2 dB and say there is a real difference between them. But 4,6 or more dB is and indicates that a real problem exists.

skystartrade.com · 09-06-2008, 4:12 PM

3g has very low siginal when it is in standby. when you place a call, the signal go up. did you see this on our iphone too?

yes, the signal is really weak in standby

the signal is a lot better in t-mobile network

viewfly · 09-08-2008, 9:50 PM

Quote:

Originally Posted by skystartrade.com

3g has very low siginal when it is in standby. when you place a call, the signal go up. did you see this on our iphone too?

No, I don't see that. However, many times when I unlock the phone, it is at full bars, then goes down from there.

Signal is good on ATT too, depending where you are.

08-25-2008, 2:19 PM	#1 (permalink)
viewfly Mobile Advisor Join Date: Jun 2003 Location: Connecticut Posts: 1,907 Phone(s): iPhone 3G (2), Nokia 6131, 6230b, Moto RAZR V3 Provider(s): AT&T GSM and it's predecessors since 1995 Devices: HS700, NuviGPS,Ipod Thanks: 7 Thanked 19 Times in 12 Posts	Test shows 3G antenna normal Here are some test results from a Swedish company showing that the 3G antenna performs normally in transmission power and received signal compared to Nokia N73 and Sony Ericsson P1. TIS is the phone's ability to receive low signals from the tower; TRP is the power transmitted to the tower from the phone. The values are completely normal, says Magnus Franzén, an antenna engineer with an M.Sc. in Engineering Physics. We compare the results with those of a Sony Ericsson P1 belonging to Bluetest's CEO Mats Andersson, and my Nokia N73. The P1 is a little better at receiving signals and the N73 a little better at transmitting signals. But the difference is small. The difference between the iphone's and the P1's receive sensitivity is 2 dB. - It is not much. At a difference of 4-6 dB one might start to wonder if there is anything wrong, says Mats Andersson. Full article here: Iphone 3G antenna test - null - Göteborgs-Posten See the article for a nice picture of the test chamber.

08-25-2008, 2:26 PM	#2 (permalink)
viewfly Mobile Advisor Join Date: Jun 2003 Location: Connecticut Posts: 1,907 Phone(s): iPhone 3G (2), Nokia 6131, 6230b, Moto RAZR V3 Provider(s): AT&T GSM and it's predecessors since 1995 Devices: HS700, NuviGPS,Ipod Thanks: 7 Thanked 19 Times in 12 Posts	Re: Test shows 3G antenna normal I think this demonstrates that any iPhones having real reception problems are the result of a QC problem in one of the factories, and not the generic antenna design.

09-01-2008, 8:58 AM	#3 (permalink)
elmo01 Join Date: Jul 2006 Location: Halifax Posts: 304 Thanks: 0 Thanked 2 Times in 2 Posts	Re: Test shows 3G antenna normal decibels are not measured on a linear scale... logarithmic... a 3db gain or loss is doulbling or halving the reference sample... 2db is significant

09-06-2008, 4:12 PM	#5 (permalink)
skystartrade.com Fresh Member Join Date: Feb 2005 Posts: 39 Thanks: 0 Thanked 0 Times in 0 Posts	3g has very low siginal when it is in standby. when you place a call, the signal go up. did you see this on our iphone too? yes, the signal is really weak in standby the signal is a lot better in t-mobile network Last edited by Jay2TheRescue; 09-10-2008 at 9:14 AM. Reason: Combine multiple one line posts.

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