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Old 05-03-2006, 11:34 PM   #1 (permalink)
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Default Could someone explain this ..... PLZ

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I know nothing about cellular transmission and signal strength

This is the quote from a adobe file for a bb. Now I don't understand why a 100 signal is then spoken to in terms of -100. Why? because they didn't want a negative number on the screen? And then they say that that is 2 watts and Weak? How do they figure that it is 2 and why is it weak. So a 10 showing on my phone would be better than a 100?

HERE IS THE QUOTE:

Signal Strength - Rather than looking at the signal strength bars, you can change the display
of the 'signal strength' to read in real numbers. While at the Home Screen (ribbon), hold
down the half moon ALT key while you type NMLL. The bars should change to read
numbers. For the 'signal strength', if you are in the 100 area (that means -100 dBm), you will
be transmitting at maximum power (2 Watts), and since coverage is hit and miss at this weak
a signal, you may end up transmitting many times before the packets make it through. This
might help explain any poorer than normal battery life. I consider anything at -90 to -50
excellent. To get the bars back: While at the Home Screen (ribbon), hold down the half
moon ALT key while you type NMLL again.
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Old 05-04-2006, 05:35 AM   #2 (permalink)
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People may be getting confused by the signal strenght (numeric) since -70 is a better signal strength than -100. People may be thinking that a "bigger" number (-100) is "better" than a "smaller" number (-70).

You want the number to be close to zero. Simple as that. 70 is great. 60 is better. 100 is worse. The further away from zero (which is impossible), the more power and retries the radio needs to do to stay connected.

That's why bars are better for many people. Got three bars, good. Got four bars, better!

Signal strength when measured in dbms should be expressed as a negative number, but frequently it is not.
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Old 05-04-2006, 08:40 AM   #3 (permalink)
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A good way to think of those numbers is to think of the number as the volume that the BlackBerry needs to talk in order for the tower to hear it.

If the BlackBerry can talk at a volume of 50, it's easier to understand, and still lots of room to increase the volume so that the tower can hear it.

If you are in fringe coverage and the BlackBerry has to yell at a volume of 100, that's the loudest it can go, so if the tower can't quite hear it, it can't yell any louder, so it has to retry at the same volume and hope the cell tower can hear it this time.

Now consider the impact on battery life. If the BlackBerry only has to yell at half volume, it's not pushing as much power out, therefore the battery life is better. If it has to yell constantly as loud as it can, then it's going to be using more power and battery life will suffer.

Does this help?

Zro
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Old 05-04-2006, 06:12 PM   #4 (permalink)
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I think out of both of your replies what helps the most is
1. the strength should really be a negative number...it is just expressed as a positive or the absolute value of what it really is

2. There is a difference in signal strength and signal, or rather, phone power. there may be more power with 100, but it is power being used, where as there as there is more strength, signal strength (what matters) with the lower numbers.

Do I have it. I really think I do, in spite of how I may have expressed it even here. you two did a nice job explaining.

Thanks
Eric
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