Difference between revisions of "Calculated Current"
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First you calculate the dB difference in power. | First you calculate the dB difference in power. | ||
| − | <math>35,4 - 35,1 = 0,3 dB</math> | + | <math>35,4 - 35,1 = 0,3\ dB</math> |
*'''Note:''' the unit is dB not dBm | *'''Note:''' the unit is dB not dBm | ||
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Calculate the calibrated current to dBmA so we can add the value. | Calculate the calibrated current to dBmA so we can add the value. | ||
| − | <math>20 * log10(137) \approx 42,73441134</math> | + | <math>20 * log10(137) \approx 42,73441134 \ dBmA</math> |
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Calculate this back to mA: | Calculate this back to mA: | ||
| − | <math>10^{\frac{43,03441134}{20}} \approx 141,8144768</math> | + | <math>10^{\frac{43,03441134}{20}} \approx 141,8144768 \ mA</math> |
Revision as of 12:36, 13 June 2008
Calculated current is the current determined from the calibration. This document describes how you should calculate the calculated current correctly.
| Frequency (MHz) | Current (mA) | Forward Power (dBm) |
|---|---|---|
| 201,973 | 137 | 35,1 |
Question: What is the calculated current if the forward power is 35,4 dBm at the same frequency?
Answer: 141,8144768 mA
The calculation
First you calculate the dB difference in power.
- Note: the unit is dB not dBm
Calculate the calibrated current to dBmA so we can add the value.
So after the addition of the power difference the new value is 43,03441134 dBmA.
Calculate this back to mA:
