Calculated Current: Difference between revisions
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<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 | ||
Calculate the current to dBmA so we can add the value. | Calculate the current to dBmA so we can add the value. | ||
<math>20 * log10(137) \approx 42,73441134</math> dBmA | <math>20 * log10(137) \approx 42,73441134</math> dBmA | ||
So the new value is 43,03441134 dBmA. | So the new value is 43,03441134 dBmA. | ||
Calculate this back to mA | Calculate this back to mA | ||
<math>10^{\frac{43,03441134}{20}} \approx 141,8144768</math> mA | <math>10^{\frac{43,03441134}{20}} \approx 141,8144768</math> mA | ||
Revision as of 12:21, 13 June 2008
Calculated current is the current determined from the calibration. This document describes how you should calculate the 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[edit]
First you calculate the dB difference in power.
- Note: the unit is dB not dBm
Calculate the current to dBmA so we can add the value.
dBmA
So the new value is 43,03441134 dBmA.
Calculate this back to mA
mA
