Difference between revisions of "Calculated Current"

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.

**Given calibration information**
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

First you calculate the dB difference in power.

$35,4-35,1=0,3dB$

Calculate the current to dBmA so we can add the value.

$20*log10(137)\approx 42,73441134$ dBmA

So the new value is 43,03441134 dBmA.

Calculate this back to mA

$10^{\frac {43,03441134}{20}}\approx 141,8144768$ mA

@@ Line 21: / Line 21: @@
 <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.
 <math>20 * log10(137) \approx  42,73441134</math> dBmA
 So the new value is 43,03441134 dBmA.
 Calculate this back to mA
 <math>10^{\frac{43,03441134}{20}} \approx  141,8144768</math> mA