Calculation of preamble and payload duration

[auvi]

Hi,

Using the power calculator, I am trying to find the preamble duration and payload duration for the following configuration:

Channel = 2
Data rate = 6800
Preamble = 128
PRF = 64
bytes = 12

The following value I am getting:

Preamble duration| = 0,138.40 us
Payload duration = 0,040.00 us

But the verification portion of the power calculator is showing the different result for payload duration. Why is that? please see the attached image.

[auvi]

any idea why the results are different?

[Waite]

I think here is the explanation.

[auvi]

Thanks for the reply.