1

In an article, I see that it says the spectral level (in Watts/Hz) of a pulse with pulse repetition frequency f (in Hzz) and pulse duration t (in seconds) and pulse peak power P (in Watts) is given as below.

spectral_level (Watts/Hz) = f.P.t^2 

Then, the article says that we convert the spectral level to dBm/kHz as below where F is f in kHz and T is t in microsecond. I know that dBm is 10log(power in milliwatts / 1 milliwatt), but I'm not sure how the term -60 is added in this equation.

spectral_level(dBm/kHz) = P(dBm) + 10log(F) + 20log(T) - 60
1

The -60 is compensating for T being measured in μs rather the s of your first equation.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.