Formulas

The formulas you will need are the ones we have discussed.
The four above are common useful representations.

But depending on your previous experience and training you may prefer similar alternate forms.
The list below includes those above and most of the variations that students at the Training Center have chosen to use at one time or another.
If you like you may print this page for reference.

dB = 10 x LOG[ P_out / P_in]

dBm = 10 x LOG[ P(milliwatts)]

Duty Cycle = PW x PRF

Average Power = DC x Peak Power

dBm = 10 log P_out / 1mw

DCdB = 10 log DC

Duty Cycle(DC) = PW@3dB x PRF

P_avg = P_peak x DC

P_peak = P_avg / DC

dBm_avg = 10 log P_avg / 1mw

dBm_peak = 10 log P_peak / 1mw

dBm_avg = dBm_peak + DCdB

dBm_peak = dBm_avg - DCdB

P_avg = Antilog( dBm_avg / 10 ) x 1mw

P_peak = Antilog( dBm_peak / 10 ) x 1mw

Microwave loss = dBm_ant - dBm_xmt (Note: Average or Peak)

Microwave loss = 10 log P_ant / P_xmt (Note: Average or Peak)

For converting 3dB, 4dB, or 6dB PW measurement points to a %
(doing TDS-420 Oscilloscope automatic measurements) the formula is
%_avg = Antilog( -XdB_avg / 20 ) x 100

where XdB_avg is 3, 4, or 6