The TPM readings seem to be band limited
We have 3 modes of operation at 11, 22 and 45 MHz Bandwidth. For the same measured output power, the TPM reading is as listed below. Note that my receiver and transmitter filters are set correctly since the system is working at reasonable SNR while conducting the tests.
BW [MHz] 11 22 45
Measured power [dBm] 23.2 22.8 22.6
ave TPM reading 60 82 105
ave TPM reading [dBx] -15 -20.5 -26.25
So there is a drop of about 6dB each time we double the bandwidth at the same power level. What could account for that?