Transmit signal power - How to find from the amplitude set in transmit_path?

GNU Radio
#1

Hi,
I want to calculate the power of the signal(in dBm) transmitted in
benchmark_tx.py. The transmit_path sets an amplitude in the range [0,1]
but
how will I convert this into the actual power. I just want to know where
should I be looking in order to calculate it myself.

Thanks,
John

#2

On Sat, Jul 10, 2010 at 8:32 PM, John A. [email protected]
wrote:

Hi,
I want to calculate the power of the signal(in dBm) transmitted in
benchmark_tx.py. The transmit_path sets an amplitude in the range [0,1] but
how will I convert this into the actual power. I just want to know where
should I be looking in order to calculate it myself.

If I were in your situation, I’d calibrate myself with the hardware
under test by first sending out just a carrier and measuring the power
of the carrier on the frequency you wish to test. Use a meter or
scope to do this part.

Then calculate the peak-to-average power ratio of your modulation to
know how much of your signal has to be backed off to maintain
linearity through your RF PA.

Thanks,
John

Good luck.

Brian

#3

you are right but I don’t neither do i have an scope nor a power meter.
Any
other suggestion?

#4

On Thu, Jul 15, 2010 at 6:11 PM, John A. [email protected]
wrote:

you are right but I don’t neither do i have an scope nor a power meter. Any
other suggestion?

Buy a scope and/or an RF power meter.

Brian