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Re: [Discuss-gnuradio] what will be the real transmit power in Watt when

From: Brian Padalino
Subject: Re: [Discuss-gnuradio] what will be the real transmit power in Watt when we change the tx-amplitude in software
Date: Wed, 12 Nov 2008 19:06:40 -0500

On Wed, Nov 12, 2008 at 6:55 PM, Bill Stevenson
<address@hidden> wrote:
> Hello, everyone!
> I am working on the benchmark_tx.py file, I know the transmit power for
> RXF2400 is 50mW. But is this number corresponding to the option
> -tx-amplitude setting to the default value 12000? If it is, i could
> calculate the real tx power after i changed the tx-amplitude parameter.

Assuming a linear amplifier, the power of your modulated signal is
equal to its magnitude squared.

> Another interesting question is that in receive_path.py file, there is a
> parameter called threshold to control the process of carrier sensing, but
> that parameter is in dB and the default value is set to 30dB! Does it mean
> the real threshold value is set to 1000 Watt?  That would be too great! It
> is impossible! If it were not in Watt, is it in mW? I am confused, could
> anyone tell me a little bit about this unit definition in USRP?

It really refers to the dynamic range captured at the ADC.

Please refer to this:



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