Re: [Discuss-gnuradio] RFX2400 Transmit power

[Brian Dunn]

Hi Yong,

I think with maximum signal levels of +/- 45 on the digital side your  
signal would be severely distorted due to quantization noise. Perhaps  
the easiest thing to do would be to put a mini-circuits attenuator  
inline with the SMA output of the RFX2400 board? Not sure if this will  
work for your application though.

-Brian


On Jan 20, 2009, at 8:37 PM, Yong J. Chang wrote:

> Hi, all!
>
> Now I'm using USRP1 and RFX2400 d'board. In our project, we have to  
> be able
> to reduce transmit power down to -40dBm. Please correct me if my  
> approach is
> wrong.
>
> If we set tx_pga=0dB, the transmit power only depends on the level of
> signal. So, +/-32767 can give us maximum transmit power 17dBm  
> because the
> maximum transmit power of RFX2400 is 17dBm.
>
> Since the power is a square of signal level, we can get -40dBm if we  
> choose
> signal level +/-45 roughly.
>
> Am I right?
>
> --
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>
>
>
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