Re: [Discuss-gnuradio] Gain Range error

[Josh Blum]

On 01/16/2010 01:36 AM, amarnath alapati wrote:
> hi friends,
>   When I tried to print the Transmitter gain range by the following commands,
> The output is as followss,
>
> address@hidden digital]# python benchmark_tx.py -f 2412M
> --show-tx-gain-range
> > > > gr_fir_fff: using SSE
> Tx Gain Range: minimum = 0, maximum = 0, step size = 1
>
> 1) Why is the gain Minimum and Maximum showing the same 0?

The daughter board which you use, has no configurable transmit gain.

> 2) How to control the transmit power ? Should I use the --amplitude command?

This is the amplitude of the digital samples going into the usrp2 
device. You can use higher amplitudes, but be aware that if the 
amplitude is too high, the samples will clip in the fpga dsp. The 
maximum is 1.0 (this will clip).

> 3) can some one breif me on the controlling of transmitter power issue?

Use a mix of digital signal amplitude and programmable hardware gain to 
control the transmit power within the usrp. In this case of your 
daughter board, there is no configurable hardware gain

-Josh