Re: [Discuss-gnuradio] Gain Range error

[Eric Schneider]

Just out of curiosity, was there a design decision made to not use the
DAC PGAs to adjust Tx gain?
 
On Sat, 2010-01-16 at 09:08 -0800, Josh Blum wrote:
> 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
> 
> 
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