Re: [Discuss-gnuradio] trouble with gr_multiply_const_ff

[Marcus Müller]

Hi Lee,
I don't quite understand what these images show, and they're too small 
to read the axes.
Could you elaborate on where you take them from? Is the input data the same?

Whitout guarantee, I'd assume that multiply_const_ff works quite well, 
and that the problem is somewhere else.
What does your to_complex do?

Greetings,
Marcus

On 29.11.2013 03:56, atools_cook wrote:
> Hi all,
>
> I'm working on the gen2_reader project and got some trouble with the amp
> block. We use the gr_multiply_const_ff to amplify the power of signal.
>
> amp = gr.multiply_const_ff(amplitude)
> tx = uhd.usrp_sink(options.args,        uhd.io_type.COMPLEX_FLOAT32,
> num_channels=1,)
> self.connect(self.reader, amp, to_complex)
> self.connect(to_complex, tx)
>
> I found an threshold of amplitude, when amplitude < 40, the signal tx block
> transmited looks like the amp20,png (that what we want) and when amplitude
> > = 40, the signal is just the same to amp5000.png which get several peaks in
> the signal we want to eliminate.
>
> As the amplitude reflect the power of signal we transmit and need to be set
> at least 5000 to power the tag, so we have to eliminate the peaks.
>
> Is there some methods to deal with the amplitude, or just replace the
> multiply_const_ff block with any other blocks?
>
> Thanks for any advice
>
> Lee
>
> <http://gnuradio.4.n7.nabble.com/file/n45018/amp20.png>
>
> <http://gnuradio.4.n7.nabble.com/file/n45018/amp5000.png>
>
>
>
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