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Re: [Discuss-gnuradio] tx_sampless.cc not working fine...????

From: Josh Blum
Subject: Re: [Discuss-gnuradio] tx_sampless.cc not working fine...????
Date: Wed, 31 Mar 2010 09:27:21 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100217 Shredder/3.0.3pre

What about the gain setting? In grc, the gain setting defaults to 0 dB, this is not the case for tx_samples, try adding -g 0 to the options.


On 03/31/2010 08:37 AM, Krishna S wrote:

   I have some issue with tx_samples.cc and the GRC.

  when i send the file containing complex I&Q samples from GRC
Transmitter side : File Source --->USRP2_sink(interp=16, f=1.8G)


Receiver side:  usrp2_fftsink.py (decim=16,f=1.8G)

I get perfect frequency plot matching exactly as seen in the transmitter side.

when i use tx_samples.cc (interp=16, f=1.8G, -r)  to transmit the same
file. I get the almost same frequency plot with lot of dissortion, I
have checked all the available parameters in the tx_samples.cc but in

I have also , python generated code top_block.py by the
GRC for the above function with the tx_samples.cc , both are sending
32bit floating complex values to usrp2_sink..., how come their results
are different....? even though keeping all the parameters same for both
of them...!

(Tim, i posting with a new subject)

Thank you

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