Re: [Discuss-gnuradio] No Digital Modulation Working

[senthil murugan]

On 10/22/2012 03:03 PM, Ahmed Zaheer wrote:
> Hi all, I was trying to make a transceiver working on any digital
> modulation. I have tried GMSK, PSK, QPSK, QAM and other blocks
> available in gnuradio companion. But non of them works. All of them
> works in loop back manner but when ever I try to transmit and receive
> on air it simply doesn't work. In the attached file I am using GMSK
> while transmitting a video file. I have also tried audio file, and
> even a simple sine wave but all in vain. I am using USRP N210 with
> SBX daugherboard with VERT 2450 antenna. All of the equipment works
> as I was succeeded in transmitting my voice while doing frequency
> modulation. If anybody can tell me about any mistake while seeing the
> attached file or provide me with any transceiver using any digital
> modulation which should work on latest gnuradio with USRP N210 that
> would really be a great help. I really appreciate your help.
> Regards. Ahmed.
>

Hi,

If things are working fine for FM modulation,then it's surely due to LO offset between Tx & Rx. I hope

you know on how to correct LO offset. 

Sumit: If possible, could you please post some videos and tutorials on LO Offset Correction.