Re: [Discuss-gnuradio] multiband FM transmission reception problem

[Jason Uher]

Please don't spam the list, the people who know the most about
gnuradio and the usrp, for the most part, have other full time jobs
and provide help on this list as a courtesy.  A response time of
several days is not unreasonable in such situations.

With that in mind, the reason you may not get a response is because
your question is rather vague, there are endless reasons for noise in
a system, not mention we have no idea what modifications you made to
stock files.  Please see the guidelines for questions here:

http://gnuradio.org/trac/wiki/ReportingErrors

In this case we probably need access to a copy of your modified code
(please do not copy and paste into this message) and a more detailed
explanation of what you mean when you say 'the interference
increases', how are you measuring the interference.

Though I can't say I fully understand the gnuradio/USRP combo, I can
say that accurately measuring SNR of the transmission is a difficult
thing to do; that is, there is no direct numerical conversion between
transmit power in gnuradio and the power output from the antennas.
Please see search the mailing list for discussions on this, I found
one right away for bpsk: http://www.ruby-forum.com/topic/152464

I hope you get your application working soon,

Jason

On Wed, May 13, 2009 at 11:51 AM, mayur_CEN <address@hidden> wrote:
>
>
> ANyone can please help?
>
> mayur_CEN wrote:
>>
>>  Hello,I have modified the fmradio.py andfmtx4.py code to make a multi
>> band fm transmission system.The problem is as I increse the number of
>> channels,The interference increases.How do i control the gain and also the
>> SNR of the transmisison.Regards, Mayur Sarode
>>
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>>
>>
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