Re: [Discuss-gnuradio] Re: Re: transmitting two independent Signals

[Eric Blossom]

On Fri, Feb 23, 2007 at 10:17:21AM +0100, anmar wrote:
> Eric Blossom wrote:
> > On Wed, Feb 21, 2007 at 11:11:17AM +0100, anmar wrote:
> >> > stream of complexes.  (Yes, the interface is a bit strange and ought
> >> >   fg.connect(interleaver, u)
> >> > That's right.  If you're using a single Basic Tx daughterboard, and
> >> > you want independent real output out the I and Q, that'll take a fair
> >> > amount of hacking.  Using two daughterboards is going to be much, much
> >> > easier ;)
> >> 
> >> ok that is to bad, but do you know any one how tried to do this
> > 
> > No.
> > 
> >> or do you know where to begin hacking :)?
> > 
> > Getting this right requires understanding how the host, the FPGA code
> > and the AD9862 all interact.  If you've been following Brian's
> > questions about the FPGA over the past few days, you're on the right
> > track.  Note also, that if you send two real signals to the AD9862 you
> > lose the use of the digital up converter ("Fine Modulator") in the
> > AD9862.  Assuming you need a DUC, you'll have to reimplement this
> > functionality in the FPGA.  [In "two independent real signal mode" you
> > only have Block C "Interpolator" and Block B "Coarse Modulator"
> > available.]
> > 
> >> We just want to see if it can be done with the time that we have, or 
> >> just go and use two Tx daugterboards.
> > 
> > Any particular reason you don't want to use two Tx daughterboards?
> > If you use two Tx daughterboards, you could have your independent-signal
> > transmitter up and working in 30 minutes.
> > 
> > Eric
> 
> hi Eric,
> can you post an example that transmits to tx signales from two tx 
> boards?
> we have trying the code that you posted earlier, but it won't work. we 
> have tyied the fm_tx_2_daugtherboards.py that worked well, but is pit 
> comcplicated to understand and when modifying it don't work any more.
> 
> thanks in advance
> anmar and wim
> 

The fm_tx_2_daughterboards.py code is about the simplest code that
transmits on two daughterboards.  What part of it do you have
questions about?  Do you understand how to transmit on a single
daughterboard? 

Eric