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Re: [Discuss-gnuradio] simultaneous receive/transmit with LFRX/TX

From: Eric H. Matlis
Subject: Re: [Discuss-gnuradio] simultaneous receive/transmit with LFRX/TX
Date: Tue, 22 Jan 2008 20:59:52 -0500
User-agent: Internet Messaging Program (IMP) 3.2.6

A fixed latency is fine, as long as it stays fixed, although I'll want to know
what it is.  I noticed an example "...loop....py" (can't remember the name
exactly) which sends and receives on the same USRP; I imagine I can use that


p.s.- I went ahead and ordered the LFTX board.

Quoting Eric Blossom <address@hidden>:

> On Tue, Jan 22, 2008 at 04:41:53PM -0500, address@hidden wrote:
> > Hi all-
> >
> > I looked over the mailing list, and I think I see that what I want to do is
> > possible, but I want to verify before I order the parts:
> >
> > I want to receive an AM modulated waveform using an LFRX, demodulate it,
> > and simultaneously and in a phase-locked way send out the demodulated
> > waveform at baseband from an LFTX so that it can be acquired by a scope or
> > secondary acquisition system.  Basically, the gnuradio device would serve
> > as an intermediary block which demodulates the signal in question so that
> > it can be acquired.  The process needs to be phase locked because I am
> > correlating the input signal with a second signal (a position encoder),
> > both of which will be acquired by the second acquisition system.
> >
> > If anybody can let me know why I can't do this, I would appreciate it.
> > Suggestions also welcome.
> >
> > thanks,
> > eric
> You should be able to do this.  Can you deal with a fixed latency
> between the received signal the output you're generating?
> Eric

Eric H. Matlis, Ph.D.
Aerospace & Mechanical Engineering Dept.
120 Hessert Laboratory for Aerospace Research
University of Notre Dame
Notre Dame, IN 46556-5684
Phone: (574) 631-6054
Fax:   (574) 631-8355

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