Simultaneous receive/transmit with LFRX/TX

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


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

On Tue, Jan 22, 2008 at 04:41:53PM -0500, [email protected] wrote:

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

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
version?

thanks,
eric

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

Quoting Eric B. [email protected]:

as an intermediary block which demodulates the signal in question so that
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

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
version?

thanks,
eric

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

Quoting Eric B. [email protected]:

as an intermediary block which demodulates the signal in question so that
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

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
version?

thanks,
eric

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

Quoting Eric B. [email protected]:

as an intermediary block which demodulates the signal in question so that
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

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
version?

thanks,
eric

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

Quoting Eric B. [email protected]:

as an intermediary block which demodulates the signal in question so that
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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