Transmit on both Tx ports (USRP1.)

Hello,

Im using an RFID package already made (by M. Buttner), and trying to
alter
the python script to output the same message signal on both Tx_A and
Tx_B
but on different carriers. However i can’t seem to make it work. I have
searched the net for examples of how to transmit on both channels with
the
same signal, but can’t find anything. The carrier setting i am pretty
sure i
have correct.

I get a error as I’m trying to set the usrp.sink_c with nchan=2 and
further
set the tx.set_mux with ((0,0),(0,1)) for targeting the Tx_A and Tx_B
port.

Further more i don’t know if the flow graph needs to be altered as my tx
sink then needs to latch the same data out on both ports? Or is there a
more
efficient way to implement this?

Can someone please help me, or refer to a forum or anything where such a
question is possibly answered.

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Hi RuneS,

please provide more info (see
http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors).
At the very least, post the error message.
Also, you seem to be not using UHD (which most people here use).

MB

On Tue, Mar 20, 2012 at 04:39:09AM -0700, RuneS wrote:

I get a error as I’m trying to set the usrp.sink_c with nchan=2 and further
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Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin B.
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu

KIT – University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

Hi Martin,

Sorry about not posting my error message, however i think I have it
almost
correct now. At least i don’t get errors when executing the python
script.
My problem is now i was expecting my message signal to be modulated on
both
carrier frequencies. But when i for instance set my Tx_A to RF 900 MHz
and
my Tx_B to RF 800 MHz, i only see the fully modulated signal on Tx_A.
Tx_B
is just the unmodulated carrier at 800 MHz.

I guess i need to make some changes in the flow graph, to set the
message
signal to Tx_B also. Could you point me in the direction of how this is
done
the most effective? i guess my Tx block needs two inputs now, but they
need
to be the same signal? The RFID package is struggling to keep the
latency
requirement as is, so i need to do this effectively.

Im not using UHD because the RFID package does not support UHD, thus I’m
on
Gnuradio 3.3.0

Martin B.-4 wrote:

On Tue, Mar 20, 2012 at 04:39:09AM -0700, RuneS wrote:

sure i
efficient way to implement this?
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