Re: [Discuss-gnuradio] Transmit on both Tx ports (USRP1.)

[RuneS]

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 Braun-4 wrote:
> 
> 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:
>> 
>> 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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>> Sent from the GnuRadio mailing list archive at Nabble.com.
>> 
>> 
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> 
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> Communications Engineering Lab (CEL)
> 
> Dipl.-Ing. Martin Braun
> Research Associate
> 
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