Thanks again for the help. I think I better understand how to set the
RX mux. I am now working on the multi_file.py example to receive using
2 daughterboards on the same USRP. I want to do the same type of thing
using 2 antennas where RX-A and RX-B (on side A) will receive signal 1’s
I and Q and RX-A and RX-B (on side B) will receive signal 2’s I and Q.
If my understanding is correct, I would set the mux to (0x32103210).
Let me know if this is not correct.
My question now comes on the TX side. I don’t quite understand how to
set the TX mux. I want to transmit using 2 daughterboards on 1 USRP so
I am using the fm_tx_2_daughterboards.py example. I want daughterboard
1 to transmit the I (RX-A) and Q (RX-B) of signal 1 and daughterboard 2
to transmit the I (RX-A) and Q (RX-B) of signal 2. This example uses
the command:
self.u.set_mux(0xba98)
which I don’t think is right for what I want to do, but I don’t really
understand how to set the TX mux in the same way I understand how to set
the RX mux (it seems to be different). How would I set the TX mux to do
what I want?
Thanks
Nick
----- Original Message -----
From: Eric B. [email protected]
Date: Tuesday, March 20, 2007 10:15 am
Subject: Re: [Discuss-gnuradio] Question about Basic TX/RX boards, the
I, Q
On Wed, Mar 21, 2007 at 05:31:36PM -0400, [email protected] wrote:
Thanks again for the help. I think I better understand how to set
the RX mux. I am now working on the multi_file.py example to
receive using 2 daughterboards on the same USRP. I want to do the
same type of thing using 2 antennas where RX-A and RX-B (on side A)
will receive signal 1’s I and Q and RX-A and RX-B (on side B) will
receive signal 2’s I and Q. If my understanding is correct, I would
set the mux to (0x32103210). Let me know if this is not correct.
Correct.
really understand how to set the TX mux in the same way I understand
how to set the RX mux (it seems to be different). How would I set
the TX mux to do what I want?
self.u.set_mux(0xba98) 
It is different, it’s the Tx mux, not the Rx mux…
/*!
- \brief Set output mux configuration.
-
-
-
3 2 1
- 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
- ±------------------------------±------±------±------±------+
- | | DAC3 | DAC2 | DAC1 | DAC0 |
- ±------------------------------±------±------±------±------+
-
- There are two interpolators with complex inputs and outputs.
- There are four DACs.
-
- Each 4-bit DACx field specifies the source for the DAC and
- whether or not that DAC is enabled. Each subfield is coded
- like this:
-
-
3 2 1 0
- ±±----+
- |E| N |
- ±±----+
-
- Where E is set if the DAC is enabled, and N specifies which
- interpolator output is connected to this DAC.
-
- N which interp output
-
- 0 chan 0 I
- 1 chan 0 Q
- 2 chan 1 I
- 3 chan 1 Q
-
*/
bool set_mux (int mux);
Thanks
Nick
You’re welcome!
Eric