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Re: [Discuss-gnuradio] Mux settings...


From: Hans Glitsch
Subject: Re: [Discuss-gnuradio] Mux settings...
Date: Mon, 22 Oct 2007 17:59:58 -0700

Hello,

I may be having similar problems. I'm using 2 basic RX boards and I want to receive four complex signals. I seem to be losing the complex part of the first signal. I was using a mux of 0xf3f2f1f0, and after seeing your message, I tried 0x32103210. Both of them show the same problem with the first signal.

I have tried swapping the usrp parts to see if it was a hardware problem, but the problem persists.

Thanks for your help,
Hans


----- Original Message ----- From: "Eric Blossom" <address@hidden>
To: "Jared Jensen" <address@hidden>
Cc: <address@hidden>
Sent: Monday, October 22, 2007 5:15 PM
Subject: Re: [Discuss-gnuradio] Mux settings...


On Mon, Oct 22, 2007 at 05:13:33PM -0400, Jared Jensen wrote:


What are the proper mux settings for one DBSRX in RXA and one DBSRX
in RXB?  When I used a single DBSRX in RXA 0x00000010 worked well.
But now I want Channel 0 to be RXA, and Channel 1 to be RXB both of
which are I and Q, and not swapped.

So far anything other than 0x32103210 or 0x00000010 produces dirty
output with random-looking noise in the data.

Jared

If you're using a single channel, usrp.determine_rx_mux_value will get you
the right answer, regardless of the type of daughterboard.

On the DBSRX, 0x00003210 (or for that matter 0x32103210) will set you
up with side A routed to channel 0 and side B routed to channel 1.

See http://gnuradio.org/trac/wiki/UsrpRfxDiagrams
and http://gnuradio.org/doc/doxygen/classusrp__standard__rx.html

Eric



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