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Re: [Discuss-gnuradio] SBX dual receive?

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] SBX dual receive?
Date: Wed, 29 Feb 2012 08:22:55 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

On 29/02/12 07:25 AM, jsrdor wrote:
> Hello, 
> I was wondering whether it is possible to receive from two different
> antennas using a single usrp source and the SBX. I set the subdevices to A:0
> A:0 for the two channels. I set chanell 0 to TX/RX and chanel 1 to RX2. Even
> if i swap the antennas and the chanels it is always that RX2 is receiving.
> It workes fine if i set two different usrp sources one to TX/RX and the
> other to RX2 but then i get overflows all the time. 
> Thanks!
> Jason
There is only a single analog RX chain on the SBX, and it can only be
connected to either TX/RX or RX2
  at any given time.

What you *can* do is take advantage of dual-DDC functions, if the two
frequencies you want to receive
  are both within the analog bandwidth of the card, which is typically
40Mhz.   There's no requirement
  that those two frequencies arrive on different antennae--physics
doesn't care.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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