Half USRP


#1

Hello
This is for Matt.
I’m not aware about USRP requirement’s history, hence I’m asking.
I apologise immediately if the question is stupid enough… :slight_smile:

have you ever think about a simplified USRP, or 1/2 USRP, having only 1
side TX and RX?
Would it make a cost difference (maybe on a large volume basis)? Would
it save some space?
Reason for asking is that many (most?) applications are 1+1 channel, and
saving space may allow more compact boxes,
etc etc.

Thanks for your answer

alberto.

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#2

Hi Alberto,

the USRP2 is only 1xTX and 1xRX. However, the USRP2 costs more than
the USRP1 because of its bigger FPGA and faster ADC/DAC (in addition
to SDRAM and other hardware). In short, the cost savings are minimal
if you would remove one RX and one TX from the USRP1 (you might be
able to choose a smaller ADC/DAC, and save some connectors). However,
you could save quiet some space (half of the board).

Hope that helps.

Cheers,

Thomas

On Mon, May 18, 2009 at 8:33 AM, Alberto T.
removed_email_address@domain.invalid wrote:

Thanks for your answer
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio


“Don’t complain; Just work harder” - Randy Pausch

Thomas S., Ph.D. Candidate
Networked & Embedded Systems Laboratory (NESL)
University of California, Los A. (UCLA)


#3

have you ever think about a simplified USRP, or 1/2 USRP, having only 1 side TX and RX?
Would it make a cost difference (maybe on a large volume basis)? Would it save some space?
Reason for asking is that many (most?) applications are 1+1 channel, and saving space may allow more compact boxes,
etc etc.

How about a 64 x USRP? It would be cool if there was a USRP that had
many receiver channels, and it would also have a simple beam-former
built into the FPGA.

juha


#4

have you ever think about a simplified USRP, or 1/2 USRP, having only 1 side TX and RX?

How about a 64 x USRP? It would be cool if there was a USRP that had
many receiver channels, and it would also have a simple beam-former
built into the FPGA.

All of the schematics for the USRP and daughter boards are available
in the usrp-hw branch
(http://www.gnuradio.org/trac/browser/usrp-hw/trunk).

You are free to build a 1/2 USRP, just remove the components you don’t
need, or, if you wish, put a 1/2 USRP and a dedicated daughter board
on the same PCB, it’s up to you.

The problem with asking matt or one of the other gnuradio contributors
to do this is that it’s not as simple as it sounds on the surface:

You would need to remove the extraneous components on the USRP
boards, re-do the layout, then fab and test a new board. Then you
also have to re-write the FGPA firmware and sink/source blocks in
gnuradio. It’s definitely do-able, but it’s not a “while you’re at
it” type of project.

There was a very recent discussion on the board regarding a ‘hand
held’ sized usrp where we discussed these same issues.

Jason