Making a small USRP board

I’m interested in making a much smaller USRP1 board. Has anyone tried
this?
I was planning on stripping out the 2nd AD9862 and the power supply
circuit.
Is there anything I should watch out for?
Thanks.
-William

Yes, same functions, just smaller and only one rx/tx pair.
-William

On Friday, August 27, 2010, Abdalaleem Andy James Potter

Lin,
I don’t know what FDD is. The board would only support it if the
original
board does, and/or if someone implements it.
As of yet, I’m trying to figure out if reducing the size of the USRP1
baord,
by removing one of the transceivers, is feasible. I’m a GNURadio/USRP
newbie
and I’m just going off looking at the pysical board and thinking I
didn’t
need half of it.
-William

FDD - Frequency Division Duplex. You can communicate in both directions
simultaneously using different frequency bands.

/MiO

Right now I’m thinking the easiest thing would be to keep everything the
same, except remove the 2nd mixed-signal chip, and move the power
circuit
off the board.
So, yes, same form factor for daughterboard connections.
-William

Will it support FDD full duplex? I’d like to run OpenBTS on a smaller
USRP.

-Lin

2010/8/28 William C. [email protected]:

On Aug 30, 2010, at 6:52 AM, William C. wrote:

As of yet, I’m trying to figure out if reducing the size of the USRP1 baord, by removing one of the transceivers, is feasible. I’m a GNURadio/USRP newbie and I’m just going off looking at the pysical board and thinking I didn’t need half of it.

Are you considering keeping the same form factor and connectors for the
RF daughterboards (i.e., mounting regular RF daughterboards on a
reduced-size USRP motherboard), or further shrinking the package size by
integrating the RF and digital stuff onto a single, smaller board
dedicated to a specific RF band?


Mark J. Blair, NF6X [email protected]
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.

On Aug 30, 2010, at 8:24 AM, William C. wrote:

Right now I’m thinking the easiest thing would be to keep everything the same, except remove the 2nd mixed-signal chip, and move the power circuit off the board.
So, yes, same form factor for daughterboard connections.

That seems like a lot of effort and expense to make something just a
little bit smaller. Now, if you could make the equivalent of a USRP +
WBX board about the size of a pack of playing cards, and powered from
the USB port, that would be quite interesting!


Mark J. Blair, NF6X [email protected]
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.

I would strongly recommend keeping the LDO on the board, or at least
some form of power filtering or decoupling.

~Jeff

On 8/30/2010 11:24 AM, William C. wrote:

Right now I’m thinking the easiest thing would be to keep everything the
same, except remove the 2nd mixed-signal chip, and move the power
circuit off the board.
So, yes, same form factor for daughterboard connections.
-William


~Jeffrey L., K1VZX

Mark,
Going from 36 sq-in to 18 sq-in is a big improvement for us. We’ll be
using
it on an underwater vehicle, and space is a premium. Your idea for a
smaller
WBX board is cool, but would be a lot of work.
-William

I like “powered from the USB port” too !!

But I know what William want to make now. That will be a half-size
USRP mother board + single daughter board, placed in a small
underwater vehical, and powerd by vehical battery, right? It sounds
interesting!

Lin

2010/8/30 Mark J. Blair [email protected]:

On 08/31/2010 10:41 PM, Lin HUANG wrote:

I like “powered from the USB port” too !!

But I know what William want to make now. That will be a half-size
USRP mother board + single daughter board, placed in a small
underwater vehical, and powerd by vehical battery, right? It sounds
interesting!

Lin

I want something similar, but with an L-band daughter-card, and a 1GiGE
interface!

Although, there are now USB-2.0 extenders that allow you to extend
USB-2.0 over
Cat5e, and I think internally, they use 1GiGE and some kind of
proprietary protocol.


Marcus L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

Ah, I see. That sounds like a neat project.

Craig,

That sounds very interesting. Will the 2450 be integrated or removable?
Most
of our work is at low frequencies (under 100MHz), so that board is too
high
-William

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