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Re: [Discuss-gnuradio] Re: New external clock board for USRP

From: Jason
Subject: Re: [Discuss-gnuradio] Re: New external clock board for USRP
Date: Tue, 20 Oct 2009 10:29:44 -0400
User-agent: Thunderbird (X11/20090817)

Alexander Chemeris wrote:
Hi all,

As I wrote in my previous mail, we're working on an universal clock
source for USRP (and not only for USRP). It is based on 0.28ppm TCXO
from Connor Winfield [1], National Semiconductor LMX2531 VCO+PLL [2]
and LMK01000 CD [3] for clock generation and Atmel ATUSB for control.
So far we've finished PCB design and working on production of the first
25 units. We'll reserve 5 of them for our own use and testing of
different options, 8 others are requested by community people, so there
are more then 10 left for sale. We plan to finish production at
the beginning of Dec and take units to 26C3. If you plan to attend it,
you have a great chance to see them, play with them and take some of
them with you. ;)

Awesome!  I don't think I'll be able to swing 26C3, though.

As we promised, units form this experimental batch will be sold out
for only $100 or 66EUR (without shipping). We kindly invite everyone
interested in such unit to get one and try fitting it to your setup.
Also we need your help determining the best feature set for the unit
(read on for the ample list of possible features). We aim at creating
a really flexible and cheap clocking unit, which may used by a broad
GnuRadio community and will best fit its needs. Unit with open source
software and open hardware.

Can you post the preliminary pcb/gerber/asm files? Are you using geda/pcb, by chance?

Now, lets get to facts. Board dimensions are 86x44mm (3.4" x 1.7") -
it is designed to work inside of USRP box with RFX boards installed
with no external connections.

Default distribution version includes:
1) Clock board with default options
2) U.FL to SMA cable to connect to USRP
3) Power cable to connect to USRP's fan connector

Default board options:
12) 1pps external signal may be used to tame the clock to external
GPS unit. It will be passed to ATMega's interrupt input, so you
should keep in mind that this will need a lot of software work for filtering
out jitter, generated by it. We don't plan to develop this software at
least now, but anyone who need this is welcome to take it.

This would be interesting.



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