And try to put the unused I/O pins to GND too. Xilinx suggests, to reduce
noise, to ground the FPGA using as more free I/O pins as possible and
configure them as low logic level. Of course this trick does apply to other
brands too.
On Sat, Jun 9, 2012 at 6:54 AM, Hal Murray wrote:
> > * Connect
> * Connect all free pins of the FPGA to a 2.54mm header pin connector
Don't go overboard on the "all" if that makes a mess of the routing or layout.
Be sure to put "enough" ground pins on the header(s). Power too.
--
These are my opinions. I hate spam.
__
> http://kom.aau.dk/~borre/easy2/
Oops, sorry, that was for the previous book. For the
software-receiver book, you want this page:
http://kom.aau.dk/project/softgps/
I'm not sure the source code is in the demo CD image, though (the "GPS
SDR demo" link).
Cheers,
Peter
_
On Wed, 6 Jun 2012 10:24:12 -0700
Peter Monta wrote:
> Hi Attila,
>
> > Could you also add just the option of a power splitter at the input?
>
> I'm not really sure what the most appropriate RF interface is. I was
> planning to make another much simpler board with just a bias tee, a
> 3:1 spli
On Wed, 6 Jun 2012 10:08:24 -0700
Peter Monta wrote:
> I was thinking to do a resistor-programmable option to either use the
> 10 MHz or the TCXO as input to the LMK03806. I'm not sure there's a
> huge advantage to using a more stable clock, though. The TCXO is
> probably plenty good enough for
> [ Borre GPS book ]
>
> However, it does not appear that they let me download the
> matlab code that comes on the CD that comes with the book. do you know
> if it's available somewhere?
I think it's here:
http://kom.aau.dk/~borre/easy2/
The last entry, the zip file, looks to be the most recent.
Hi Attila,
> Could you also add just the option of a power splitter at the input?
I'm not really sure what the most appropriate RF interface is. I was
planning to make another much simpler board with just a bias tee, a
3:1 splitter, and some hairpin microstrip filters. Then it would be
three sh
Oops, sorry, hit the send button too soon.
Another nice book on GPS signal processing is the one by James Tsui,
_Fundamentals of Global Positioning Receivers: A Software Approach_.
I learned a lot from it.
Cheers,
Peter
___
time-nuts mailing list -- ti
On Wed, Jun 6, 2012 at 9:33 AM, Eric Garner wrote:
> On Tue, Jun 5, 2012 at 12:53 PM, Attila Kinali wrote:
>> On Tue, 05 Jun 2012 15:40:48 -0400
>> Michael Tharp wrote:
>>
>>> On 06/05/2012 03:31 PM, Attila Kinali wrote:
>>> > * The XC6SLX9 is<10USD more expensive than the SLX6. I think the adde
Hi Attila,
> * Connect all free pins of the FPGA to a 2.54mm header pin connector
> This would make extensions to the system a lot simpler.
> Up to the point of using a simple uC board for a full fledged
> GPSDO system. Additonally put onto this connecter an unused output
> of the LMK03806 and
On Tue, Jun 5, 2012 at 12:53 PM, Attila Kinali wrote:
> On Tue, 05 Jun 2012 15:40:48 -0400
> Michael Tharp wrote:
>
>> On 06/05/2012 03:31 PM, Attila Kinali wrote:
>> > * The XC6SLX9 is<10USD more expensive than the SLX6. I think the added
>> > value of having twice as much "real estate" would
Hi Michael,
> What is the function of the clock/PPS inputs?
They could be used to compare a master station clock with the GPS
signals. It seems like a good idea to put the clock and PPS through
the same path as the satellite signals. The goal was to permit a good
comparison between GPS and any
On Tue, 5 Jun 2012 21:31:32 +0200
Attila Kinali wrote:
> I had a cursory look at the schematics and i would propose the following
> changes:
>
Addendum:
Could you also add just the option of a power splitter at the input?
This would allow to use one antenna while using a cheaper SMB mounted
p
On Tue, 05 Jun 2012 15:40:48 -0400
Michael Tharp wrote:
> On 06/05/2012 03:31 PM, Attila Kinali wrote:
> > * The XC6SLX9 is<10USD more expensive than the SLX6. I think the added
> >value of having twice as much "real estate" would justify the additional
> >price.
>
> Some vendors don't e
On Tue, 05 Jun 2012 13:48:17 -0400
Michael Tharp wrote:
> Disclaimer: I know very little about actually implementing a GPS
> receiver, and about RF in general, but I know a cool project when I see
> one and this has a lot of the elements needed for a fully open-source
> timing receiver. Lookin
On 06/05/2012 03:31 PM, Attila Kinali wrote:
* The XC6SLX9 is<10USD more expensive than the SLX6. I think the added
value of having twice as much "real estate" would justify the additional
price.
Some vendors don't even stock the SLX6, including Digi-Key! Agreed
though, it would be neat
On Tue, 5 Jun 2012 08:03:53 -0700
Peter Monta wrote:
> o far I have a prototype board outputting bits from which GPS signals
> on L1 and L2 have been successfully acquired and tracked. Next steps
> are to play with acquiring some GPS L5, Glonass, and Galileo signals,
> and to apply some minor cl
On 06/05/2012 11:03 AM, Peter Monta wrote:
I've been working on a front-end board suitable for GPS and other GNSS
systems. It might be of interest to time-nuts given the application
to timing receivers.
Very impressive. Since I discovered time-nuts this is exactly what I
wanted to make, and y
I've been working on a front-end board suitable for GPS and other GNSS
systems. It might be of interest to time-nuts given the application
to timing receivers.
Goals for the project:
- high-quality signals from all current and near-future GNSS systems
(GPS, Glonass, Galileo, Compass)
- wide ban
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