On 02/03/2012 05:30 AM, Jim Lux wrote:
On 2/2/12 12:05 PM, Daniel Schultz wrote:
I found this homebrew GPS receiver project recently:
http://www.holmea.demon.co.uk/GPS/Main.htm
No custom specialized chips that are unavailable in small quantities,
or which
will go obsolete in a few months. I think the best solution for the open
source GPS community is to design open source receivers with commodity
parts
that won't be discontinued in the near future, or for which another
commodity
part can be substituted if need be. Maybe somebody can extend this
design with
a 2-bit ADC on the end (not me, too many projects here already...)
Dan Schultz N8FGV
I still think that finding appropriate off the shelf parts to make a
subharmonic sampler would be a better strategy..
It's all about whether you want IF filters and a mixer+LO or RF filters.
I think the amps are the same either way.
The problem with the limiter design is that it is captured by CW noise.
It's in the literature. Using a few bits reduces the need, but the AGC
control loop needs to be there. With sufficient bits it isn't very
critical with AGC anymore.
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
