[time-nuts] 3339 Interface for Linux? - was New timing receivers?

Bob Stewart bob at evoria.net
Mon Apr 28 22:28:21 UTC 2014

I was wondering if anyone has a decent interface to the Adafruit and related receivers for Linux?  By that, i mean something like the Windows tools that Globaltop provides, or even just the ability to separate out the responses to the PMTK commands from the NMEA traffic.

Bob - AE6RV

> From: Jim Harman <j99harman at gmail.com>
>To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Monday, April 28, 2014 2:45 PM
>Subject: Re: [time-nuts] New timing receivers?
>On Mon, Apr 28, 2014 at 1:08 AM, Mark Sims <holrum at hotmail.com> wrote:
>> When I was playing with an Adafruit GPS,  it appeared that if it thought
>> you were not moving it would go into a pseudo-position-hold mode and the
>> output coords would not change.  It took it a while to start outputting new
>> coords when you started moving again.  This test was at walking speeds.  I
>> had to walk maybe 100 feet before it started sending new coords.
>The 3339 chip has a command PMTK386 to set its "Nav Speed Threshold." This
>is intended to prevent the position from drifting if the unit is
>stationary. You can also query the current setting with the PMTK447
>command, and it should respond with a PMTK527.

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