[DSP-10] A Clock Question

[Bob Larkin]

Hi Mike,

Is the relationship between the NMEA GGA sentence and the actual GPS time 
fixed?  If so, it can be handled by the current implementation. This allows 
for an offset between the end of GGA sentence and the 1PPS pulse 
timing.  The current software keys on GGA for minutes and seconds, but also 
reads GSV when they are available and summarizes that data.  GSV can come 
anytime, and the latest are used.

Rockwell binary would fit into the current scheme, but if NMEA works, that 
is easier, as it i there. The UT+ runs in binary.

  Also, page 8 of your freq reference paper:
http://mysite.verizon.net/n1jez/osc/A%20Simple%20GPS%20Stabilized%2010%20MHz%20Oscillator.pdf
shows the NMEA strings without an ending asterisk and check sum. I assume 
these are there in real life?

Also, have you compared your Jupiter system performance with Shera's?

Thanks for the comments and help.

73, Bob

At 03:34 AM 3/13/2006, you wrote:
>Hi Bob,
>
>Sounds great!
>
>Any chance of supporting Rockwell Binary with 1 PPS?? This would allow use
>of the surplus Jupiter GPS units. They can output NMEA, but there is a known
>issue with the NMEA strings. They lag 2-3 secs behind actual time. The
>Binary mode doesn't suffer from this problem.
>
>The other reason for Jupiter support is that they form the basis of a nifty
>low cost 10 MHz GPS Stabilized Oscillator. See:
>
>http://mysite.verizon.net/n1jez/index.html
>
>Also would it be good to support the Z3801A?
>
>My goal is to use my Z3801A here in the shack, but the Simple 10 MHz Osc
>while in the field.
>
>73,
>Mike, N1JEZ
>"A closed mouth gathers no feet"
>
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