In a message dated 2008/07/01, dickthomas01@............. writes:

> http://bachcottage.com/TimingWithinWinSDRx.pdf

Hi Tom,

       First, it is not uncommon to get timing errors of a second or so. The 
Travel Time calculation uses average ground velocities and you may well not be 
average.

       I am not sure how WinSDR actually does the timing, even when corrected 
by GPS. The display program will presumably use the software clock on your 
computer. Have you asked Larry? The software clocks fitted to PC computers are 
often crap. They can loose or gain 10s of minutes per day. 

       What errors do you see when you check your software clock against NIST 
time?   
       http://nist.time.gov/

       Regards,

       Chris Chapman   
In a message dated 2008/07/01, dick=
thomas01@............. writes:



">http://bac=
hcottage.com/TimingWithinWinSDRx.pdf




Hi Tom,



       First, it is not uncommon to get timing=
 errors of a second or so. The Travel Time calculation uses average ground v=
elocities and you may well not be average.



       I am not sure how WinSDR actually does=20=
the timing, even when corrected by GPS. The display program will presumably=20=
use the software clock on your computer. Have you asked Larry? The software=20=
clocks fitted to PC computers are often crap. They can loose or gain 10s of=20=
minutes per day. 



       What errors do you see when you check y=
our software clock against NIST time?   

       http://nist.time.gov/



       Regards,



       Chris Chapman