I think there is confusion between where there is a negative delay. Yes the M12 can have a negative value but in order to correct for the full range of the saw tooth at zero the DS chip has to add 128 nsec delay plus the zero value. Depending on the message it ads or subtracts from that value. As saw teeth get smaller there are chips with .25 and .5 nsec. steps. Later GPS units have messages with higher resolution steps. Bert Kehren In a message dated 5/18/2014 8:26:31 P.M. Eastern Daylight Time, [email protected] writes:
-128 is 0x80 +127 is 0x7F If in doubt, just look at the sawtooth correction messages coming out of your M12. /tvb (i5s) On May 18, 2014, at 4:17 PM, Chris Albertson <[email protected]> wrote: >> Chris, >> >> The manual clearly states -128 to +127. What's your problem with that? > > Yes it gives that range. It says the value is stored in 8 bits. > > But how is it stored? Certainly not as sign bit and 7 bit magnitude > or you could not have -128. They don't say but options are either > an assumed bias of -128 or twos complement. I bet it's an assumed > bias. > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
