On 21 May 2018 at 21:24, Mark Sims wrote: > > One thing to look out for when messing with sawtooth messages is the question of does the message come > out before or after the PPS pulse... good look finding the answer in the receiver documentation... > > "After" seems to be the most common answer. That makes hardware/delay line compensation rather tricky. > Sometimes you can use the antenna cable delay / pps offset commands to shift the pulse before the true > position (assuming that they support negative offsets) and use a longer delay line to add the tweak back in.
In the protocol specification for the Furuno GT-87 ( from, for example: https://www.marutsu.co.jp/contents/shop/marutsu/ds/GT-87ProtocolSpecifications.pdf ) the sawtooth correction figure is given in the CRX message, at the top of page 30 of that document says the figure given refers to the second before last (t-1) ! Peter _______________________________________________ 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.
