Hi
On Jun 15, 2013, at 10:38 PM, Hal Murray <[email protected]> wrote: > > [email protected] said: >> I think spitting the "bit" out a PC serial port line and running a 74HC >> series switch would be pretty easy. Less than $10 in parts including the >> pert board and the time to solder the roughly eight connections. > > How accurate does the switching have to be? Any error will show up as a carrier drop out. As long as 90-99% of the carrier is corrected the downstream radio should be ok. > > Note that there are 2 dimensions to the answer. One is time, how close to > the target time does the switching have to occur? Best guess is that if you transition the switch in < one cycle at 60 KHz you should be fine. Call it < 15 us if you need a number on it. That's just the transition time. The code alignment would be fine at 1 ms, ok at 10 ms, and messy at 100 ms. > > The other dimension is digital. What happens if some of the bits are wrong? > How many can be wrong before the 8170 won't lock? There are a dozen bits at > the end that I'm not sure I can predict, the DST/Leap/notice stuff. That's the part that I'd like to see better definition on. I think you can do the DST and leap year bits, it's the data / notice bits that are undefined at this point. Bob > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > 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.
