Lars has done a very good job here and good to see the comments and excitement. Have to agree with HAL that holdover is far more than a second and I am in a good location with the GPS antenna at 90'. I see my 3801 go into holdover occasionally and its not seconds.
Cheapest tinker 10 Mhz is a Xtal with a varicap diode in circuit to adjust frequency. Sub $ 5 I would guess. I was intrigued by the Arduino also and then went looking for information. Just about drowned in whats out there and pricing for the chip is from 99 cents to $5. What bootloader X Y or Z. I like the pure chip 28 pin approach and do appreciate that this won't be H maser accurate. Looked at the schematic and would appreciate a more complete picture. Lars thats a bit more painful to do because everything has to be explicit in the schematic when other may build what you have shared. Though I have shared some ugly schematics on time-nuts. Guilty as charged. Regards Paul. WB8TSL On Thu, Feb 13, 2014 at 3:59 AM, Hal Murray <[email protected]> wrote: > > [Context is cheap VCXO] > > > When used inside a GPSDO it only has to "hold over" for one second until > the > > next correction. > > Only if you have a good antenna and/or antenna location. > > I have several low cost GPS units located in far-from-ideal locations. > They > work most of the time but often fade out for minutes at a time. > > [This is a poor setup for using the output of a GPSDO to feed other > measuring > setups, but it's great for finding corner cases in things like ntpd.] > > > -- > 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.
