Re: [time-nuts] GPS vagaries and binary interface

2006-10-29 Thread Dr Bruce Griffiths
Dr Bruce Griffiths wrote: > Didier Juges wrote: > >> Dr Bruce Griffiths wrote: >> >> >>> Didier >>> >>> Alternative GPSDO solution >>> Divide the 10MHz reference by 32 resync the output to 10MHz with a fast >>> D flipflop and then divide the D flipflop output by 4 using a 2 bit >>> swi

Re: [time-nuts] GPS vagaries and binary interface

2006-10-29 Thread Dr Bruce Griffiths
Didier Juges wrote: > Dr Bruce Griffiths wrote: > >> Didier >> >> Alternative GPSDO solution >> Divide the 10MHz reference by 32 resync the output to 10MHz with a fast >> D flipflop and then divide the D flipflop output by 4 using a 2 bit >> switchtail ring (Johnson) counter. >> Low pass filte

Re: [time-nuts] GPS vagaries and binary interface

2006-10-29 Thread Dr Bruce Griffiths
Didier Juges wrote: > Dr Bruce Griffiths wrote: > >> Didier Juges wrote: >> >> >> >> >> >>> That's the impression I am getting. I do not know if any of the GPSDO >>> that I have seen described in recent literature take care of this properly. >>> It seems when the GPS goes nuts, the 1

Re: [time-nuts] GPS vagaries and binary interface

2006-10-29 Thread Dr Bruce Griffiths
Didier Juges wrote: > Dr Bruce Griffiths wrote: > >> Didier >> >> Alternative GPSDO solution >> Divide the 10MHz reference by 32 resync the output to 10MHz with a fast >> D flipflop and then divide the D flipflop output by 4 using a 2 bit >> switchtail ring (Johnson) counter. >> Low pass filte

Re: [time-nuts] GPS vagaries and binary interface

2006-10-28 Thread Didier Juges
Dr Bruce Griffiths wrote: > Didier Juges wrote: > > > > >> That's the impression I am getting. I do not know if any of the GPSDO >> that I have seen described in recent literature take care of this properly. >> It seems when the GPS goes nuts, the 1 PPS goes quite a bit out of >> normal ran

Re: [time-nuts] GPS vagaries and binary interface

2006-10-28 Thread Didier Juges
Dr Bruce Griffiths wrote: > > Didier > > Alternative GPSDO solution > Divide the 10MHz reference by 32 resync the output to 10MHz with a fast > D flipflop and then divide the D flipflop output by 4 using a 2 bit > switchtail ring (Johnson) counter. > Low pass filter the outputs of both divide by

Re: [time-nuts] GPS vagaries and binary interface

2006-10-28 Thread Dr Bruce Griffiths
Didier Juges wrote: > That's the impression I am getting. I do not know if any of the GPSDO > that I have seen described in recent literature take care of this properly. > It seems when the GPS goes nuts, the 1 PPS goes quite a bit out of > normal range, so it should not take too much proces

Re: [time-nuts] GPS vagaries and binary interface

2006-10-28 Thread Dr Bruce Griffiths
Didier Juges wrote: > Dr Bruce Griffiths wrote: > > > > >> Good timing antennas have built in ceramic or equivalent bandpass >> filters to minimise the effect of interference. >> A patch antenna is not as satisfactory as a quadrifilar helix or a choke >> ring ground plane antenna for accurat

Re: [time-nuts] GPS vagaries and binary interface

2006-10-28 Thread Dr Bruce Griffiths
Didier Juges wrote: > Dr Bruce Griffiths wrote: > > > > >> Good timing antennas have built in ceramic or equivalent bandpass >> filters to minimise the effect of interference. >> A patch antenna is not as satisfactory as a quadrifilar helix or a choke >> ring ground plane antenna for accurat

[time-nuts] GPS vagaries and binary interface

2006-10-28 Thread Didier Juges
Dr Bruce Griffiths wrote: > Good timing antennas have built in ceramic or equivalent bandpass > filters to minimise the effect of interference. > A patch antenna is not as satisfactory as a quadrifilar helix or a choke > ring ground plane antenna for accurate timing purposes. > > If GPSDO did