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 filter the outputs
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 PPS goes quite a bit
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 filter the outputs
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 accurate timing
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 accurate timing
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
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 4
