[time-nuts] New GPSDO on EBAY From China
Charles Steinmetz
csteinmetz at yandex.com
Mon Dec 29 05:50:31 UTC 2014
Li Ang wrote:
>This unit is done by BG7TBL. In his store on taobao.com,
>there is a adev chart. Please refrer to this link
That ADEV chart (see below) raises more questions than it
answers. At least the time constant is not too short (a very common
problem with DIY GPSDOs). But when the GPS takes over above the
crossover (tau ~ 5000 seconds), the ADEV is ~2e-11. GPS should be
significantly better than this at 5000 seconds. It appears that
something is wrong with the design.
Best regards,
Charles
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