[time-nuts] Simple GPSDO

Azelio Boriani azelio.boriani at screen.it
Fri Dec 30 20:36:39 UTC 2011


You can use the LEA5-T too that is a timing GPS receiver and supports the
position hold down-to-1-bird timing mode.

On Fri, Dec 30, 2011 at 8:59 PM, Murray Greenman <denwood at orcon.net.nz>wrote:

> Two thoughts re Simple GPSDOs:
>
> 1. For a conventional 1pps approach, see 'A Simple GPS Disciplined
> Reference" http://www.qsl.net/zl1bpu/MICRO/SIMPLE/SimpleGPS.htm, by yours
> truly. It uses a high performance 10MHz OCXO and gently disciplines it.
> Despite not having a Kalmann filter, the holdover is excellent and the Adev
> is almost as good as the OCXO allows.
>
> 2. The excellent 10kHz design by James G3RUH
> http://www.jrmiller.demon.co.uk/projects/ministd/frqstd.htm requires a
> 10kHz GPS source, and folk on this group asked where you can get a modern
> GPS module with 10kHz output. One suitable answer is any of the u-BLOX
> modules, such as the LEA5-P. These have completely programmable pulse
> outputs in 1us steps (width and duration). I use an older u-BLOX Antaris 4
> development kit which is Atmel based, and it also has a programmable pulse
> output.
>
> 73,
> Murray ZL1BPU
>
>
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