[time-nuts] Thunderbolt? (re simple gpsdo.)

Azelio Boriani azelio.boriani at screen.it
Fri Dec 30 15:48:29 EST 2011


Usually timing grade GPS receivers have better PPS outputs than navigation
GPS receivers and timing grade receivers support the so called position
hold mode that provides a valid PPS output even if only 1 bird is being
received.
Yes, it is better to implement the PPS synchronization in the digital
world: easier to implement very low     low pass filters.

On Fri, Dec 30, 2011 at 9:29 PM, Richard W. Solomon <w1ksz at earthlink.net>wrote:

> I believe those Rockwells have a 10 KHz output. Not a bad price.
>
> 73 es HNY, Dick, W1KSZ
>
>
> -----Original Message-----
> >From: bg at lysator.liu.se
> >Sent: Dec 30, 2011 12:42 PM
> >To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> >Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.)
> >
> >Hi Chris,
> >
> >> I just finished reading about that one.  It requires no longer
> >> available GPS reciever.   Maybe I should r-phrase the question:
> >
> >Most of us get (re)used stuff... Ebay #300437642776 has some Rockwell era
> >receivers. Many time-nuts find HP5065A rubidiums and 5370 counters
> >available and interesting, even though they have not been manufactured in
> >decades.
> >
> >Then there are many receivers besides the Jupiter receivers that have
> >faster-than-1Hz-pulse outputs. Some Oncores have 100PPS. Lots of high end
> >L1 OEM-receivers can program the 1PPS output to higher frequencies. A
> >prime example of a very modern receiver is the Ublox 6T receiver, that
> >have two outputs - one classic 1PPS, and a second programmable frequency
> >output. See link below:
> >
> >
> http://www.u-blox.com/images/downloads/Product_Docs/Timing_AppNote_%28GPS.G6-X-11007%29.pdf
> >
> >Good luck with your GPSDO buildproject!
> >
> >--
> >
> >   Björn
> >
> >
> >
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