[time-nuts] Determination of the placement of the first pps
J. L. Trantham
jltran at att.net
Tue Jan 24 19:07:01 UTC 2012
Magnus,
How did you 'jump' the PPS on the FE-5680A? Is it a serial command? How do
you 'sync' it to the external PPS from say a TBolt?
Joe
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Magnus Danielson
Sent: Tuesday, January 24, 2012 12:51 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Determination of the placement of the first pps
On 01/24/2012 12:42 PM, J. L. Trantham wrote:
> Thanks Chris.
>
> It seems such a logical feature to have, I would think it would have
> been included perhaps by a serial command. My old CS clocks have this
> feature though I have never taken the time to sync them.
"Jumping" the PPS into about the right phase is done within a second and is
well worth the effort. I use this myself and it works well.
Forcing "sync" on atomic clocks is badly needed. The frequency steering
range is small so frequency limit sideways would take ages.
Cheers,
Magnus
> Joe
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> On Behalf Of Chris Albertson
> Sent: Tuesday, January 24, 2012 12:34 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Determination of the placement of the first
> pps
>
>
> On Mon, Jan 23, 2012 at 5:50 PM, J. L. Trantham<jltran at att.net> wrote:
>> Is this, in any way, related to the fact the Earth has a Moon?
>>
>> is there a way to
>> 'sync' the 1 PPS output of an FE-5680A to an external signal, such as
>> a GPS receiver or TBolt? I would think that might be possible given
>> their original purpose.
>
> The 1PPS is not in the units specs. It is just by luck that it works.
> However we could adjust the phase of the 1PPS by running the unit
> fast or slow for some period of time and then going back to exact
> 10MHz. But that method could take a LONG time, like tens of thousands
> of seconds. Better I think to test the phase and if it is "off" by
> more than say, 0.01 second to just power the unit off and restart and
> see what luck gives you. I bet 100 power cycles is faster than
> moving the phase by 0.5 seconds.
>
> Maybe the answer is to wire up a few decade divers and divide the
> 10MHz to 1pps yourself. Thenyou can let a known good PPS reset your
> counters and get the phase correct instantly
>
>
>
>
>
>
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