[time-nuts] FE-5680A arrived

[Chuck Forsberg WA7KGX N2469R]

The FE-5680A 1pps is not sync'd to UTC.
According to my calculations, it would take several hours
to walk the 1pps to UTC given the 3.8e-5 adjustment
range via the RS232 input.  A thunderbolt, an arduino,
and patience.

On 01/11/2012 09:50 AM, Chris Albertson wrote:
> On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp<lists at rtty.us>  wrote:
>> Hi
>>
>> A good old logic probe can come in handy from time to time. They certainly
>> aren't very expensive.
> On my FE5680 I was convinced there was no PPS.  My HP5328 counter
> could not find a pulse.    All I saw was high frequency noise on the
> scope.  And the spec listed pin-6 as "N/C".  Then I thought to amplify
> and low pass filter and now the PPS shows up on the HP5328 with a
> 1000000.0 uS period.
>
> I think the PPS is there but needs a bit a signal conditioning to be
> useful.  Fortunately my old Tek 465B scope has a low pass function and
> a vertical amplifier output BNC on the rear.  I had to crank the amp
> up and attenuate it on the counter.
>
> Has anyone been able to put the PPS fronmthe FE5680 to practical use
> yet.  For example sending it to a computer to drive an NTP server?
> Detecting it is one thing. reliable use 24x7 is another thing.
>
>
> Chris Albertson
> Redondo Beach, California
>
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-- 
Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430