[time-nuts] FE-5680A Mechanical Question

Bob Camp lists at rtty.us
Fri Jan 13 12:32:01 EST 2012


Hi

I think it's pretty safe to guess that none of these units got reset in the
field. What ever the end application, it just let them free run. Based on
the number or "pps missing" units, I'd also bet it used the dirty 10 MHz
output rather than the pps.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chuck Forsberg WA7KGX N2469R
Sent: Friday, January 13, 2012 12:05 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question

Both of my units came with a stored preset of 0.

Giving the second unit an offset of 0 results in an
84 second period for a 360 degree phase procession
relative to a Thunderbolt's 10 MHz output.  Call it
100 instead of 84 and we get 1e-9.  Measure the
distance to the Moon within a foot or two.

On 01/12/2012 03:57 PM, EWKehren at aol.com wrote:
> Nigel
> I did not program it, it had its original setting and it is 9.99999999944
> which is -5.6 E-11, within 10 MHz which is within spec. Once I have some
> aging I  will look at Voltage sensetivity.
> Bert Kehren
>
>
> In a message dated 1/12/2012 6:22:02 P.M. Eastern Standard Time,
> GandalfG8 at aol.com writes:
>
> Hi  Bert
>
> Could you clarify something for me please, before you started your  tests
> did you program the unit to be close to 10MHz or did you leave  it as
> received,  and if so what is the actual frequency and is it  stable?
>
> regards
>
> Nigel
> GM8PZR
>
>
> In a message dated  12/01/2012 21:50:28 GMT Standard Time,
EWKehren at aol.com
>
> writes:
>
> I hear  all these ideas from paper tigers. How about  building something
> and
>
> report on it. I can do a Shera for $ 40  and add a $ 20 GPS.  And it
> works.
> I did fail to mention that I  also have retrace data. Over the test
period
> I
> had at least 10  power outages from seconds to a couple of hours.  The Rb
> goes   right back to 1 E-12. It would be nice if some one  independent
does
>
> a
> test on  aging, maybe I was lucky and got a  particularly  good unit.
> _______________________________________________
> time-nuts  mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the  instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>

-- 
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


_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.





More information about the time-nuts mailing list