[time-nuts] FE-5680 frequency jump

EB4APL eb4apl at cembreros.jazztel.es
Sat Apr 6 00:22:05 UTC 2013


Thank you for the info, I used to attach a magnetic mount surface 
thermometer to my FRS-C to check its operating temperature after 
installing it in a box.  I think it is time to power it up and after 
some days check it against the GPS.

Regards,
Ignacio EB4APL


On 05/04/2013 20:59, Bob Quenelle wrote:
> I found the cause of the 4 mHz  frequency jump.  I have an LPRO-101, an
> FE-5680, power supplies and a Motorola M12T GPS board in a surplus case.
> When I put the case away to work on another project I piled the hockey
> puck antenna and lead in the case and it happened to land on the
> FE-5680.  I noticed the antenna stuck firmly to the FE-5680 case when I
> got the project back out.  I found I could get a 6 mHz (0.6 ppb) shift
> comparing the frequency with residual magnetism from the magnet stuck on
> the FE-5680 case to the frequency after demagnetizing the FE-5680 case.
> Unintentional C field adjustment.  Dope slap, live and learn.
> Bob
>



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