[time-nuts] FE-5680A Question

paul swed paulswedb at gmail.com
Tue Feb 14 01:29:45 UTC 2012


The patterns simply the lead in to lock. Coming from a known position low
in frequency...
Nothing magical

On Mon, Feb 13, 2012 at 7:48 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> Some numbers:
>
> C field tuning on a Rb like an FRS or an LPRO is about 2 to 6 ppb
> DDS tuning on the "new" FE's is in the 1 to 10 ppm range (1000x larger)
> DDS tuning on the "old" FE's was about 10% without mods, much wider with
> minor tuning.
>
> Bob
>
>
>
> On Feb 13, 2012, at 2:16 PM, Erno Peres <ernieperes at aol.com> wrote:
>
> >
> > Hi Chris,
> >
> > thanks for the info. My second problem is that the unit is in locked
> position
> > after powering up.... but after about 5-8min  the freq goes down slowly
> about 9.999.997.3 Hz and the lock ind level is still low.....
> > Also noticed that during the sweep  the max freq is 10.000.004 Hz and
> the min freq is 9.999.750 Hz..
> > I assume that I have to open up the unit and try to re tune  the 10Mhz
> sweep osci...... let say  from  9.999.900  to 10.000.100 at least.
> > Any suggestion????
> >
> > Thanks and regards,
> > Ernie.
> >
> >
> >
> >
> > -----Original Message-----
> > From: Chris Albertson <albertson.chris at gmail.com>
> > To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> > Sent: Mon, Feb 13, 2012 7:32 pm
> > Subject: Re: [time-nuts] FE-5680A Question
> >
> >
> >> From the label I can see it requires +5 Volt but no info about the
> > S232.......
> > Can I adjust the " C " field from the DB9 connector....????
> > On the units that require 5V you can adjust the frequency using rs-232
> > ut only within a very small range around 10MHz.      Some of the
> > ocumentation applies to other types of this same model oscillator.
> > Chris Albertson
> > edondo Beach, California
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