[time-nuts] FE-5680A Question

Bob Camp lists at rtty.us
Tue Feb 14 00:48:52 UTC 2012


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.


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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