[time-nuts] FE-5680A Question

paul swed paulswedb at gmail.com
Mon Feb 13 20:35:21 UTC 2012


The reason to sweep low is to establish a particular lock pattern to look
for.
Check the programmed offset before retuning. Mine was at mid range 0000
Search the threads for sending commands to the FE5680.

On Mon, Feb 13, 2012 at 2:56 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> For what ever reason, most of the FE's sweep down to about 200 to 250 Hz
> low. Few sweep more than 50 Hz high. I have one unit that locks fine and
> only sweeps 5 Hz high.
>
> Yes, I would open it up and re-tune. I think I would only bump it about 50
> Hz or so. I have no idea *why* they are all tuned low, but there may be a
> reason (like avoiding a false lock).
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Erno Peres
> Sent: Monday, February 13, 2012 2:17 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] FE-5680A Question
>
>
> 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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