[time-nuts] Have I wrecked my FE-5680A?

Tim Shoppa tshoppa at gmail.com
Fri Apr 29 08:54:01 EDT 2016


EEPROM endurance? Tendency for EEPROM to get corrupted when written to just
after power-up?

See https://www.febo.com/pipermail/time-nuts/2014-October/087324.html

Tim N3QE

On Fri, Apr 29, 2016 at 7:11 AM, Bert Kehren via time-nuts <
time-nuts at febo.com> wrote:

> Sadly yes
> The reason we have not released our GPSDO for the FE5690/50 and FE405 is
> that we have experienced the same on all three devices. You are the 9th
> case
> that I know of. We know very little as to what exactly causes it but we are
>  incorporating circuitry to prevent it. What we know is that it is not a
> particular code sequence on the RS232 port, but what happens the operating
> code  is turning to mush. Some how the RS port is involved. Serious flaw on
> all  FE devices since most likely the code was written by the same
> individual.
> Bert Kehren
>
>
> In a message dated 4/28/2016 9:02:28 P.M. Eastern Daylight Time,
> time-nuts at febo.com writes:
>
> Just as I  started testing the GPS discipline board prototype, my FE-5680A
> seems to have  developed a very odd problem.
>
> If I give it power, it outputs a “kinda”  10 MHz sine wave while it sweeps
> around looking for a physics lock. This is as  expected.
>
> About the time that I would expect the lock light to turn on,  instead the
> output just stops. The lock light never comes on.
>
> This  unit’s been working fine for months now. It’s conceivable that I’ve
> sent it  some sort of serial command it couldn’t digest, but using the
> Windows  calibrator software seems to work - albeit there not being any
> output
> from the  oscillator at  all.
>
>
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