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

Nick Sayer nsayer at kfu.com
Fri Apr 29 21:25:24 UTC 2016


> On Apr 29, 2016, at 12:07 PM, Chuck Harris <cfharris at erols.com> wrote:
> 
> We have to sort of conclude that the failure is either
> caused by bad data getting stored, or some sort of overflow
> error.
> 
> It really is pretty unlikely that the firmware has been
> changed, unless you happened to accidentally start a
> flash burn routine, and it wasn't qualifying packets
> properly.
> 
> If it isn't an overrun, or overflow error, then I would
> suspect what you are sending to the port.  I have worked
> with guys that are totally flustered when doing firmware
> for devices that should qualify the data they receive.
> When they don't know what to do (or are too lazy to try
> and figure out the right thing to do) they simply stub
> out the error path and go on.  Yuck!
> 
> If you have been sending an ill formed packet, you best
> stop doing that ;-)

Oh, yeah, that’s fixed. While I’m waiting for a replacement 5680A my plan of record is to try and create a simulacrum out of an xCXO (the AVR of my board is clocked from the oscillator, so it won’t work without getting 10 MHz from something) and a serial port to make absolutely sure the data is correct before trying again.





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