[time-nuts] FE-405B Reprogramming

Bob Camp kb8tq at n1k.org
Wed Jun 8 18:06:26 EDT 2016


The 405 appears to have some “bandpass” elements in it. You can not tune it over a wide range.


> On Jun 8, 2016, at 3:08 PM, Logan Cummings <logan.cummings at gmail.com> wrote:
> Hi All,
>    Nick's request for a divide-by-three circuit to get his FE-405B to
> output a 10MHz signal got me thinking - didn't want to threadjack.
>    I had assumed that the FE-405B's DDS output and FE-5680 compatibility
> made it a good candidate for output frequency reprogramming. Has anyone
> determined that this is not possible? My biggest concern was that if the
> internal crystal is also at 10MHz you'd get bad spurs trying to output the
> DDS at the same frequency..
>    Does anyone know if the FE-405B uses the original FE-5680 DDS circuit
> or the more recent one that is only narrowly (EFC) tunable over the serial
> interface? Would be great to have a stable reference at 1, 5, 10, etc. MHz.
>     Any info/references on the FE-XXX internals would be appreciated!
> Thanks,
> -Logan
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