[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...

Bob Camp kb8tq at n1k.org
Wed Nov 5 19:23:50 EST 2014


The ADC and the active filter next to it are present on my Ref 0 and Ref 1. I suspect that the active filter is there to allow them to dither the DAC without creating monster spurs. 


> On Nov 5, 2014, at 6:29 PM, Arthur Dent <golgarfrincham at gmail.com> wrote:
> Could someone who has both the REF 0 and REF 1 units check
> to see if the REF 0 unit has U1 missing. U1 is an AD7849
> serial input, 14-Bit/16-Bit DAC on my REF 1 units but is
> missing on an old REF 0 I just dug out of the to-do pile.
> Someone may have already mentioned this and I missed it.
> -Arthur
> http://www.analog.com/en/digital-to-analog-converters/da-converters/ad7849/products/product.html
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