[time-nuts] Is this measurement for real?

Magnus Danielson magnus at rubidium.dyndns.org
Sun Dec 8 22:13:57 EST 2013


On 12/09/2013 03:43 AM, wb6bnq wrote:
> Hi Magnus,
>
> If the TAPR module you are referring to is the ICS-501 thing, that is
> really not suitable for this purpose.  Equally, neither are the DDS
> chips.  Besides never being right where you want them you have the
> spurii to deal with.  Way too much filtering required.  These two
> items aside from being surface mount have the added requirement of
> needing a damn cpu to tell the DDS what to do, not too mention the
> additional circuit board space.
>
> For a fixed frequency requirement it is much easier and cheaper to do
> it with a proper PLL and a good but inexpensive VCXO.  Which, by the
> way, I found a small stash of the VCXO's on the right frequency for
> $25 each from a highly reputable US manufacturer (an over stocked
> run).  And, TOO BOOT, I have the layout all done in through hole
> intended to fit in a $15 ABS EMI/RFI shielded box about 6.7 inches by
> 3.3 inches.
When you can do propper PLL with a good VCO and have the layout, then it
is a no-brainer.

Cheers,
Magnus


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