The schematic provided shows two 20K resistors in series with the
varactor. So, yes there is some RC time constant. But is it enough to
filter our 100Hz or 1Khz, or 100Khz? I'll have to pull out the
calculator. The other issue, is I don't know how my OCXO is built. No
schematic.
Also, don't forget, this is time nuts. Better is better, is it not? :)
Dan
no that is not so bad, there --inside of the box is always a small RC
which takes care the RF can't get into the oscillator, just look the
oscillator circuirs
73
Alex
On 9/5/2014 10:18 AM, Dan Kemppainen wrote:
> Tom,
>
> Awesome! Thanks!
>
> "Section 2-14. Since noise on the EFC line affects the oscillator's
> stability (noise appears as FM on the output) care must be taken to
> ensure that a relatively noise free EFC..."
>
> I was thinking the Varactor had be tied to the crystal, which only makes
> sense. So, the bottom line is the EFC inputs are probably susceptible to
> HF noise...
>
> The bottom line is, it's worth while ensuring the EFC amp and EFC signal
> are as clean as possible. Good stuff to know!
>
> Thanks!
> Dan
>
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