[time-nuts] ngTADD-1
Bob Camp
lists at rtty.us
Tue Apr 23 22:04:32 UTC 2013
Hi
If you are "only" worried into 1 Hz or even 0.1 Hz, temperature on the coax will not be a big issue. If you are trying to maintain 170 dbc at the far end of the wire, shielding and isolation will be a *big* issue. You may need some pretty fancy cable and magnetics to make that work….
Bob
On Apr 23, 2013, at 3:49 PM, Kevin Rosenberg <kevin at rosenberg.net> wrote:
> On Apr 23, 2013, at 4:43 AM, Bob Camp <lists at rtty.us> wrote:
>> Like any design, the first question is - what's the goal?
>
> My favorite first question, too. Move my most stable OXCO in
> the 1 Hz to 10 KHz range to the more stable environment,
> and maintain its phase noise of -100 dBc/Hz @ 1 Hz and
> -170 dBc/Hz at 10 kHz.
>
> Since the cable will be inside the structure, passive insulation
> should help keep the temperature change rate < 1 degK / hr.
> Though, the HVAC does cycle the lab ambient temperature a few degrees
> K per hour.
>
> Twinax is an interesting idea, thanks.
>
> Kevin
>
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