[time-nuts] Shielding a DAC line

Bob Camp lists at rtty.us
Thu Sep 26 20:54:59 EDT 2013


Hi

I suspect that you have a ground offset between the OCXO's ground return and the DAC's ground reference. The signal *should* be DC, Shielding it won't hurt, but it really should not help much.  If anything is an issue a simple R/C filter at the OCXO pin should nuke it better than coax will.

Bob

On Sep 26, 2013, at 8:09 PM, Bob Stewart <bob at evoria.net> wrote:

> I made some minor hardware changes to my GPSDO today and I see that it's locked to a new DAC voltage about 21mV higher.  So, I was wondering about shielding the short run to the OCXO.  I have immediately available RG-174 and I'm putting that in.  But, should this be some sort of steel shelled semi-rigid coax?  Maybe it's a dumb question, but I thought I'd ask.
> 
> Bob - AE6RV
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