[time-nuts] [Fwd: Re: Thunderbolt PS]

Björn Gabrielsson bg at lysator.liu.se
Fri Jun 13 17:47:13 EDT 2008

On Fri, 2008-06-13 at 19:31 +0100, paul at greenrover.demon.co.uk wrote:

Hi Paul,

> Interesting work posted here about phase noise and how the psu affects
> this, I have a couple of questions while I'm planning the supply -
> First, which rail affected the noise component most?

Interesting question.

> Second, what current does the unit draw from each of the rails?


> My Symetricon splitter takes the gps antenna supply 5v from the receiver
> in my ntp server so normally the feed from the  thunderbolt wont have
> any load so I'd be particularly interested to know how much current at
> 5v is needed with no antenna connected.

The antenna I use wants less than 39mA at (2.5 to 24)VDC. So the antenna
draw at 5V is usually a small part of the total 5V power usage.



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