[time-nuts] Fiberoptic 10MHz link

Bob Camp lists at rtty.us
Thu Jun 3 01:01:03 UTC 2010


A <$3 RF transformer should do the trick. You can put in a couple of them if you are really concerned. 

The optical stuff will work. It's pretty expensive if you want something quiet enough to be useful. 

A jitter of 0.1 UI is considered "ok" for moving data. A 36 degree phase modulation (same thing) on your frequency standard is not going to do very well. More or less, you need a link that would do "ok" on very fast data to give you a decent frequency reference at the other end without running a clean up loop in the basement. 


On Jun 2, 2010, at 8:13 PM, <lstoskopf at cox.net> <lstoskopf at cox.net> wrote:

> I have access to my roof and above through a trap door I had installed when we built the house.  Also have AC in the attic.  I've been reluctant to put a GPS up there with a direct link to the shack and computers, etc.  Has anyone done a simple circuit for conversion from a 10 MHz signal into, say, TOSLINK or such and then back for a galvanic break?  I realize that I'll be adding some delay and jitter, but for frequency locking shouldn't be a problem.
> Looks like it isn't too big a problem to throw something together, but if it has be done......
> N0UU
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