[time-nuts] Another ThunderBolt cabling question

[Azelio Boriani]

Yes, highly recommended the differential line approach.

On Thu, Jun 14, 2012 at 6:38 PM, Chris Albertson
<albertson.chris at gmail.com>wrote:

> On Thu, Jun 14, 2012 at 3:59 AM,  <shalimr9 at gmail.com> wrote:
> > Acrually the PPS output has very low impedance, so you can probably load
> it with 5 instruments, each with 50 termination.
>
> My problem with PPS distribution was the fast raise time got "smeared"
> by the long cable.   Lots of guesses about why.  Could be reflections
> off the end, capacitance in the cable.     The problem is that I want
> WAY under 1 microsecond level performance out of a PPS signal.  The
> trouble is that the PPS is a single ended signal and the leading edge
> is defined by some voltage threshold.   So it is sensitive to noise.
>  Two solutions I found (1) differential transmitters and receivers at
> each end, like RS-422 type work, or (2) simply move the thunderbolt
> physicaly close and use an 18 inch cable.
>
> Take my word for it, the T-Bolt is not able to drive a 100 foot long
> twisted pair cable
>
>
> >
> > Not so for the 10MHz though
> >
> > Didier KO4BB
> >
> > Sent from my BlackBerry Wireless thingy while I do other things...
> >
> > -----Original Message-----
> > From: "David C. Partridge" <david.partridge at perdrix.co.uk>
> > Sender: time-nuts-bounces at febo.com
> > Date: Thu, 14 Jun 2012 01:59:42
> > To: 'Chris Wilson'<chris at chriswilson.tv>; 'Discussion of precise time
> and frequency measurement'<time-nuts at febo.com>
> > Reply-To: Discussion of precise time and frequency measurement
> >        <time-nuts at febo.com>
> > Subject: Re: [time-nuts] Another ThunderBolt cabling question
> >
> > No you can't load the 10MHz (or the PPS) with five instruments in
> parallel.  You need a distribution amplifier.
> >
> > Dave
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Chris Wilson
> > Sent: 13 June 2012 22:33
> > To: Discussion of precise time and frequency measurement
> > Subject: [time-nuts] Another ThunderBolt cabling question
> >
> >
> >
> >  13/06/2012 22:27
> >
> > About to do the permanent installation, if I bring two leads from the 10
> MHz and 1 PPS BNC sockets on the TB to a panel in my shck can i have say 5
> BNC sockets on the panel wired in parallel, with the lead from the 10 MHz
> socket on the TB feeding them all? And a single socket for the 1 PPS? Any
> need to screen the back of the socket panel, or enclose it in a metal box?
> Cheers.
> >
> > Oh, I have been running lady Heather for a while tonight, here's a
> screen capture, does it look OK, ther's suddenly just two traces appeared?
> Thanks. http://www.chriswilson.tv/heather.png
> >
> > --
> >       Best Regards,
> >                   Chris Wilson.
> > mailto: chris at chriswilson.tv
> >
> >
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>
> --
>
> Chris Albertson
> Redondo Beach, California
>
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