[time-nuts] ngTADD-1

Attila Kinali attila at kinali.ch
Thu Apr 25 03:08:55 EDT 2013


On Wed, 24 Apr 2013 10:09:14 -0600
Kevin Rosenberg <kevin at rosenberg.net> wrote:

> On Apr 24, 2013, at 2:50 AM, Attila Kinali <attila at kinali.ch> wrote:
> > [...]
> > low jitter (sub 1ns rise/fall times). For the transmitters, if possible
> > go for those with laser diodes and modulate them (ie no on-off switching).
> > This will give you jitter way below 1ns (sorry, don't know any hard numbers).
> 
> For < 1ns jitter, do you have a recommendation of 
> modulation (ASK/PSK?) and carrier frequency?

Sorry, i was a bit unclear. What i meant with modulation was to
use an analog scheme that never saturates the transmitter or receiver
both in the max (fully on) or min (fully off) direction.
Ie do not send 1's and 0's as it is common in the digital domain of
networking, but an "analog" 10MHz sine. With that you get around
of the non-idealities that come with on-off transmissions.

			Attila Kinali
-- 
The trouble with you, Shev, is you don't say anything until you've saved
up a whole truckload of damned heavy brick arguments and then you dump
them all out and never look at the bleeding body mangled beneath the heap
		-- Tirin, The Dispossessed, U. Le Guin


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