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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: CO2 Funny
Date: Mon, 27 May 2024 04:04:33 -0700
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On Mon, 27 May 2024 15:05:14 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:

>On 27/05/2024 4:22 am, Edward Rawde wrote:
>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:v2uhs7$39s6m$1@dont-email.me...
>>> On 26/05/2024 4:38 am, Edward Rawde wrote:
>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:v2na16$1nvei$1@dont-email.me...
>>>>> On 23/05/2024 3:52 am, john larkin wrote:
>>>>>> On Wed, 22 May 2024 18:10:58 +0100, Pomegranate Bastard <pommyB@aol.com> wrote:
>
><snip>
>
>>> It usually takes a while to work out why they did it that way, and it's pretty much essential to spend that time before you start
>>> fiddling with the circuit. That wasn't true of the guy who'd put in the 741. He was very much in the John Larkin "if it sort of
>>> works, ship it" camp.
>> 
>> Which of John Larkin's products have you purchased and tested and what improvement
>> do you think should have been made before it was shipped?
>
>Absolutely none of them. The timing gear he sells to the American 
>National Ignition Facility is based on a 1978 Hewlett Packard scheme,
>written up in their journal, and it depends on starting up a 50MHz 
>free-running oscillator in a very predictable way.

Totally wrong, as usual. The NIF timing system is synchronous at
155.52 MHz across over 200 timing modules, about 2000 "clients"
triggered every shot.

https://highlandtechnology.com/Product/V880

https://www.dropbox.com/scl/fi/74f60yne8cdlr53n1x1la/TUAP069.pdf?rlkey=4lp86ca0ztfuh055qyxtok9lm&dl=0

>
>Faster oscillators have less jitter, and while synchronising to a 
>continuously running faster oscillator twice may introduce extra jitter, 
>the net jitter on the time delay can be quite a bit less.

We deliver 1 ps timing resolution and a few ps RMS jitter to clients
across a facility the size of a football stadium.

We recently delivered our third system to NIF, the second generation
beamline amplitude modulators. This helped them achieve over-unity
fusion yield.

>
>I had much the same problem in 1988 and went for a free-running 800MHz 
>oscillator.
>
>It turns out that the first version of John's 50MHz oscillator had a 
>nasty - if small - sub-harmonic oscillation and he's finally found a 
>better version.

It did not.