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Path: ...!local-4.nntp.ord.giganews.com!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Mon, 27 May 2024 11:04:33 +0000 From: john larkin <jl@650pot.com> Newsgroups: sci.electronics.design Subject: Re: CO2 Funny Date: Mon, 27 May 2024 04:04:33 -0700 Message-ID: <oqo85j9g6jitrju94cv1n5894j7r45ir9e@4ax.com> References: <ionp4jpskmjj3t5ge13jtvbmg6n3g0m738@4ax.com> <mssr4jh13hf2p7deu8phdkkda50roask0p@4ax.com> <v2ktll$17293$1@dont-email.me> <o61s4jhh7krhb55lo3c40r5mn2f9nkk1n3@4ax.com> <2k9s4j94256k6gbapd5snscqosn3b53ici@4ax.com> <aebs4j5fhoja2c3q718r4l7dqh9gp28sj6@4ax.com> <v2na16$1nvei$1@dont-email.me> <v2tb6t$tve$1@nnrp.usenet.blueworldhosting.com> <v2uhs7$39s6m$1@dont-email.me> <v2vul6$1ke5$1@nnrp.usenet.blueworldhosting.com> <v314ac$3su4i$1@dont-email.me> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 53 X-Trace: sv3-yz8YyY9VOj8RXPOGvTB3P+tkTfT6QLmv22xxrOCfGZwnnjaopGkM2ZULTck8EpIKlRsSXYNwHf3PPXr!ywjOudePm7Hl3PzcpARBVLp31NptnQJyj/vYDqaIjDlzUs4lHnm2ARrF6VobSQTksERDdMNag+u0!IpnK3Q== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3716 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.