From owner-freebsd-chat Tue Jul 1 17:29:47 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id RAA02651 for chat-outgoing; Tue, 1 Jul 1997 17:29:47 -0700 (PDT) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id RAA02646 for ; Tue, 1 Jul 1997 17:29:42 -0700 (PDT) Received: (from msmith@localhost) by genesis.atrad.adelaide.edu.au (8.8.5/8.7.3) id JAA03515; Wed, 2 Jul 1997 09:58:01 +0930 (CST) From: Michael Smith Message-Id: <199707020028.JAA03515@genesis.atrad.adelaide.edu.au> Subject: Re: Monitor shadows? In-Reply-To: <19970701105905.OS62513@uriah.heep.sax.de> from J Wunsch at "Jul 1, 97 10:59:05 am" To: joerg_wunsch@uriah.heep.sax.de Date: Wed, 2 Jul 1997 09:58:00 +0930 (CST) Cc: chat@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-chat@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk J Wunsch stands accused of saying: > As Michael Smith wrote: > > > You can move microwave down a twisted pair, as long as it's carefully laid > > out; the same goes anywhere else really. > > Sure, but for a Sub-D connector with its totally ``weird'' geometric > layout, how would you ensure a uniform impedance? I think you can > only ensure the latter for a uniform geometric layout, where the ratio > between conductor diameter and dielectricum thickness is constant. In the same way you do for any other low-loss connector I guess, make the geometry change gradual, not sudden, and choose your dielectric to suitg. FWIW, some of the RF gear we've integrated with has run 100MHz+ signals through D connectors; we were appalled to begin with too, but the RF people looked at us (the digital/software people) like we were nuts, so I have to assume it can be done 8) > Good that there's no topic off-topic enough in a -chat list. :-) *grins* -- ]] Mike Smith, Software Engineer msmith@gsoft.com.au [[ ]] Genesis Software genesis@gsoft.com.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control. (ph) +61-8-8267-3493 [[ ]] Unix hardware collector. "Where are your PEZ?" The Tick [[