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Groups > comp.sys.acorn.misc > #2968
| From | Dave Higton <davehigton@dsl.pipex.com> |
|---|---|
| Newsgroups | comp.sys.acorn.misc |
| Subject | Re: Had a bit of fun today... |
| Date | 2011-12-15 20:42 +0000 |
| Organization | Home |
| Message-ID | <8947254252.davehigton@dsl.pipex.com> (permalink) |
| References | (15 earlier) <524064308atim@invalid.org.uk> <5240661c16dave@davenoise.co.uk> <4ee6205d$0$5670$ba4acef3@reader.news.orange.fr> <5240adc42edave@davenoise.co.uk> <4ee6dff2$0$2537$ba4acef3@reader.news.orange.fr> |
In message <4ee6dff2$0$2537$ba4acef3@reader.news.orange.fr>
Rick Murray <heyrickmail-usenet@yahoo.co.uk> wrote:
> On 13/12/2011 01:21, Dave Plowman (News) wrote:
>
> > And you'd assume most broadcast equipment would be new enough
> > - or modified - to prevent this happening in all but the most
> > arduous circumstances.
>
> Indeed - shouldn't shielded wires and such mitigate this greatly?
Only if the shields are connected to earth via an appropriate route.
A classic mistake - of which I was guilty before I understood what
happens - is to connect the shield of a cable to pin 1 of a 3 pin
XLR connector and to connect pin 1 to earth inside the equipment.
The result is that all the interference picked up on the shield is
brought inside the equipment and radiated for the electronics to
pick up.
Remember the skin effect. At the frequencies we're concerned about,
the interference is conducted through one skin of any metallic
component, be it a metal case or a conductive coating of a plastic
case. The conductive skin is small compared with the thickness of
the material - even of a coat of metallic paint. The trick is to
arrange all the metalwork, shielding, and all interconnections
between them, so that interference from outside is kept on the outer
skin, and all potentially outgoing interference from inside is kept
on the inner skin.
But there can be other places where interference gets in. One I
remember was the hole for a VHS cassette. The replay amplifier
was overloaded by RF getting in through that hole. In fact any
slot can do it; the slot can be as narrow as you like. Look up
"slot antenna" for further information.
Dave
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Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-11-24 23:46 +0000
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-11-25 08:47 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-11-25 09:39 +0000
Re: Had a bit of fun today... Martin <News03@avisoft.f9.co.uk> - 2011-11-25 10:12 +0000
Re: Had a bit of fun today... Alan Griffin <ajg@argonet.co.uk> - 2011-11-25 10:23 +0000
Re: Had a bit of fun today... Grahame Parish <maillist.parish@millers-way.net> - 2011-11-25 10:57 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-11-25 11:03 +0000
Re: Had a bit of fun today... Chris <decordova@ukgateway.net> - 2011-11-26 01:03 +0100
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-11-26 11:18 +0000
Re: Had a bit of fun today... Chris Bell <news@highpath.net> - 2011-11-25 11:29 +0000
Re: Had a bit of fun today... Bryn Evans <d@a.invalid> - 2011-11-25 16:29 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-11-26 15:51 +0000
Re: Had a bit of fun today... Fred Bambrough <fred@[127.0.0.1]> - 2011-11-26 16:20 +0000
Re: Had a bit of fun today... Folderol <folderol@ukfsn.org> - 2011-11-26 16:28 +0000
Re: Had a bit of fun today... Barry Gray <barrygray@blueyonder.co.uk> - 2011-11-28 10:38 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-11-30 20:33 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-01 06:53 +0100
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-01 08:40 +0000
Re: Had a bit of fun today... Alan Calder <alan_calder@o2.co.uk> - 2011-12-01 09:17 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-01 10:15 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-12-04 07:27 +0000
Re: Had a bit of fun today... Brian Bailey <bbailey@argonet.co.uk> - 2011-12-04 07:50 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-05 15:41 +0100
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-04 11:03 +0000
Re: Had a bit of fun today... Martin <News03@avisoft.f9.co.uk> - 2011-12-04 11:44 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-04 15:26 +0000
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-12-04 19:07 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-04 21:05 +0000
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-12-04 23:36 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-05 15:49 +0100
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-12-12 10:57 +0000
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-12 11:18 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-12-12 11:47 +0000
Re: Had a bit of fun today... Brian Carroll <bric-nospam@argonet.co.uk> - 2011-12-12 12:22 +0000
Re: Had a bit of fun today... Chris Hughes <news@noonehere.co.uk> - 2011-12-12 14:19 +0000
Re: Had a bit of fun today... charles <charles@charleshope.demon.co.uk> - 2011-12-12 13:47 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-12 16:40 +0100
Re: Had a bit of fun today... charles <charles@charleshope.demon.co.uk> - 2011-12-12 15:46 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-13 05:58 +0100
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-13 00:21 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-13 06:17 +0100
Re: Had a bit of fun today... Jess <phantasm_39@hotmail.com> - 2011-12-13 09:29 +0000
Re: Had a bit of fun today... Folderol <folderol@ukfsn.org> - 2011-12-13 18:55 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-14 08:18 +0100
Re: Had a bit of fun today... Dave Higton <davehigton@dsl.pipex.com> - 2011-12-15 20:53 +0000
Re: Had a bit of fun today... Dave Higton <davehigton@dsl.pipex.com> - 2011-12-15 20:42 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-12-13 12:26 +0000
Re: Had a bit of fun today... Jess <phantasm_39@hotmail.com> - 2011-12-12 11:18 +0000
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-12-12 19:43 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-12-13 13:25 +0000
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-04 23:48 +0000
Re: Had a bit of fun today... Dr Peter Young <pnyoung@ormail.co.uk> - 2011-12-04 16:00 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-04 20:56 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-05 15:53 +0100
Re: Had a bit of fun today... M Harding <riscos@mdharding.org.uk> - 2011-12-05 15:11 +0000
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-05 15:19 +0000
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-12-05 16:51 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-05 18:40 +0100
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-12-05 18:59 +0000
Re: Had a bit of fun today... Martin Wynn <m.wynn@blueyonder.co.uk> - 2011-12-05 19:09 +0000
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-05 23:03 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-06 06:53 +0100
Re: Had a bit of fun today... Simon <simon.willcocks@t-online.de> - 2011-12-05 23:46 -0800
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-06 14:38 +0000
Re: Had a bit of fun today... Simon <simon.willcocks@t-online.de> - 2011-12-06 09:52 -0800
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-06 23:05 +0000
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-12-07 08:58 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-09 09:13 +0100
Re: Had a bit of fun today... Stuart <Spambin@argonet.co.uk> - 2011-12-06 10:06 +0000
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-06 14:40 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-12-12 11:06 +0000
Re: Had a bit of fun today... Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2011-12-06 19:56 +0000
Re: Had a bit of fun today... M Harding <riscos@mdharding.org.uk> - 2011-12-06 20:58 +0000
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-12-06 23:10 +0000
Re: Had a bit of fun today... M Harding <riscos@mdharding.org.uk> - 2011-12-07 10:24 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-12-09 09:22 +0100
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-12-12 11:09 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-05 21:14 +0000
Re: Had a bit of fun today... Chris Bell <news@highpath.net> - 2011-12-06 09:49 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-12-06 10:52 +0000
Re: Had a bit of fun today... Chris Bell <news@highpath.net> - 2011-12-06 11:47 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-11-26 16:32 +0000
Re: Had a bit of fun today... Russell Hafter News <see.sig@walkingingermany.invalid> - 2011-11-26 16:27 +0000
Re: Had a bit of fun today... Steve Fryatt <news@stevefryatt.org.uk> - 2011-11-26 16:34 +0000
Re: Had a bit of fun today... Tim Hill <tim@invalid.org.uk> - 2011-11-26 16:46 +0000
Re: Had a bit of fun today... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2011-11-27 04:56 +0100
Re: Had a bit of fun today... Brian Bailey <bbailey@argonet.co.uk> - 2011-11-29 08:23 +0000
Re: Had a bit of fun today... "Dave Plowman (News)" <dave@davenoise.co.uk> - 2011-11-29 10:54 +0000
Re: Had a bit of fun today... Brian Bailey <bbailey@argonet.co.uk> - 2011-11-29 11:55 +0000
Re: Had a bit of fun today... Brian Bailey <bbailey@argonet.co.uk> - 2011-12-01 07:24 +0000
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