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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Holes\s+vs\.\s+screen\s+for\s+chassis\s+ventilation\?\s*$/: 11 ]

Total 11 documents matching your query.

1. [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: Dan Levin <dan@andlev.com>; Date: Tue, 5 Oct 2010 20:24:51 -0700; Am building an HF amp, and will need several large (~3" diameter) openings in the chassis for ventilation. I would like the chassis to be as RF tight as is reasonably possible, so trying to figure ou; /archives//html/Amps/2010-10/msg00038.html (7,284 bytes)
2. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Tue, 5 Oct 2010 21:11:08 -0700; I use hardware cloth. About 3/16" between the wires. Available in many sizes. Its usually galvanized. Available at most hardware and home centers. In other words, window screen with large holes. It's; /archives//html/Amps/2010-10/msg00040.html (9,339 bytes)
3. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: TexasRF@aol.com; Date: Wed, 6 Oct 2010 08:45:30 EDT; Hi Dan, there are a couple of data points on this: hole size in the section dealing with rfi and shielding considerations. ventilation; not screen. Any rf leakage is apparently very small or we would; /archives//html/Amps/2010-10/msg00045.html (9,475 bytes)
4. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Wed, 06 Oct 2010 08:54:51 -0400; /*snip*/ Small hole hardware cloth and bolts with fender washers on the inside. -- Ron KA4INM - _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont; /archives//html/Amps/2010-10/msg00046.html (8,190 bytes)
5. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Wed, 6 Oct 2010 09:05:23 -0400; Not Every Commercial amp uses perforated holes. I had a large Henry Rack Mount amp built for me on 220mHz and it had screen above the tube (3cx800a7) on the exhaust. Screen looked like about .2" spac; /archives//html/Amps/2010-10/msg00048.html (11,141 bytes)
6. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 6 Oct 2010 09:09:13 -0400; Hardware cloth is fine for a HF amp, use screen for VHF and up. I used a UHF GDO to sniff the RF from the 1500W 2M amp. Using hardware cloth I could see some 144 energy and a LOT of the 3rd harmonic.; /archives//html/Amps/2010-10/msg00049.html (9,605 bytes)
7. [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Wed, 6 Oct 2010 09:39:58 -0600; For high power HF and VHF amplifiers where I need to pass air through a hole, I have been using copper hardware cloth, sold by McMaster Carr, instead of aluminum screening. It is made from heavy copp; /archives//html/Amps/2010-10/msg00054.html (8,755 bytes)
8. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Wed, 6 Oct 2010 11:11:10 -0500; ISTR someone selling, or at least advertising, silver plated copper mesh on one of the ham-related mailing lists, or possibly in one of the newsgroups, before my IDE controller died wiping out two ha; /archives//html/Amps/2010-10/msg00055.html (9,750 bytes)
9. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 06 Oct 2010 10:04:14 -0700; There is a detailed set of relatively simple design equations for the relationship between hole size and RF leakage vs frequency in all versions of Henry Ott's excellent texts on EMC. I'm working wit; /archives//html/Amps/2010-10/msg00058.html (8,956 bytes)
10. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: Jim Barber <audioguy@charter.net>; Date: Wed, 06 Oct 2010 11:19:13 -0700; Thanks for the referral. Just ordered a copy from Amazon. For the group, does anyone have a well-maintained booklist for amps and general RF engineering? I recently dumped 30 years worth of Newark, A; /archives//html/Amps/2010-10/msg00060.html (9,885 bytes)
11. Re: [Amps] Holes vs. screen for chassis ventilation? (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Wed, 6 Oct 2010 13:52:32 -0500; I run a Centurion on AM with the expansion steel over the RF deck side exhaust, and over another hole cut in the top over the tank circuit. I am interested in what is motivating the desire for shield; /archives//html/Amps/2010-10/msg00062.html (8,747 bytes)

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