[Coco] Noise in repack (was Laser Cut Cartridge Case)

[Frank Swygert]

Date: Wed, 11 Sep 2013 21:05:14 -0400
From: Gene Heskett<gheskett at wdtv.com>
Subject: Re: [Coco] Laser Cut Cartridge Case (was Re: miniFLASH product)

One thing all you repackers tend to skip, is that the coco, running naked,
is one ultra noisy machine, generating huge amounts of RFI at the harmonics
of its crystal.  So any such repacking really needs to have the insides of
the case coated with a carbon/metallic film paint, connected solidly the
the ground rails of the PCB's.

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My first repack was done with a nice wood case (I am a decent carpenter!). I glued aluminum foil to the inside and ran a ground wire from the CoCo ground to the foil. Never did have any RFI problems -- it was at least as quiet as the original CoCo (I kept the foil covered board from the original case on the MB as well). I repacked so I didn't have to buy a separate enclosure for my disk drives. I was in Okinawa at the time, had ordered a couple bare 360K drives from the states.

-- 
Frank Swygert
Editor - American Motors Cars Magazine
www.amc-mag.com