Graph-tech Ghost User Manual download pdf (Page 74)

Shielded cavity caveat

To improve noise immunity, the walls of the control cavity

are sometimes shielded, either with metal foil or conductive

paint (usually grey or black). This conductive shielding can

sometimes cause problems for the ghost® system. The ghost®

boards are not coated or insulated, so they must not touch the

cavity shielding. Mounting the boards on the shielding is okay,

as long as the foam tape on the back of the Acousti-phonic

board keeps the board separated from the shielding. If you

nd it dicult to install the ghost® boards with space around

them to prevent touching the shielding, after you’ve plugged

in the pickups and all other connections, wrap the board(s) in

electrician’s tape to insulate the board from the cavity shielding.

In some instances, the cavity shielding can ironically cause

the ghost® system to pick up “buzz” or “hum” (sometimes

even radio stations)! Because it is a modular system, each

ghost® component comes with a ground wire. This abundance

of ground wires, combined with the pots and switches

being grounded through the shielding where they are

mounted, increases the likelihood of creating a ground loop.

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Graph-tech Ghost User Manual Page 74