The Cheyenne HAWK thunder is designed to work at its optimal level with the latest version of Cheyenne Power Supplies (either the PU2 or the new PU1). If you are running the thunder on either the new PU1 or the latest version of the PU2 then you do not need this cable. An integrated board in the latest versions of the PUI and PUII makes it possible to start the machine with 4-6V.

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